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ChromaticAberationTest.jpg

ChromaticAberationTest.jpg


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Lensrentals16-Nov-2013 18:19
This image is entered in the category of:
- ad hoc lens testing

To test lenses for lateral and axial chromatic aberration, in the spirit of the Red Green show, what you need is
a black felt cloth and one piece of teflon dental floss. Then:

1) Grab a random piece of furniture in your living room.
2) Hang the felt cloth on the back of the furniture. Artistically arrange the dental floss on the black cloth. (spouse raises eyebrows)
3) Illuminate with bike headlight. (even more spouse points if you bring the bicycle into the room to hold the light at a convenient height)
4) Put camera in live view and focus in and out to check out foreground and background color bokeh and lateral aberrations. Try different apertures
and use zoom in live view for critical analysis. When you find something interesting take an actual capture to save for future reference.
The fine shreds of floss let you check out sharpness at best focus.
5) Leave entire setup in living room for several days "just to check out a few more things", incurring maximum spouse puzzlement points.
6) I've actually done this!

The image shows a NEX-7 and Canon New FD 80-200mm F4L zoom lens undergoing this rigorous testing proceedure. That Canon lens works amazingly well on a mirrorless camera, despite being pretty old, its performance is nearly up to current standards. Plus it is very compact and light compared with autofocus lenses. The image was taken with a Nikon D800 and Zeiss 100mm macro.

All of this kind of testing might be better done late at night to avoid strange looks from spouse, kids, and dog.
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