Back Focus Revised - New Info...

Started Dec 29, 2005 | Discussions thread
OP PhotoLeon1935 Senior Member • Posts: 2,305
Re: Back Focus Revised - New Info...

Wallly suggests to close each lens 1/2 to 1 stop and try again. Some lenses are compromised at their outer edge and cause faulty focus shift. Sometimes a mechanical coupled focus will be different from the electrical wave motor focus. Example 50mm f1.4 is mechanical, kit lense is wave motor. There are a couple of theories about this. I now have an IR/UV cut filter on my kit lens and it blocks IR totally and may focus differently now.

Summary: I don't know.
TANSTAAFL - There aint no such thing as a free lunch.
If it sounds too good to be true it just might be so.

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