Do I have focus shift? (Image attached)
I attached my CV 35mm f/1.2 to a micro four thirds camera and did a quick focus shift test. I don't have any clue how to asses lens focus shift. Please note that I also have very bad eye sight. Someone else with a better eye would be best at telling me what I may not be seeing.
Setting: The barcode is on a paper receipt. The barcode is about 1.25 inches in length. The m4/3 camera was set about 0.5 meter from the barcode. I didn't have a tripod, but I did stabilize the camera as best as I could while I changed the aperture.
Testing done under my bedroom's light at 8PM.
My focus was at the number "4". I realized that as I stopped the lens down, the barcode to the right quickly became more in focused than the numbers on left. However, "4" is still sharp...
Does this lens have focus shift? If so, how bad?
Would the focus shift be worse/more noticeable if I had setup the testing any other way? ie. farther camera from subject, etc?
- Canon EOS M58.8%
- Panasonic G85/G803.3%
- Panasonic FZ2500/FZ20001.9%
- Panasonic LX10/LX151.2%
- Panasonic GH5 development3.6%
- Sony a99 II15.9%
- Nikon KeyMission 170 and 801.0%
- Fujifilm GFX 50S development28.3%
- Olympus E-M1 II development18.7%
- Olympus E-PL80.1%
- Olympus 25mm F1.2 Pro1.5%
- Olympus 12-100mm F4 IS Pro1.9%
- Olympus 30mm F3.5 Macro0.1%
- Sigma 85mm F1.4 Art3.6%
- Sigma 12-24mm F4 Art2.6%
- Sigma 500mm F4 DG OS HSM Sport2.4%
- YI M12.2%
- GoPro Hero50.8%
- GoPro Karma drone2.2%
|Sunflower Field by GrannyMeg|
from An impressionist piece
|Flag from Staten Island Ferry by wam7|
|SAND SCULPTURE by duskman|
from Landscape - Black and White #4