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

ASIN	B0038QYRDO
Additional Features	Maksutov-Cassegrain Optical Design with High Contrast Views and Compact Portability
Best Sellers Rank	#132,146 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #29 in Spotting Scopes
Brand	Celestron
Built-In Media	32 mm Eyepiece, 45° Erect Image Diagonal, 8x21 Erect Image Finderscope and backpack
Coating	Multi-Coated
Compatible Devices	Smartphone
Customer Reviews	4.5 out of 5 stars 371 Reviews
Exit Pupil Diameter	2.3 Millimeters
Eye Piece Lens Description	Plossl
Field Of View	9.7 Degrees
Finderscope	8x21 Erect Image Finderscope
Focal Length Description	1250 millimeters
Focus Type	Manual Focus
Global Trade Identification Number	00050234522687
Item Dimensions D x W x H	15.7"D x 10.2"W x 10.2"H
Item Weight	2.1 Kilograms
Manufacturer	Celestron
Manufacturer Part Number	52268-CGL
Model Name	Spotting Scope C90 MAK Zoom
Model Number	52268-CGL
Mount	Equatorial Mount
Objective Lens Diameter	90 Millimeters
Optical Tube Length	70 Millimeters
Optical-Tube Length	70 Millimeters
Power Source	Manual
Telescope Mount Description	Equatorial Mount
UPC	050234522687
Unit Count	1.0 Count
Warranty Description	Limited Lifetime Warranty
Zoom Ratio	39 multiplier x

C90 MAK Spotting scopes (Black)

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