Hartmann Mask

[TrevorW]

Motivated by Dennis's thread but not having the equipment to try building one, I stuck to the old Hartmann design and spent a lazy cloudy Saturday afternoon making the attached from 4mm MDF for my 80ED.

The holes are round it's just shadows causing the distortion

Cheers

[Dennis]

Nice work Trevor!

Cheers

Dennis

[Gama]

Put some line across each hole, this will increase the accuracy humangulsly.
Then you use the diffraction spikes to focus.
Theres plenty of info out there on it.

Theo.