Board index ‹ Photography ‹ Technical Questions ‹ I need to test the acuracy of a lens
dang wrote:Hi Chris,
Yes, I understand you're not shooting macro with it, I wasn't clear. It's closest focus is around 8 ft. I guess? Effective f/stop could still comes into play at it's closer distances, along with magnification amounts when comparing lenses. If you test against another lens under controlled conditions, I assume you mean inside. That's why I mentioned effective numbers.
Higher contrast shouldn't change aperture by so much, but should give more punch to your unprocessed files. Of course, you could adjust contrast "in camera" and see what happens. Also, try shooting a white wall under sun light and see if there's color halo... this could indicate a lose/misaligned element.
You could test both against a "hand held" meter, my results are usually within 1/3 stop between similar focal lengths.
Lastly, which lens are you comparing, and what type metering are you using? Don't forget angle of view between the two. If angle of view is wider on one, depending on scene, it can cause drastic changes.
I understand you're using Nikon, but I generally find Canon "L" lenses seem faster to me, so this intrigues me. The best I've come up with... quality elements reduce stray light bouncing around, making better use of whats collected. Perhaps this comes into play with your new lens?
Board index ‹ Photography ‹ Technical Questions ‹ I need to test the acuracy of a lens
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