The Bahtinov mask has become the preferred method of focusing a telescope, either visually or when imaging with a CCD camera, DSLR or webcam. Precise and repeatable focus can be achieved in under a minute, even in poor seeing conditions. The mask displays a unique diffraction profile, one part of the diffraction pattern moves in response to changes in focus and displays error as a displacement from a clearly defined point.
Straight sides ensure the focus mask will not roll away when stored on the shelf, matt-black surface prevents reflections and a reflective high visibility corner makes it easy to locate in the dark.
Credit goes to Russian amateur astronomer Pavel Bahtinov for creating the design and making it available to the astronomy community.
|Average Rating (28 Reviews): |Star sharp for Takahashi fsq-85 ed
Monday, 18 January 2021 | Vincent
As N engineer i was expecting at least a plastic mask!
What was received was MDF with 3 holes in the wrong positions. So have modified to work, do not allow this product to get damp or wet as will be rendered usless.
First rate service from FLO
Tuesday, 12 January 2021 | Owen
Item was delivery very promptly given the current situation. Very good quality product. Not used it yet as still waiting for mount to arrive. However it looks like it should be very good.
Tuesday, 3 November 2020 | Udi
That Bahtinov mask is working properly, and I managed to perfectly focus the stars with it. Thank you!
Great service and does exactly what it's supposed to do
Friday, 30 October 2020 | Rob
Feels solid enough, hangs off the dew shield no problem and does the job! Arrived within 2 days
StarSharp Bahtinov Focus Masks
Thursday, 29 October 2020 | William
Makes focus a very easy matter. The diffraction spikes are very clear from any bright star.
These are made from a robust material that can take the occasional drop onto the floor.
I use a 2nd cloned screen from my warm room display relaying the output from my camera up beside the mount. (yep ....still using manual focus).
Looping a focus plan from APT and the scope on a bright star the screen refreshes every few seconds displaying a very clear pattern to get very accurate focus before setting off taking images. (The bigger screen being better than just the on camera small screen to get exact focus).
You need one of these in your life!
Wednesday, 22 July 2020 | Paul
I always thought I was pretty good at "eyeballing" focus. Visually I think I get close enough... I got quite a shock when it came to imaging! Even with the 2 speed focuser on my scope I always managed to be a little off.
I was always familiar with Bahtinov masks as I have one for me EvoStar 120. As I had not used a scope in 6 or so years, I forgot how important they are.
Find a brightish star, pop the mask on and balance the spikes and you are good to go. Focusing takes seconds and once dialled in your able to image with confidence.
Don't even think about not buying one, or that somehow you'll get by - my mask is probably one of the most important purchases since upgrading my scope.
It's simple, effective and satisfying to use. What's not to like?
Makes focusing 10 times easier!
Sunday, 5 July 2020 | Kristoffer
Got this with my first telescope purchase, and it is worth every penny, just zoom in on the brightest star one can find, then slip the mask over the telescope, and make align the bahtinov spikes (if that is what they are called), boom, you have prime focus!
Remember that using if using a filter for imaging, to have the filter on when doing this, because that changes the focal point ever so slightly, it can be a bit hard if the filter is very restrictive, like certain wavelengths, one might have to resort to taking a few second exposures for each focusing-try, because it wont be enough light passing thru to show on the preview on the camera, I am sure this is adjustable in some cameras perhaps though! I recommend zooming digitally in on the live view to get the best view
The mask has three holes in it, and is supplied with two nylon screws, which is enough to let the mask rest easy on the telescope (you will not need to attach it very sturdily, it is enough to have it rest flushly against the telescope opening usually it stays on for maybe 5 - 20 minutes, depending on filter use, if I am struggling to find a bright star etc etc.. it is quick work after a few sessions!
It is made of cardboard, I did notice some of it starting to separate and fall off along the edges, so it looks a bit more rough now, I usually lay it on the ground if I am working quick and dont have any space nearby to lay it, but even so just catching the edge will make the paint come off an reveal the cardboardy interior of the mask, but it doesn't have any effect of the use of it. It would be better to have it in some kind of robust plastic instead of cardboard-ish material. But it does the job, absolutely worth the buy!
StarSharp Bahtinov Focus Masks
Wednesday, 24 June 2020 | Garry
Does what I need it to do, screw plastic screws into mask put on scope simple. Quick delivery time as always.
POORLY DESIGNED AND DOESN'T FIT
Thursday, 19 December 2019 | John
Bought this item for my Esprit 150, I expected that it would be designed to fit over the dew cap of my Esprit 150 which has a diameter of 203mm, instead it is a flat piece of rigid plastic with 3 holes drilled in it, and supplied were 2 (not 3) threaded plastic pins, which I assume are designed to hold the mask in place over the dew cap, in any event the holes were drilled in the wrong place.
Not at all what I was expecting,I will be returning the item for a refund.
Used on an SW ED80 DS-Pro
Tuesday, 29 October 2019 | Lee
Performs exactly as expected and is a great help assisting with focusing. Taking stock of other comments about potential structural weakness, I've been careful handling... but it feels solid.
Read all 28 customer reviews...