Fred Miranda wrote:
Rich,
It does not look centered from this test but...
It's hard to know if you were squared with the target, so I suggest doing this test at infinity distance so we can remove this variable and get an accurate assessment.
I have tried 3 loan copies and they were all centered. One was perfectly centered even on my A7R IV and the other two were almost as good. The issue with some copies was rangefinder calibration, not centering.
Fred
PS: You only need to test this at f/2.8.
Steve Spencer wrote: naturephoto1 wrote: Fred Miranda wrote: naturephoto1 wrote:
After receiving the comments regarding his Nikon version of the Apo-Skopar from Vivek, my results, and some suggestions to contact Stephen at Cameraquest from Ron, I called Stephen. He indicated that since I was not happy to send my copy back (I will send it back tomorrow in the same box that it was shipped to me) tomorrow via USPS Priority Mail. Stephen should be getting additional copies of the Black lenses in early January and my lens should arrive about the same time as he is receiving new copies. He will send me another copy.
Rich
Hi Rich,
From the samples you posted, I don't think there is an issue with your copy but the best way to find out for sure is to do a proper centering test.
As we've seen in this review, the Voigtlander 90/2.8 is not the highest resolving 85-90mm lens. It has many positive attributes but it's not breaking any resolution records. I have shot with the Zeiss 85/4 ZM for many years and it's capable of higher resolution, especially off-axis.
Also, although they share the same optical design perhaps there is a small difference in performance between the Nikon and M mount versions.
Hi Fred,
Since you have brought up the question of the centering of my lens, I will present my photos taken of a wall hanging with my tripod mounted A1 and the lens. These were taken of a wall hanging in our Dining Room. Unfortunately there is a rod that is visible in the lower right corner, but you can still get an idea from these images. The wall hanging was about 7' away from the tripod mounted camera which was leveled using the level on the tripod head and the camera. I can not guarantee how accurately the camera was equi distant from the left side and the right side to the wall hanging. Images are SOC camera with LR defaults and only made into JPEGs from the original RAW Compressed files.
The first set are taken at f2.8.
The second set are taken at f4.0
Rich
Rich, since to my eyes both the upper left and lower left are a bit weaker, it is difficult to tell whether you weren't quite square to the target or whether it is decentered. For such close distances it is really hard to get your set up exactly square. Like Fred said, if you can get an infinity distance shot being square to the target won't be important.
Hi Fred and Steve,
I just don't have time now to do this outside and at infinity. I am leaving in the morning and I either have to send the lens back or this latest indoor test is going to have to demonstrate it is or isn't centered (or close enough).
I went back and reset up the whole camera set-up and tried to level everything and square things as closely as we could with a tape measure, though I can't guarantee that my wife got the measurements exactly correct.
Shot this again at f2.8 with my tripod mounted A1, silent shutter, of the same target wall hanging. Results are SOC with LR defaults and saved as JPEG files.
