Farpoint FP400 Bahtinov Focus Mask for Telescopes with Dew Shield or Front End Diameter from 2.5" to 4.5"

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About Farpoint FP400

Bahtinov Focus Masks...
• In 2008 an amateur telescope maker and astronomer published an ingenious new way to easily focus your DSLR, webcam or CCD camera for taking astrophotos. The method is simple, very intuitive and the device has universally been named after the inventor. The Bahtinov Mask.

• Farpoint manufactures this *LIFESAVING* astrophotography tool out of virtually indestructable ABS plastic and comes in two major types and in a range of sizes.

• One mask is a general purpose mask designed to fit refractors and newtonian telescope. The other mask is designed to fit Schmidt Cassegrain telescopes. Both types of mask are available in a range of sizes to cover your needs.

Farpoint FP400 Features

  • Bahtinov focus mask for small telescopes
  • Fits telescopes with dew shield or tube diameter from 2.5" to 4.5" diameter

Farpoint FP400 Reviews

Reviewed by 2 customers


Works as promised


from northeast  -  Casual/ Recreational

I use this to focus my guidescopes. To get the best guiding performance, one needs to defocus the scope slightly to wash out star twinkle to reduce unnecessary guiding corrections. This mask allows you to precisely adjust your scope for maximum guiding efficiency.


Works like a charm


from Alabama

This focus mask makes focusing really easy. Using Live view on my DSLR makes for super fast focusing. This mask is easy-on, easy-off. Just have to remember to take it off for the real pictures.


Questions & Answers Powered by TurnTo®

Questions about this item:

Mike D  Would this mask work with a SLR mirror lens, such as a 500mm f/8 Vivitar Lens? Thanks, Mike
MARTIN C  Hi Mike, Most likely it would, as long as the diameter of the front element does not exceed 4.5 inches. However, most SLR mirror lenses have a clear mark for infinity focus, which in general you can trust. At the price Adorama offers it, I would not hesitate in simply trying it out. Hope that helps! Martin
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