Premium quality Bahtinov focus mask. These are not generic masks, each mask is tuned to the telescope's focal ratio for the very best performance . The Bahtinov mask has become the preferred method of focusing a telescope, either visually or when imaging with a CCD camera, DSLR or webcam.

I'm interested to hear how close, in microns, to perfect focus people are happy with for imaging. With the caveat that I don't have an auto focusser only a motorised one, the other night, before wind killed my session, i carefully checked focus using a Bahtinov mask and Bahtinov Grabber software. I'd second the above from @pfile - without auto focus, using a bahtinov mask and bahtinov grabber is a really easy and effective way of getting quick and accurate focus. It works best with a bright star, and if you are plate solving you can use sgp's focus and target positions to slew to and from a suitable star from your target - the help file has the details of how to do this. View ideiki.com,www.astroplace.net - APT - Introduction Home Download Screenshots Videos Purchase EOS matrix User's Guide History Support Forum Gallery APT - Astro Photography Tool v3.31 (released on 2017/02/13) (ne @@ -0,0 +1,13 @@ # Tri-Bahtinov mask cover generators This directory contains the python code for generating a Tri-Bahtinov mask cover for either the original Tri-Bahtinov mask or S. Takagi's improved Tri-Bahtinov mask. This customizable design generates custom Bahtinov masks, which are used to aid focusing telescopes during astrophotography. They are named after Paul Bahtinov, who developed the first designs. A Bahtinov mask creates diffraction spikes visible to the viewer, with each direction of slots in the mask corresponding to a spike. your Tube-Line Accumulator Grabber. You have purchased a dependable machine, but only by followed by specific instructions. These precautions are intended for the personal safety of you and those working with you. Please take time to read them. Follow t