Yes, follow Piers' advice immediately. With the ND4 you're losing two
stops (1/4 of the light) from f/8 so it's as though you're trying to
focus at f/16. It's amazing that you can see anything.
Chuck Norcutt
Piers Hemy wrote:
> If I understood you correctly, Scott, you have a ND4 filter permanently on
> your 600/8 lens. That being the case it isn't surprising that you are
> having difficulty focusing, especially on the half-size E-500 screen. I
> don't think I would be able to focus that on an OM screen - in fact, I think
> I might nit be able to frame the subject, let alone focus.
>
> Suggestion #1 - take off the ND filter. Don't worry that you don't have a
> plain glass to replace it, because I reckon the degradation that might
> result will be much preferable to the out of focus results you are presently
> "enjoying".
>
> Suggestion #2 - if the above doesn't suit, or doesn't get the results
> needed, get hold of a large searchlight as a focusing aid ;-)
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