Hi all,
This is posted on behalf of Gary Reese. His words.
>
> Gary's tips to determine if a filter is a bum one:
> 1. Is it harder to focus with the filter on vs. off? Assuming the filter
> doesn't hold back much light (i.e., has a low filter factor), a bum filter
> won't give you the kind of focus snap you would get if you removed the
> filter.
> 2. When you take identical shots with and without a filter at full aperture,
> can
> you detect poorer images when the filtered shot is enlarged? If so, it's a bum
> filter.
>
> For more comparisons with and without filter, see his Canon FD lens tests at:
> http://members.aol.com/canonfdlenstests/default.htm
Cheers, Brian
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