Just short qustion: does the coverage of meniscus lens increases when it is used taken out of the barrel? I have heard something like that today. Normaly the coverage reduces when the aperture is opening and increases when it's closing.
Just short qustion: does the coverage of meniscus lens increases when it is used taken out of the barrel? I have heard something like that today. Normaly the coverage reduces when the aperture is opening and increases when it's closing.
Yes, the coverage increases when out of the barrel. This is because the barrel causes some vignetting.
Thanks Stephane.
Have you noticed is it significant coverage increase or minor?
Significant. I felt there was no coverage limit
I can check later how much (in day light). I'll try from the shortest FL I have (140mm?) on 8x10 focused at infinity and tell you tomorrow evening.
You can also try on your side with whatever you have, so we can compare the results...
Keep in mind that as you progress outwards farther from the center, the image will degrade significantly. Illumination does not mean useful coverage. But the loss of image quality may be acceptable, even desireable, for those who know how to use such things.
"I love my Verito lens, but I always have to sharpen everything in Photoshop..."
So, I'm going to ask the dumb question that I hope someone else out there is curious about. What exactly do you mean when you say " taken out of the barrel" Does this mean you have one piece of glass and you glue it to a lens board. I know I'm not the brightest guy around but this is confusing to me.
Some of us have iris clamps, so you just unscrew the rear element and fix it on the iris clamp. No glue. No tape.
the 150mm covers 8x10, or at least illuminates the gg.
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