Thanks for the comments. 'Lower contrast' is probably good news, seeing as
it's hard to imagine actually using it in anything but hard light. Should
knock down the doughnuts a bit!
I picked up a bunch of 30.5mm filters for it but notice that there is a
Tamron 'Normal' filter with it which appears to have no effect - like a
protection filter. Seems odd as it's not protecting a delicate front
element but I have a very vague memory of reading that mirror lenses
'prefer' optically to have a filter in place so that a 'no-change' filter
should be used when you aren't using a neutral density or other type. I
know that Nikon make a 39mm NC filter for the back carrier of their big
lenses too so it sounds plausible. Anyone know if this is true?
AndrewF
>Dear Andrew / Bruce,
><< Bruce
> I was going to ask if anyone on list had the TamronSP 500/8 mirror as I
> just picked one up fairly cheaply - already had the matched doubler. >>
>
>I have had a Tamron 500mm f/8 for about 6 years now - I have used it from
>time to time and liked it once I got used to f/8 lenses. I didn't change my
>OM-4Ti screen brecause I dont use slower telephotos a lot.
>
>Sitting at the top of a Cornwall beach reading a book on Mahler(!) in 1994, I
>took some nice and very clear shots of my mates surfing, but there were no
>embarrassing wipeouts!
>
>I also used it for the total lunar eclipse late last Summer 2000, using
>exposure guidelines from eclipse books and bracketing quite a lot, also some
>attempts at spot metered auto mode witht he OM-4Ti to find out what it gave.
>Standard screen again.
>
>I have never used the 2x converter with it, but I might get one someday - of
>course, that would take it to f/16, which would probably necessitate a change
>of screen, but it depends on the subject I guess.
>
>I noticed that the focussing goes 'beyond infinity' which I guess is common
>with long telephotos. I had to get used to this a bit, but I have since found
>it easy enough to focus on the matte screen background with both the lunar
>and daytime subjects.
>
>I've not encountered any problems like you described with the Celestron 300
>Bruce:
>
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