Can you comment on the edge sharpness based on your brief encounter.
Thanks
Hi;
First some comments about the photos since it appears some do not know their purpose.
These photos are for testing purposes, they are not intended to be like a photo shopped bird picture made to look good, nor are they intended to make an optic look bad.
They are intended to put the whole field of view on a flat plane were all parts are at the same focal distance and focused at infinity, the optics design 0 diopter setting. This way you can measure, with various optical measuring tools, the geometric (grid) properties, focus errors throughout the image, FOV and other important parameters and their position in relation to the optical axis and focal plane.
These images will, by their nature, look worse than what we see since most optical instruments and cameras or CCD sensors either remove by magnification, or do not have any accommodation like the human eye.
Now, as to what I see:
First, I always center objects and very seldom pay any attention to the periphery. This comes from many years of looking through instruments with cross hairs in them where you center your target.
Secondly, a few months ago I had cataract surgery on both eyes and IOL’s put in and my accommodation is greatly reduced, not to mention changing randomly through the day, so I am not a good reference for others. What you will perceive will be based on your individual parameters. I doubt if any of us see exactly the same thing anyway.
FWIW, when I was looking at the flat field target I measured the curvature/astigmatism at about 3 o’clock, at 3° from center, at 1.8d, so if you have greater than 2d of accommodation, chances are the edge will look pretty good to you. Even for my lousy accommodation, I did not notice any real edge falloff, but then I may not have noticed it unless really looking for it.
Since a few have made mention of the LXL, I took a quick, rough photo so you can compare (forgot to change white balance from other light source).