Question 1

if i used a 2x Barlow with the 39x eyepiece could i see shooting targets at 600-900 yds?

Accepted Answer

Let me start off by saying that I have not actually tried this, but I can give you some pointers.  The 2X Barlow will reduce your available light, but on a very sunny day that should be no problem.  At that magnification, you will need a very steady tripod, as even a small breeze may make your image unstable.  I will say that I am very pleased with my C-90 Mak, and I do some Astrophotography with mine.  This particular scope is the equivalent of a 1260mm lens for your camera.  With the camera directly attached to the scope, you can get the full moon in the picture with very little edges.  I take pictures of Sunspots with it too, but please don't do that without putting a full filter on the front of the scope.  In your application, I would start with a 32mm eyepiece and then move up to say a 15mm or 10mm eyepiece.  One other note, invest in some Plossl Eyepieces.  they will give you a much sharper view, and will be brighter.  I bought the following set for my scope.  Celestron Accessory Kit.  I hope this helped.

Question 2

I want to use this for long range spotting 800-1500 yards.. Any ideas on how well this will perform?

Accepted Answer

What will you be spotting? You may lose some of the detail near the center of the image with this telescope as well as other reflecting type telescopes due to the mirror in the light path. You likely won't notice this but if you are trying to get spot on detail for target practice it may be annoying. It certainly has the magnification though for this task. Would a refracting type scope be more suitable?

Question 3

I would like to use this as a terrestrial scope to view mountains in the distance. Would like detailed view of ski slopes.  Aprox 20 miles away.

Accepted Answer

I have a 127mm Mak, using a 32mm Televue plossl, and William Optics correct image prism.  That gives me approx. 47x to this scopes 39x.  At 20 miles, the scope is never the issue, the atmospheric conditions are.  If you're looking through clean, dry air, 20 miles will be crystal clear and sharp.   If there is moisture or dust in the air, 10 miles is too far.

Question 4

Could I mount this to an celestron AVX 8 inch scope? and use it with a star tracker?

Accepted Answer

Yes you can! the AVX tripod will take any scope with a dove tail rail, which the Mak spotting scope has. For details google the Celestron AVX manual. You will find a pdf on the celestron site. There is a blow up diagram showing the dovetail mount and screw that secures the scope. Owing to the relatively low weight of the Mak C 90, you may not need the large counterballance weight that comes with the AVX, or you might get by with a smaller weight

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Celestron C90 Mak Spotting Scope, Black

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