Skywatcher 80mm f/5 achro - outside diameter, please

mental4astro (Alexander) · #1 13-10-2015, 11:07 AM

Hi folks,

I have a GSO refractor focuser that is for an inside diameter tube of 86mm. It came off an 80mm scope, but its objective lens is a very poor one. If I can I'd like to salvage the focuser, putting it onto a better quality Skywatcher achro.

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So I would like to know the outside diameter of a Skywatcher 80mm fl400 instrument, please - this way you don't need to remove the focuser to measure the inside diameter.

Many thanks,

Mental.

MattT · #2 14-10-2015, 03:11 PM

Alex,
My 80 f7 achro uses an 86mm focuser if that helps, not the same scope I know....close though.
The 102mm f5 achro uses the 96mm flange.

Matt

mental4astro (Alexander) · #3 14-10-2015, 03:12 PM

Thanks mate,

MattT · #4 15-10-2015, 09:38 AM

What's so bad about the lens? Is it used? Maybe someone has taken the objective apart and put it back together back to front...sort of thing I used to do as a kid

mental4astro (Alexander) · #5 15-10-2015, 09:51 AM

The lens gives a hazy image, and focus is a little soft. Image is so poor that even in monochrome that is solar H.alpha in my Quark, the image is both hazy and soft. Not a piece of glass I will be passing on to anyone, only the bin.

I did have an 80mm f/5 scope that used a lens from Surplus Shed. Now that WAS a good lens for a modest achromat. Had a 2" focuser too. I sold that little scope long before I got the Quark. Would have been a match made in heaven... Now I'm looking for another...