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Spiratone 20mm lens adapted from Nikon to Pentax mount
Adapting from Nikon to Pentax :
Took off Nikon mount. Rearranged the spring pulling the aperture lever to pull it the other way (so that aperture would stay closed as selected) There was a convenient whole in the right place. Took cheap M42 to PK adapter - the kind that does not allow for infinity focusing, overlayed it with Nikon mount and drilled wholes for screws. (You want to countersink the screws so that they are flush with the surface once screwed in.
Shaved off aperture indexing ridges with a file and attached the drilled adapter. Adapter is too thin to completely countersink the screws, so had to shave off a little bit of screws heads with dremel tool.
At that point lens becomes useful but infinity focus is off as lens ends up sitting closer to sensor then it should. Collimation is necessary. On 20mm lens it's easy - take off rubber focusing ring and peel the sticky tape underneath - at that point distance scale separates from focusing helicoid and allows to adjust focusing. Once adjusted - put sticky tape back on and rubber ring on top of it. Done.
Despite almost identical register distance and similar sizing of the mount not every Nikon lens could be easily converted to pentax - the difficulty is the auto-aperture lever - it needs to somehow be pulled in opposite direction with the spring. Depending on lens design it may prove to be impossible task, in which case the lens will be stuck wide open.
Hey, I'm running a startup for creatives - photographers, designers, creative agencies etc. Check this out - pics.io
And use this picture properly ;)
Almost there! I just need my UART, SRAM, and trickle charge time keeping chip to come in, and I can do my first full test.
I committed heresy and added a Nikon AR-9 soft release to this Oly 35 SP, but for me at least it considerably improved the feel of the shutter.
Quick check of the new (to me) Olympus OM Zuiko 100mm/2.8 lens. This shot at f/8 of my ZD 12-60mm lens.
2015.03.29-14.10.52
MFOS Sound Lab Mini-Synth in progress... Both (mostly completed) boards and a little bit of my work area.
4 NAND (2И-НЕ) элемента. Глядя на гигантский размер кристалла (944x854 µm) — становится очевидно что и «старые» микронные технологии до сих пор используются. Интересно обилие «резервных» via для увеличения выхода годных.
Olympus OM-D Action Factory with the new E-M5 Mark II, Prague, Czech Republic. A former water purification plant. A sample of the new M.Zuiko 8mm f1.8 Fisheye lens. February 09, 2015. Photo: Edmond Terakopian
Here's a little video of it: blip.tv/file/843294
Check out more info here:
The Mini Seoul Project is a medium-and long-term plan which recreates landmarks around Seoul City Hall and This work reproduces details of City Hall, the Bank of Korea(BOK), Jong-ro Tower, the Chunggye creek, Mount Nam and N-tower. Until now this construction has been taking 2 months and 150,000 bricks. For a long term plan, this Mini Seoul is being built to express the whole of Seoul city.
Sidney, NY. October 2017.
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Das Fotoversandhaus "Quelle" ließ sich die Chinon CE-3 als "Revueflex AC I" anfertigen. Es ist eine der letzten M42-SLRs mit Zeitautomatik. Beim Auslösen wird abgeblendet, durch blitzschnelle Si-Zellen dabei so schnell gemessen und korrekte Zeit eingestellt, dass es einem wie Offenblend-Messung vorkommt. Also einfach den Auslöser durchdrücken und es wird richtig belichtet! Das geht natürlich nur bei Objektiven mit Springblende. Genauso funktioniert übrigens die Cosina Hi-Lite ECL, die Revueflex 5000 EE und die Porst Reflex MC-E.
Verkauft von Foto-Quelle ab 1978.
Poughkeepsie, NY. October 2016.
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One of the circuit boards that appears in the "transistors" shots. Labeled with the Hewlett-Packard logo (not shown here).
ACE ELECTECH LTD has been providing customers with quality circuitry for several years running. Our trusted and respected China PCB Manufacturer offers high quality PCB products with responsible prices on a wide range of advanced and state-of-the-art circuitry for a host of applications. Give a call:- +86-755-86036115.
Here is the main power plug, power switch and some other components in the power path.
The two little grey squares (FB20 and FB21) are Ferrite Beads - essentially some small chokes to try and filter out harmonics in the voltage (the input is AC not DC).
Between the plug and the two ferrite beads are two Capacitors C150 and C155. The internal pin of the power plug is tied to C150, which leads directly to C155.
I cannot see any way to see markings on C150 or C155 to determine the ratings of the two capacitors.
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© 2015 Thousand Word Images by Dustin Abbott
My review of this stellar new manual focus lens is now live. I detail some serious shortcomings with the lens, but also note that it produces some stunning images with great drawing and bokeh. It's worth a read or a watch:
Text Review: bit.ly/1C5QTlw
Video Review Part 1: Build and Handling: bit.ly/1EegzLZ
Video Review Part 2: Image Quality and Conclusions: bit.ly/1MvwU2V
Technical info: Canon EOS 6D, Canon EF 100mm f/2.8L IS USM, Processed in Adobe Lightroom 5, Adobe Photoshop CC, Alien Skin Exposure 7 (use code "dustinabbott" to get a 10% discount)
Want to know more about me or make contact? Take a look at my website and find a lot of ways to connect and view my work.
Il marchio Pentacon propose la Praktica LTL dal 1970 al 1975 e fu la prima fotocamera del gruppo ad avere la misurazione dell'esposizione TTL in stop down, attivata da una levetta posta di fianco al pentaprisma che consente di ottenere con un unico gesto sia la lettura esposimetrica che lo stop-down. Essa si poneva a metá tra le semplici L e LB, quest'ultima dotata di esposimetro esterno al selenio, e le piú sofisticate EE, PLC e VLC con misurazione TTL a tutta apertura. Come tutta la serie L è dotata di un otturatore a lamelle metalliche con impostazioni di tempo da 1 s a 1/1000 s e “B”; la calotta e il fondo erano in plastica cromata, ad eccezione delle versioni nere. Caratteristico il pulsante di scatto inclinato sul lato anteriore, il mirino a pentaprisma con lente di Fresnel e reticolo a microprismi, l'autoscatto interno, il tempo di sincronizzazione per flash elettronici 1/125 s, e il sistema di carica rapida della pellicola
Come nella migliore tradizione del marchio, il corpo macchina solido e austero ha linee tese che riflettono il rigore tedesco. Come giá accennato l'otturatore è costituito da lamelle in metallo a scorrimento verticale anzichè in tela come nei precedenti modelli e il funzionamento della macchina è completamente meccanico, quindi nessuna dipendenza dalle batterie se non per l'esposimetro.
La dotazione tecnica è ancora oggi di tutto rispetto:
- Obiettivo con lente di eccellenza "Pentacon Auto" con focale di 50mm e protezione antgraffio e antiriflesso multistrato
- Diaframma con aperture da da f/1.8 a f.16
- Tempi di scatto da 1sec. a 1/1000sec più la posa B
- Esposimetro con lettura di tipo TTL e sensibilità da 12 a 1.600 ISO
- Autoscatto
- Slitta flash con contatto caldo di sincronizzazione
- Baionetta com passo avite M42
Le Praktica sono da sempre macchine solide e senza fronzoli, dedicate a coloro che cercano uno strumento affidabile e di sostanza, ideali per chi si avvicina al mondo delle reflex analogiche d'epoca e non vuole dissanguarsi con una ben più costosa Nikon o una Pentax di pari prestazioni.
Picked up this 1 month old Fujiflm XF 23mm F1.4 R lens last night, at a pretty good price. It wasn't an easy decision though. I also have the 18mm F2.0 and 35mm F1.4 lenses so it took me a while to justifiy and convince myself to get it.
Shot with the Fuji X-E1 and Fuji 60mm F2.4 Macro lens
Berwick, PA. August 2016.
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100 ohm, 1/4 W resistor.
As seen on Alpha Clock Five!
From an article about power dissipation, on our blog here.