Would this be a good starter for a 9yr old boy?

Personally, I would think he would get more use from a good set of 10x50 or 10x40 binoculars. I enjoy my binoculars more because you use them more being able to observe more sky area. The telescopes get old because you zero in on a particular spot and with the earths rotation, the spot moves while you observe, can be a pain. Hope this helps.

Will a 2x Barlow lens work acceptably with the adapter and using the original zoom lens? I like the reviews on the Orion model sold on Amazon.

I think you might be pushing it to the limit with a 2X Barlow... at max. zoom, there is already vignettting at the outer edges. I would move on to a bigger scope if you want more magnification, personally. It's a good little scope as it is - pushing it beyond its intended design would be like a Ferrari engine in a VW Bug.

Are grey edges on the outsides of the picture normal? I have a very tiny viewing angle where things look good.

This can be an issue at higher magnification. Image unacceptable at 50x and up.

Is this light enough that it can be used with a 90 degree tripod adapter without toppling over? Will be used from a seated position off to the side

Is very light, it will work with 90 degree tripod

Mini Mak 70mm Angled Spotting Scope – Maksutov Spotting Scope – Great for Long Range Viewing – 25–75x Zoom Eyepiece – Multi-Coated Optics – Rubber Armored – Tabletop Tripod Included

产品编号: 1494899

细节

Brand
Celestron
Model Name
Mini MAK 70mm
Optical Tube Length
70 Millimeters
Eye Piece Lens Description
Brandon
Objective Lens Diameter
70 Millimeters
Telescope Mount Description
Equatorial

🌌25-75x Zoom

🔭70mm Aperture

🪐Lightweight 2 lbs

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描述

🔍 Discover the Universe, One View at a Time!

EASY TO TRANSPORT - At just 11 inches long, take your observations anywhere with ease.
VERSATILE VIEWING - From birdwatching to stargazing, this scope adapts to your adventurous spirit.
COMPACT POWERHOUSE - Experience the perfect blend of portability and performance with the 70mm Mini Mak.
LIFETIME ASSURANCE - Shop confidently with a Limited Lifetime Warranty and expert support from Celestron.
SHARP BRIGHT IMAGES - Enjoy crystal-clear views of distant targets with multi-coated optics.

The Celestron Mini MAK 70mm Angled Spotting Scope is a compact and lightweight optical device designed for versatile viewing, featuring a 25-75x zoom eyepiece, multi-coated optics for bright images, and a portable design perfect for both terrestrial and celestial observations.