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In good clean used, the mirror is coating are in pretty good order also. Usable surface in my opinion is 415-420mm, and it has a very rough focal ratio of F5.2/5.5 (
To get the rough F/ratio, I used an LED close to me eye until it filled the whole parabola, then measured the distance, so hardly exact :)
Please ignore the postage amount on my site, as it won't be able to calculate for a mirror this large & heavy. If you want it postage then please get in touch for a quotation