View allAll Photos Tagged DeepSkyStacker
An image of the Double Cluster in Perseus taken this evening with a ZWOASI183MC Pro camera attached to a Celestron C6-N reflecting telescope. 36 thirty second images were stacked with DeepSkyStacker and processed with Adobe Lightroom.
Here's Comet C/2013 US10 (Catalina) above Alpha Centauri at about 8pm last night. At the moment it is gliding through the Milky Way starfields in the southern constellation Circinus. This untracked image is a 22 x 4 sec exposures taken with a Canon 6D and 70-200mm lens at f/4 and 21800 iso, stacked using DeepSkyStacker and processed in Lightroom 5.
Equipment
Imaging Telescopes Or Lenses
GSO 8" f/5 Imaging Newtonian
Imaging Cameras
ZWO ASI 183 MM PRO
Mounts
Sky-Watcher NEQ6-Pro
Filters
Baader Ha 1.25" 7nm · Baader Planetarium O3 1.25" 8.5nm
Accessories
TSOptics TS Off Axis Guider - 9mm · Pal Gyulai GPU Aplanatic Koma Korrector 4-element
Software
Luc Coiffier DeepSkyStacker (DSS) · PHD2 Guiding · PhotoShop CS5 · FitsWork 4 · CCDCiel
Guiding Telescopes Or Lenses
GSO 8" f/5 Imaging Newtonian
Guiding Cameras
Astrolumina Alccd5L-IIc
Acquisition details
Dates:
Feb. 20, 2021
Frames:
Baader Ha 1.25" 7nm: 17x300" (1h 25') (gain: 200.00) -20°C bin 1x1
Baader Planetarium O3 1.25" 8.5nm: 15x300" (1h 15') (gain: 200.00) -20°C bin 1x1
Integration:
2h 40'
Processed on a laptop... so it may need some adjustments!
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The Andromeda Galaxy (M31). This is almost the full frame of the Canon 5D Mark II using a William Optics Flourostar 110 telescope (it's 770 mm and effectively f/7),.iOptron ZEQ25 Mount; Canon 5D Mk II @ 6400 ISO, 30 seconds x 50 photos; Bahtinov mask for focusing.
[20131205_DARC_II]
GSO 10" f/4 Newtonian on CEM60,SX Trius pro 694,filterwheel and OAG with Baader MPCC coma corrector.
4x900sec Ha,4x900sec OIII
both sets stacked in Deepskystacker,BiColour (Ha,OIII,OIII) assembled and processed in Photoshop using Annie's action tools.
Taken early hours 21/07/16
Following comments made by Jean Jacquinot on my last iteration of this thing, a committee meeting was convened, and the man from the frozen north agreed that some detail had been lost. It was decided that a reprocess was in order, and this has now been actioned. Above is the result :)
Does Flickr sharpen images when you upload them? It certainly seems to. Anyway, a full reprocess, colour tweaked in places, etc. etc. Better I think. Thanks to Jean for pointing out my previous oversight :)
Last iteration here, for comparison.
I now regard the horsey in the same light as Andromeda, so I'll say goodbye to it until next year :)
RGB (Moi):
SW ED80/EQ5
Nikon D70 modded, Baader Neodymium filter
45 x 180secs iso 800, 60 x 180secs iso 640 (5 hours 15 minutes)
Guiding (RA only): Quickcam Pro4000/9x50 finderscope, PHD
Stacked in DSS and processed in CS5
Ha (Dave Williams):
15 x 600secs (2 hours 30 minutes)
Used Hasselblad 250mm f4 lens at f4 (cropped - quite a bit!)
Moravian G2 8300
Astrodon 5nm Ha filter
Takahashi EM200 mount
Guiding: DMK through an old 100mm M42 lens
Sadr Region or Gamma Cygni.
Camera: Canon 4Ti modified.
Telescope: Orion 80mm ED
Exposure time: approx 1hr 30 mins
Each 7 minutes exposure, stacked using DeepSkyStacker. Final processing on PhotoShop CS.
Nikon d90(mod)
Nikkor 80-200mm f2.8
settings: 125mm, f4, iso400
2 panels of 4hrs each, 300 seconds subs
guiding:
ZWO asi120mcs
TS 50mm guidescope
Tracking: Skywatcher Star Adventurer
software:
guiding: phd2
Stacking: Deepskystacker 4.2.2
Processing: Adobe Photoshop, GradientXterminator, Nik software, HLVG
The Pleiades and the Vulture Head Nebula
H-alpha modified Canon EOS R with William Optics RedCat 51 on iOptron Skyguider Pro; 60 images, 90s each, stacked in DeepSkyStacker (darks, flats and bias frames, unguided).
Right, I'm officially sick to death of Andromeda! This is now 16 hours of varying sub-lengths and ISO settings, and I've reached the point where my skies are going to yield no more. Quite depressing to think that 16 hours here produces the same result as perhaps an hour under dark skies - so this is my final attempt ;) (Wrong!). Better processing than the last shocking effort I think - a little more subtle, and some fainter detail evident (and some detail less evident as the contrast has been turned down a bit!)
Having spent a fortnight thinking about very little else, I can now get on with my life :)
SW ED80/EQ5
Nikon D70 modded, Baader Neodymium filter
16 hours of 4 - 12 minute subs @ ISO 640 - 1600
Guiding: Quickcam Pro4000/9x50 finderscope, PHD
Stacked in DSS and processed in CS5
Yet another clear night - whatever next?! :)
I did another 4 hours on M33 last night, only to discover at the end that the dew band wasn't working - 4 hours wasted, more or less. Not to be deterred, and with Orion waving at me invitingly, I had a go at good ol' long face. The ED80 works miracles on this, compared to the 200p :)
SW ED80/EQ5
Nikon D70 modded, Baader Neodymium filter
45 x 180secs iso 800 (2 hours 15 minutes)
Guiding (RA only): Quickcam Pro4000/9x50 finderscope, PHD
Stacked in DSS and processed in CS5
The Lagoon and Trifid Nebula in the constellation Sagittarius.
Captured with the STC Duo Narrowband Filter. Love this filter!
Stellarvue 80mm refractor
Nikon D810
DeepSkyStacker
Pixinsight
Adobe Lightroom
15x180sec subs
5 dark frames
Nuova elaborazione di M42.
New processing of M42, unguided (no HDR).
220 Sub - 25" @ 1600 Iso Eos 450d (Rebel XSi)
30 dark frames
Unguided
Celestron 8 f/6,3 (Lumicon easy guider as focal reducer)
Spikes obtained using a fishing line in some exposures.
Published on "The Digital Visual" - "The week in reader photos, december 18 2011"
thedigitalvisual.com/the-week-in-reader-photos-december-1...
A heavily cropped image again. 20 x 2-minute exposures, ISO 3200, f/4 taken 29 March 2020; 11 x 5-minute exposures, ISO 1600, f/4, taken 23 March 2014. Modified EOS 600D & Revelation 12" Newtonian f/4 reflector telescope.
Frames registered and stacked in DeepSkyStacker software; curves adjusted in Canon Photo Professional; noise reduction in CyberLink PhotoDirector.
Messier 67 is an open cluster in the constellation Cancer. This open cluster was photographed on March 9, 2015 using ten one-minute exposures using my standard astrophotography setup.
The images were "stacked" together using the software package DeepSkyStacker. The final image was edited using Corel PaintshopPro software.
The open cluster, at the time of this writing, was located near the planet Jupiter and the Beehive Cluster (Messier 44). At magnitude 6.1, you will need a pair of binoculars to see this ancient open star cluster.
Additional info can and links can be found on leisurelyscientist.com
Combined exposure: 6h 42min.
Stacked frames - Lights:412, Darks:51, Flats:60, Bias:52
Gear: Skywatcher AC 80/400 StarTravel + CLS DeepSky Filter. Pentax K-50.
Software: DeepSkyStacker, StarTools ja Photoshop.
I haven't had a chance this summer to photograph my favourite astronomical subject. So, when the conditions called for clear skies, no moon, early end to twilight and a rural location my Muse beckoned.
3h di integrazione sotto un cielo urbano pieno di inquinamento luminoso. Elaborazione con deep sky stacker, pixinsight, ph cs6
maging telescopes or lenses: Sky-Watcher Equinox 80ED
Imaging cameras: QHY8L
Mounts: Skywatcher AZ EQ6 GT
Guiding telescopes or lenses: Celestron 102mm f/6.6 Achromat
Guiding cameras: Magzero MZ-5m
Software: DeepSkyStacker, photoshop, Absoft Neat Image
Accessories: TecnoSky Flattener 1x
Resolution: 3034x2030
Dates: Aug. 18, 2015, Aug. 19, 2015, Aug. 20, 2015
Frames: 58x600" -15C bin 1x1
Integration: 9.7 hours
Darks: ~18
Flats: ~21
Bias: ~18
Avg. Moon age: 3.94 days
Avg. Moon phase: 16.95%
Bortle Dark-Sky Scale: 2.00
Temperature: 30.00
RA center: 10.660 degrees
DEC center: 41.225 degrees
Orientation: -87.969 degrees
Field radius: 1.637 degrees
I finally got a few clear nights to try out the new scope. This is hydrogen alpha data shot over 4 nights from my home observatory. RGB data will hopefully be finished this week.
Details:
40 x 900 seconds (10 hours), ISO 800
100 darks, 200 bias
Equipment: Canon 450D (full spectrum modified), Astronomik 12nm HA, Explore Scientific 80mm APO @ f.4.8, 384mm, Televue 0.8x Reducer/Flattener, Orion Atlas EQ-G
Calibrated with DeepSkyStacker, Processed in Pixinsight
This is a view of IC 1795 - The Fish Head Nebula, and is part of a huge star forming system of gas and dust located along the Perseus spiral arm of our Milky Way galaxy. The nebula is located in the constellation Cassiopeia approximately 6000 light-years from the Earth and is adjacent to the much larger Heart Nebula. This image was designed around the Hubble Palette of colors, splitting my image into artificial Sulfur II, Hydrogen Alpha, and Oxygen III channels. The image was then reassembled giving these hues that are typical of images from the HST.
Tech Specs: Sky-Watcher Esprit 120ED Telescope, ZWO ASI2600MC + Optolong L-eXtreme glass filter, running at 0F, 41 x 300 second exposures, Sky-Watcher EQ6R-Pro pier mounted, ZWO EAF and ASIAir Pro, processed in PixInsight. Image Date: September 16, 2023. Location: The Dark Side Observatory (W59), Weatherly, PA, USA (Bortle Class 4).
Rio Rancho NM Bortle 5 zone -- from my balcony
October 17-20 2021
William Optics Redcat 51
ZWO 183mc pro
ZWO 30mm f/4 mini guide scope and ZWO 120 Mini
Optolong L-eNhance filter
ZWO ASI Air Pro
Sky-Watcher HEQ5
106 X 180s lights ; with darks bias dithering
Gain 111 at -10C
Processed in DSS and PS
Used my 150mm f7 ed apo triplet and 1000D dslr with UHC filter to capture 10 subs at 5 minutes apiece at ISO 1600. Stacked and dark frame calibrated in Deepskystacker and processed in Photoshop.
Image taken early hours 5/11/16
Total 1hr
LRGB 15x60s (binned 2x2)
Stacked in DeepSkyStacker & processed in PS2.
Camera: Atik 314L+ Mono
Filters: Baader LRGB.
Scope: Sky-Watcher Equinox 80ED .
Mount: AZ EQ6-GT goto.
Imaging telescope or lens:Altair Astro 72edf deluxe
Imaging camera:Pentax K-5
Mount:iOptron SkyGuider Pro
Guiding telescope or lens:QHYCCD miniGuideScope
Guiding camera:QHYCCD QHY5II-L
Focal reducer:Hotech SCA Field Flattener
Software:DeepSkyStacker 4.1.1, Pleaides Astrophoto PixInsight 1.8 Ripley
Frames:
55x120" ISO800
Integration: 1.8 hours
Darks: ~54
Flats: ~58
Flat darks: ~51
Bias: ~46
Also known has the Whale galaxy.
Just above the Whale can be seen a small elliptical galaxy, designated NGC 4627.
To the lower left can be seen NGC 4657 also known as the Hockey Stick galaxy.
The whale galaxy lies approx 25 million light years away in the constellation of Canes Venatici.
Boring techie bit:
Skywatcher quattro 8" S & f4 aplanatic coma corrector
HEQ5 pro mount guided with an Altair 50mm & GPcam setup
Canon 450D astro modded with Astronomik CLS CCD EOS APS-C clip filter. Neewer Intervalometer used to control the exposures.
Processed with Deep Sky Stacker & StarTools.
Taken on the 25th from my yard with my D7000 mounted on a Vixen Polarie for tracking. This is the autosave stack of 5 images in DeepSkyStacker edited in ACR & PS CC 2020 with Astronomy Tools actions of Space Noise Reduction & Deep Space Noise reduction. Shot at 2000 ISO at 30, 45 seconds. Nikon D7000 at f3.5 and 18mm.
Comet NEOWISE
C/2020 F3 (NEOWISE) or Comet NEOWISE is a long period comet with a near-parabolic orbit discovered on March 27, 2020, by astronomers during the NEOWISE mission of the Wide-field Infrared Survey Explorer (WISE) space telescope. At that time, it was an 18th-magnitude object, located 2 AU (300 million km; 190 million mi) away from the Sun and 1.7 AU (250 million km; 160 million mi) away from Earth.[3]
By July 2020, it was bright enough to be visible to the naked eye. It is one of the brightest comets in the northern hemisphere since Comet Hale–Bopp in 1997 and was widely observed as being clearly visible with the naked eye. Under dark skies, it can be clearly seen with the naked eye[4] and might remain visible to the naked eye throughout most of July 2020,[5] at least until July 23, the point of the comet's closest approach to Earth. Prior to that date, the comet will be getting closer to Earth as it moves farther away from the Sun. As of July 18, the comet was about magnitude 3.[6] Binoculars are required near urban areas to locate the comet.
Source: en.wikipedia.org/wiki/C/2020_F3_(NEOWISE)
Click HERE for more astrophotography and details! ;)
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Globular Cluster Messier 62 (M62 or NGC 6266) is a cluster that can be found in the constellation of Ophiuchus. This cluster was photographed in July 16, 2015 nd the final image is a stack of 18 thirty second exposures at ISO 3200 using a Canon 6D at prime focus of a Celestron 6" telescope. The imaging system was mounted on an iOptron ZEQ25 equatorial mount. M62 lies at a distance of about 22,500 light-years. Software used to create this image include DeepSkyStacker (for stacking the individual frames), ImagePlus (for initial stretching and post processing), and Corel Paintshop Pro X5 for the final image adjustments.
The bright star just off-center is Polaris, which is surrounded by Integrated Flux Nebulae (IFN) named the Polaris Flare, discovered in 1984 by Heiles (Panopoulou et al. 2015: doi.org/10.1093/mnras/stv1301). Yildun, the brightest star in the lower right-hand corner, is the next star in the 'handle' of the Little Dipper.
Acquisition details: Fujifilm X-T10, Samyang 135mm f/2.0 ED UMC @ f2.0, ISO 1600, 78 x 60 sec, tracking with iOptron SkyTracker Pro, stacking with DeepSkyStacker, editing with Astro Pixel Processor and GIMP, taken on Apr. 11, 2020 under Bortle 2/3 skies.
The Pinwheel Galaxy (also known as Messier 101, M101 or NGC 5457) is a face-on spiral galaxy 21 million light-years (6.4 megaparsecs) away from Earth in the constellation Ursa Major. It was discovered by Pierre Méchain in 1781 and was communicated that year to Charles Messier, who verified its position for inclusion in the Messier Catalogue as one of its final entries.
On August 24, 2011, a Type Ia supernova, SN 2011fe, was discovered in M101.
Telescope : T120 (www.obs-hp.fr/guide/t120.shtml)
Camera : Andor iKon-L 936 (www.obs-hp.fr/guide/camera-120/camera-120.shtml)
Filters : UBVRI Filter Set (www.obs-hp.fr/guide/camera-120/ubvri.shtml)
Acquisition :
Lights : RGB, total ~15min
Darks : no darks
Flats : 25 flats for each color
Bias : 25
Software :
Pre-processing : DeepSkyStacker
Processing : Siril, Pixinsight
Post-processing : Lightroom, Photoshop
Second attempt with deep sky astrophotography ... I am happy with the results!
Andromeda Galaxy
M31, Messier 31, NGC 224
Date: 10/08/2019
Location: Aras de los Olmos (39°55'08.2"N 1°07'19.4"W)
Bortle class 3
IMAGE
- 61 Lights at 400mm, ISO 10000, 13s, f5.6
- 23 Darks at ISO 10000, 13s, f5.6
- Total time of exposition 11m 42s (54 frames)
HARDWARE
- Tracker Sky-Watcher AZ-GTi in EQ-Mode
- Sony ILC3-A7M3 with Sony FE 100-400mm F4.5-5.6 GM OSS
SOFTWARE
- Stellarium Scope & Stellarium to guide the tracker
- Stacking with DeepSkyStacker
- Image Stretching with the rnc-color-stretch algorithm by Roger N. Clark (ClarkVision.com), GUI RNCColorStretch 0.3 by Vincent Duparc and Davinci 2.18 from Arizona State U. (davinci.asu.edu)
- Image processing with Adobe Camera Raw and Adobe Photoshop CC
©2019 All rights reserved. MSB.photography
Thank all for your visit and awards.
The California Nebula at 135mm 📷
Just 30 x 90-seconds at ISO 800
You can't beat capturing a full-color image in an hour (set-up time included!)
I love the FOV the Rokinon 135mm provides (thank you again to everyone that recommended it)!
This was a quick setup when the clouds parted for 2 brief hours last week (snowing now). I spent longer processing the image than acquiring it 😆
Gear Information 👩🚀
Sky-Watcher Star Adventurer Pro: bit.ly/2Io0wET
Canon EOS 60Da: bit.ly/2HvzHhH
Astronomik CLS-CCD Filter: bit.ly/2PWxi4T
Rokinon 135mm F/2: bit.ly/2oq2sWF
DeepSkyStacker
Photoshop CC
Total exposure : 40 min
Nikon 5600
Nikkor 50 mm f1.8 @f2.8
Ioptron skyguider pro
Location : Kerala,India
4 hours integration on a small group of galaxies about 35 million light-years away known as the Leo Triplet. M65 M66 and NGC3628.
All data captured from my Bortle scale 5 garden in South Cambridgeshire, using a small refracting telescope and a modified Canon DSLR camera.
This was a touch image to process but I'm reasonably happy with the end result.
Comments welcome, thanks, Ed
Acquisition Equipment
Camera - CANON EOS 60D (Mod)
Filter - Astronomik CLS-CCD EOS Clip
Telescope - SkyWatcher 80ED
Reducer/Flattener - 0.85x
Focal Length - 510mm
F Ratio - F6.3
Mount - Celestron CG-5 Adv GT GEM
Guide Scope - Celestron 9x50
Guide Camera - QHY 5 Mono
Image Capture
81 x 180 sec = 4Hrs 3Mins
150 x Dark frames
200 x Bias frames
150 x Flat frames
150 x Dark Flat frames
Acquisition Software
Capture/Sequence - N.I.N.A.
Plate Solving - ASTAP
Guiding - PHD2
Planetarium - Stellarium
Processing Software
Stacking - DeepSkyStacker
Post - Adobe Photoshop / Bridge / Camera Raw / StarNet++
Links
Taken with a TMB92L, Canon T3i DSLR, and Celestron CG-4 mount. Consists of 38 light and 29 dark frames, each a 35-second exposure at ISO 800, stacked in DeepSkyStacker and processed in Photoshop.
Taken at 2018. DEC. 31
www.flickr.com/photos/ikjunerd/46551923751/
Star removing tools:
- Star-mask of DeepSkyStacker
- Adobe Photoshop (Spot Healing Brush Tool)
Also known as IC 434 and Barnard 33.
The horsehead nebula is approximately 1,375 light years away in the constellation of Orion. A very difficult target to find in a telescope, it's possible with a large aperture using specialist filters. A camera that can pick up Ha it's much easier :-)
IC 434 lies on Orions belt close to the flame nebula with the very bright star Alnitak (just visible lower left) separating them.
Image captured at The Astronomy Centre, Todmorden, UK on 10th of November 2023.
Boring techie bit:
Skywatcher Quattro 8" Newtonian Reflector steel tube with the f4 aplanatic coma corrector, Skywatcher EQ6 R pro mount, Altair Starwave 50mm guide scope, ZWO asi120mm guide camera mini, ZWO asi533mc pro cooled to -10c gain 100, Optolong L'enhance 2" filter, ZWO asiair plus.
120 second exposures.
Darks, Flats & Bias.
Stacked with DeepSkyStacker and processed in PixInsight & Affinity Photo.
Messier 100 (also known as NGC 4321 or the Mirror Galaxy) is a grand design intermediate spiral galaxy in the southern part of the mildly northern Coma Berenices. It is one of the brightest and largest galaxies in the Virgo Cluster and is approximately 55 million light-years from our galaxy, its diameter being 107,000 light years. (ref: Wikipedia) The last time I imaged this galaxy was March 2023 when the dwarf planet Ceres was passing between the Earth and Messier 100 spiral arms.
Observation data (J2000 epoch)
Constellation: Coma Berenices
Right ascension: 12h 22m 54.9s
Declination: +15° 49′ 21″
Distance: 55 Mly
Group or cluster: Virgo Cluster
Apparent magnitude (V): 9.3
Tech Specs: Orion 8” RC Telescope, ZWO ASI2600MC camera running at -10F, 162 x 60 seconds (2 hours and 42 minutes), Celestron CGEM-DX pier mounted, ZWO EAF and ASIAir Pro, processed in DSS and PixInsight. Image Date: February 5, 2024. Location: The Dark Side Observatory (W59), Weatherly, PA, USA (Bortle Class 4).
with lot of light pollution but I did it !
4 photos (20s at F3.5 and ISO 1250) stacked in DeepSkyStacker , then worked in Lightroom and Photoshop
My Facebook page: www.facebook.com/AlexandreDPhotographies
NGC 7331, also known as Caldwell 30, is an unbarred spiral galaxy about 40 million light-years (12 Mpc) away in the constellation Pegasus. It was discovered by William Herschel in 1784. NGC 7331 is the brightest galaxy in the field of a visual grouping known as the NGC 7331 Group of galaxies. The other members of the group are the lenticular or unbarred spirals NGC 7335 and 7336, the barred spiral galaxy NGC 7337 and the elliptical galaxy NGC 7340. These galaxies lie far in the background at distances of approximately 332, 365, 348 and 294 million light years, respectively.
Telescope : T120 (www.obs-hp.fr/guide/t120.shtml)
Camera : Andor iKon-L 936 (www.obs-hp.fr/guide/camera-120/camera-120.shtml)
Filters : UBVRI Filter Set (www.obs-hp.fr/guide/camera-120/ubvri.shtml)
Acquisition :
Lights : RGB, total ~15min
Darks : no darks
Flats : 25 flats for each color
Bias : 25
Software :
Pre-processing : DeepSkyStacker
Processing : Siril, Pixinsight
Post-processing : Lightroom, Photoshop
Target:NGC 2237 Rosette Nebula, an HII region in the constellation on Monoceros at 5200 light years distance.
Location:27/02/21, 28/02/21 and 01/03/21 from St Helens UK Bortle 8 with 99% Moon.
Aquisition:56x 180s Ha, 60x 180s (OIII), 59x 180s (SII). Total integration 8 hours 45 min.
Equipment:Imaging: Skywatcher Esprit 100ED, HEQ5 Pro, ZWO ASI1600MM Pro, EFWmini, Baader narrowband filters.
Guiding: Skywatcher 9x50 Finder, ZWO ASI120MM.
Software:Aquisition: NINA, PHD2, EQMOD.
Processing: DeepSkyStacker, Photoshop, Siril, Starnet++.
Memories:99% moon on 27/02/21 so conentrated on Ha and (SII) data. Better separation from 97% moon on 28/02/21 so included (OIII) though air quality was poor with smoke hanging in the air. Better on 01/03/21 until the clouds rolled in. Ambient temp 6c.
M1 the Crab nebula
Supernova remnant
Ocala, FL
Taken 1.22.11, 1.23.11 and 11/19/2011
Constellation: Taurus
6,500 light years distant
Combination of 360 second exposures and 480 second exposures stacked in DeepSkyStacker and processed in PhotoShop CS5 for a total integration time of 5 hours and 20min.
Astro-Tech 6" Richey-Chretien
Orion 50mm guide scope with SSAG
Canon T1i (modded)
Losmandy G11 with Gemini II
Hutech IDAS Light Pollution Suppression (LPS) Filter
Shot on the evening of 15th April from Old Winchester Hill, Hampshire, England. 19 light frames with darks and bias too. You can see that it was 19 shots to the right of Venus, presumably a satellite shown in stop motion! Shot with an old Sigma 70-210 f2.8 (at the 210 end) which has not been chipped so can only be shot wide open.
Explored 16/4/15
7791 views in one day 17/4/15!