Bahtinov mask for a 4" retractor.

[archioptic]

Anyone have a spare one lying around somewhere?

[pfitzgerald]

Hi Nathan

You could use the information from the following website to make your own.

http://astrojargon.net/maskgen.aspx?AspxAutoDetectCookieSu pport=1

Paul

[archioptic]

Thanks Paul, that might be the way to go.

[pfitzgerald]

Cheers. It's pretty easy to do - albeit time consuming and you need a steady hand.

I've made a couple, both for ED120 refractors, and I used the black plastic from one of those el cheapo display folders from Woolies. I printed the template out on paper, cut around the outside of it then stuck it onto the plastic with sticky tape and went cross-eyed cutting out all the bits using an exacto craft knife using a metal ruler as a guide.

Works a treat too.

Paul