Made proudly in Egypt

High Precision Double-line Focusing Mask for Astronomical Telescope (100/105/150)

375 EGP

Item: Double-line Fixed Diameter Focusing Mask

Material: Aluminum Alloy

Weight: 300 g

Color: Black

Features: High-precision Double-line

Function: Accurate Focus in Deep-space observation

Category:

Description

Product Parameter​s:

Item: Double-line Fixed Diameter Focusing Mask

Material: Aluminum Alloy

Weight: 300 g

Color: Black

Features: High-precision Double-line

Function: Accurate Focus in Deep-space observation

Mask Diameter Fixed Diameter 
60-85 mm 65-92 mm
80-105 mm ​  85-118 mm
100-130 mm 105-142 mm
105-145 mm 110-150 mm
120-150 mm  130-172 mm
140-175 mm 150-192 mm
160-195 mm 170-212 mm
180-220 mm 190-238 mm
220-240 mm  210-258 mm

How to choose the suitable diameter for your telescope?

1. The internal diameter of lens hood should be within the mask diameter range;

2. The external diameter of lens hood must be within the fixed diameter range.

3. The double-line focusing mask is usually used in dual-speed focus, over 5 times more sensitive and precision than single-line focusing mask.

Instructions:

1.Place the Focus-Mask over the end of your telescope, then locate a bright star near your target.

2. Take a 3-5 second picture and view the diffraction spikes.

3. Change your focus, take another picture and again, view your diffraction spikes.

4. Is the center spike moving further from center? Then change the direction your focusing and try another picture.

5. Watch the direction the spikes are moving and when the center spike passes the middle of the other two spikes.

6. Change direction and fine tune your tuning knobs until the center spike is in the middle.

7. You’re now in perfect focus.

Product Features:

1. Suitable for different caliber astronomical telescopes and camera lens;

2. Full alloy made with black for long life use;

3. 3pcs metal screws for fastening the focusing mask;

4. Metal screws with silicone mat for protecting the telescope lens.

Product Package:

1pc focusing mask

4pcs screws

Product Pictures:

10134

9111213

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