Feature

●【Wide range of applications】The Astrophotography focus mask works with all kinds of telescopes, mirrors, refractors, dobsons, mak cas and SCT. All you need to do is measure the size of your telescopic tube and choose the appropriate mask size.
●【Function of the Bahtinov Mask】The mask eliminates the guesswork of focusing and even overcomes visibility to give your telescope the best focus quickly and easily.
●【3 metal posts】: the mask holds the telescopic tube gently and firmly with three metal posts. These metal posts come with scratch resistant silicone covers to protect the surface of your telescope. This prevents slipping while keeping the mask perfectly centred.
●【POST INSTALLATION & LIGHTWEIGHT DESIGN】 Thanks to this 3 post holder, the mask stays centered while it can be adapted to a wider range of telescopes. The Bahtinov Telescope Focus Mask is lightweight so you dont disturb the balance of the scope.
●【Telescope Focus Mask - Applicable Size】The outer diameter of the Bahtinov mask supports the telescope objective lens in the range of 100-140mm(manual measurement error is 1-2mm)


Description

Function:
1. WIDE RANGE OF APPLICATIONS Works with all kinds of telescopes, mirrors, refractors, for Dobsons, for Mak Cas and for SCT, all you need to do is measure your telescopic tube size and choose the appropriate mask size.
2. Function of the Bahtinov Mask The mask eliminates the guesswork of focusing and even overcomes visibility to give your telescope the best focus quickly and easily.
3. 3 Metal Posts The mask holds the telescopic tube gently and firmly with three metal posts. These metal posts come with scratch resistant silicone covers to protect the surface of your telescope. This prevents slipping while keeping the mask perfectly centered.
4. POSTAL INSTALLATION & LIGHTWEIGHT DESIGN - This 3-post mount keeps the mask centered while adapting to a wider range of telescopes. The Bahtinov telescope focus mask is lightweight, so you do not disturb the balance of the scope.
5. Applicable Size The outer diameter of the Bahtinov mask supports the telescopic lens lens in the range of 100-140mm (with manual measurement, there is an error of 1-2mm).

Specification:
Item Type:Telescopic Focus Mask
Material: Acrylic
Thickness: approx. 2mm
Color:As picture show
Approximate weight: 21 g / 0.7 ounces.
The outer diameter size range of the telescopic lens is supported: approx. 60-90 mm / 2.4-3.5 inches (manual measurement error is 1-2 mm).

Package list:

3 x mounting accessories.

1 x Bahtinov mask.