Bahtinov Mask for 5 Euro

Finally got to give this first light. Unfortunately clouds and poxy night meant I could only test the focusing, but it seems to work. A clear night and a dark sky may may yet give me a chance to test it further. Sorry I haven't posted in a while, been up to my neck in work...........

Inside focus:


Proper focus:


Outside focus:


OK, so now its time to make a tricky small one for my 300mm lens.:S - looks like more cut fingers, bugger..: blink:

Very clear demonstration of the Bahtinov effect - congrats.
I attempted to make one 10 or so days ago - not so successful.
Not being particuarly DIY competant I attempted to print on paper - cut paper - laminate - cut laminated mask - and placed in a picture frame with four door stops screwed to frame. Plastic probably allows cleaner cuts so I shall revisit.

I could identify when target was in focus but not as precisely as the method promises (and possibly no better than alternative focuing methods) - I did not get the shifting pattern on either side of focus.

I think that clean sharp cuts are essential - and the glass of the picture frame probably wasn't helping either.

However, I believe milage may be had from the concept of using the picture frame and door stops to mount a mask.
Also if one can cut the backing material of a picture frame cleanly then one can have a rigid material ready made to fit the frame.

How did you mount your frame and would it be rigid?

Mark

How did you mount your frame and would it be rigid?

Mark - no frame used. The plastic is rigid enough not to require a frame. As for fixing it to the scope I simply used electrical tape. As your only going to be using it for a few minutes at a time this is sufficient for my purposes. I might try your doorstops fixed to the plastic as a permanent solution, but that might actually reduce the life of the mask as once I am finished it currently slips back into a pocket in the laptop bag.