Many years ago I purchased a Tamron (I believe) 500 mirror for my M series bodies and 
K-1000.  There was noticable loss of sharpess but contrast really took the big hit.  
It eventually was stolen from my car while
on a trip (along with a Vivitar 283 flash and SMC-M 135/3.5 lens).  I replaced the 
flash and the 135 but not the mirror lens.

I don't think the mirrors can compare image-wise to the optical tele's but the optical 
lens can't compare to the mirror in price.  If you need a long lens at an affordable 
price, by all means try one.

I've got one shot with the 500 mirror on my web site:

http://people.mn.mediaone.net/sscott2/Text_Files/bottle.htm

Regards,
Steve S.

[EMAIL PROTECTED] wrote:

> Hello folk, new guy again.
>
> I am considering a 500mm tele addition to my modest stable. I have two alternatives 
>presently, one is a Tamron f8 mirror tele and the other is an Pentax f8 optical tele. 
>What advice have you for a rank amateur?
>
> BTW, Many thanks to all who responded on the zoom lens query! I went with the Tamron 
>100-300 Macro. Nice save, gentlemen!!!
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