In the past I have made a hartmann mask to help with focusing and had some success with it.
Recently I came across another focusing aid called a Bahtinov Mask which is similar in function to a Hartmann Mask but resolves some of the shortcomings.
I found a webpage which allows me to generate Bahtinov Masks for various sizes and with some trial and error was able to generate a mask for my DSLR.
I used a piece of stiff wire to hold it in place
A few years ago I built an artificial star using an LED and a fiber optic network cable. It works pretty well, here is an example of what collimating my C8 looks like.
I figured it would be a good test of not only the feasibility of a DSLR Bahtinov mask, as well as familiarize myself with its operation
|Slightly Extra Focus|
The results speak for themselves. Next step will be to test it under actual use conditions.
I think that a DSLR bahtinov might be not only overkill but slightly un-usable but I won't know until I give it a shot which probably won't be until this weekend.