140 mm Focus Mask

Write a Review
Your Price: $34.00
Starfield 140mm Focus Mask
Part Number: FM-140
Availability: Back Order

Send to:

*We'll ask for shipping info at checkout

The Bahtinov mask is used focus small telescopes accurately. Although masks have long been used as focusing aids, the distinctive pattern was invented by Russian amateur astrophotographer Pavel Bahtinov.   


Simply place the mast in front of the main optic of your telescope and take a picture.  Look at the diffraction spike pattern and continue until the spikes are even.   Using a Bahtinov mask is the easiest way to get into focus.


This 140mm mask is great for 125mm - 130mm class telescopes


Fits dew shields with an outside diameter of 153-192mm

Related Items

160 mm Focus Mask
$39.00
Back Order
180 mm Focus Mask
$39.00
Back Order

Recently Viewed Items