18" 455mm - F/3.5-F/4 ish fast Newtonian Mirror

In good clean used condition. it was still sealed on top when I unpacked it, so the coatings are still factory fresh

Usable surface in my opinion is 455mm, and it has a very rough focal ratio of F3.5-F4, whichever way you look F3.5 or even F/4, thats a big fast mirror

To get the rough F/ratio, I used an LED close to me eye until it filled the whole parabola, then measured the distance and divided it by 2, so hardly scientific or 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

 

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