View allAll Photos Tagged testing,
personally, i think using sticky notes was a brilliant idea.
unfortunately, $5 says my teacher makes me redo them tomorrow. :l
p.s. dont let the stickies fool you, i didnt fail this test! i got a b. haha. (:
Today, I took my 85mm ƒ/1.8 lens out for a little test session in the real world. I set up a tripod off the side of our local Catholic church, and proceeded to shoot the same scene with AF on, in AE (shutter priority) mode, with shots starting at ƒ/1.8 and going all the way to ƒ/22 in 1/3 ƒ-stop steps.
The objective was to see where optimum sharpness was to be found; as a bonus, I also learned how chromatic aberration behaves in this lens.
Peak sharpness is, without any question at all, found at ƒ/6.3, in the image you see here. Sharpness is excellent at ƒ/4, then shows small increases up to ƒ/6.3. Then sharpness begins to roll off gently at ƒ/7.1 and ƒ/8.0, shows a distinct though not yet highly objectionable decrease at ƒ/9.0, and the absolutely takes a dump at ƒ/10. This makes a lot of sense to me because with the 50D's 4.7 um pixel pitch, diffraction begins to take effect at ƒ/7.6 (not an available setting on the 50D, btw) and by ƒ/10, the Airy disc has far exceeded the diameter of a single sensel — so we're well into diffraction-caused blur by ƒ/10, regardless of the len's other sharpness-related factors.
Chromatic aberration is strongly evident (mostly at the left edge of the large tree at foreground center where the dark tree intersects the well illuminated concrete of the building at this angle) starting at ƒ/1.8, and reduces just a little bit with every 1/3-stop taken until ƒ/13, where I cannot see any remaining purple fringing. Unfortunately, this is far beyond the objectively determined peak sharpness of the lens at ƒ/6.3. If you look at the tree in this image, you will see some CA.
So... in high contrast situations where I feel I can give up some sharpness, I'll be thinking ƒ/13, light permitting, and when I'm looking for max detail, it'll be ƒ/6.3 to about ƒ/5.6. The best compromise -- the setting where sharpness has not fallen off much and CA reduction is as high as possible at the same time -- is about ƒ/8.
This image, as far as I can tell, demonstrates the best sharpness that can be shot with this lens and camera. It is a consequence of:
EOS 50D, Canon EF 85mm ƒ/1.8 USM prime @ ƒ/6.3, ISO 100, 1/200th sec. exposure, tripod, 2 sec shutter delay.
RAW to JPEG conversion with Aperture.
A test of the EOS M with 22mm f/2 lens (not pictued) I bought at a low price. It isn't perfect, but it is hard to beat without paying three times as much.
I combined several exposures to make this image to go through all the regular processing I do. As a result, it is a good test for the lens, although I did correct for chromatic aberration, but not a good test for the camera.
The FLM Centerball ballhead in the picture has been great for macro photography. While I lock the sphere in place, it doesn't move unless it is very lose and I don't support the camera. This means I don't have to make several attempts to compose the image because the ballhead keeps pointing the camera somewhere I didn't.
Test Site Rotterdam
Test Site Rotterdam is a project by the IABR and the architecture office ZUS that focuses on the Rotterdam Central District. Vitality must be restored to this urban district. Although in today’s market economy, it’s hard to say when that will happen. Experiments with strategies to revitalize the heart of the city using alternative forms of funding, planning processes and design tools are taking place at Test Site Rotterdam. The projects include the Roof Gardens, Park Pompenburg and an elevated walkway (the Luchtsingel). Test Site Rotterdam runs until 2014 and is one of the platforms on which the 6th IABR is being developed.
This is a test series with my new toy: Sigma 18-250mm DC OS HSM. I used to have the prior version (18-200) and I think it is a very nice "always-on" travel lens.
ISO 200, f4.5, 1/80, 18mm, auto white balance
Nikkor AF-S DX 18-105/3.5 - 5.6 G ED VR
no image editing. picture directly out of cam!
I wrote an article about the test. Please check here for German speakers: www.doreen.es/2008/09/09/nikon-d90-test/
PS: Sorry I didn't care about image details // Bitte nicht auf Bildausschnitte achten, hab ich auch nicht gemacht ;)
a quick test of the Nikon 28mm f2.8 on the A7R. I already had a Vivatar 28 with a Canon mount but I had purchased a variable ND filter mount and it was for Nikon. (most of my fast lenses were Nikon before I sold them) I'll use this combo for some long exposure experiments...
The Nevada Test Site is owned by the Department of Energy and is the largest known energy research area in the world.
Ce bunker sur Frenchman Flat a résisté aux explosions de l’opération Plumbbob. Les archéologues n’ont pas pu encore en visiter l’intérieur. Ils attendent que les services de sécurité procèdent, plus de 40 ans après les tests, aux mesures de radioactivité.
These are for a project-in-progress, but I like the way they were subconsciously assembled when I moved them.
Testing my new Genus Tech eclipse ND Filter - full sun, dialed down from f16 to f 4.0
Light: Elinchrom D-Lite 4, 1/1, in a Aurora Striplight 40x120 with grid, arm length away and above head, horizontal orientation - reducing shadows left and right but not under chin etc.
This is one of the test stands at work. They used to test SSMEs on it, but now it sits as a monument to what it once was.
Copyright© 2008 John David Photography / Photographer FX
This image is protected under the United States and International Copyright laws
Do Not Repost ,Download, Alter,or use this image in any way ,shape or form without
My expressed written consent to do so
Human test Subjects are used everyday
All over the world Some are Willing participants who get paid , While others just pay the price !
Read Into this shot How you see fit
My intention with this Photo is to upset and disturb any and Hopefully everyone who Looks upon it .
.......................................................
The Harsh reality of Mankind's search for Power and wealth, does go to far sometimes. sometimes in the name of money , sometimes in the name of National Defense ,sometimes just in the guise of a "Greater Good"
Private companies run studies And a lot of this type of research is done using Low income people ,students,also Military recruits in the United States but is also prevalent in India ,Europe, Asia,
This is a $14 billion dollar Industry in the united states alone
I am not totally against Human testing as long as the participants have full knowledge of whats going on and are completely willing
But The question is " How Far is to far ?"
And who gets the job of making sure that everyone is Playing by the "rules"
what will the punishment be for someone who breaks the "rules" ?
Konsulent for forebyggende arbeid Anne Kristine Nergaard tester oppblåsbare redningsvester ved å blåse dem opp manuelt.
This was just a test shot to make sure my camera settings were right, but Ava decided to smile anyway.
BMW 520 Diesel. Used as testcar by the Dutch Police because the leasecontracts became to an end. Pic made in 2011.
Testing flexibility of clay as part of my strength tests on the new Studio by Sculpey brand clay. The pictured clay is actually Premo! brand, which I rolled out to the third thickest setting on my pasta machine, then baked.
See my blog for the full write-up of these Studio by Sculpey strength tests:
blog.craftygoat.com/2008/03/studio_by_sculpey_strength_te...