John, Clive,
do you guys have a link?
Is this similar to what you describe?
http://www.ebay.com.au/itm/Digital-L...item2a37a57078
40cm long, 0.1 degree resolution.
I'm doing some dome renovations and I wanted to project laser lines
on the inside of my dome with fairly accurate angular accuracy.
I was thinking of strapping one of my dot lasers to one of them.
I was thinking of using the OTA but with a GEM it would be offset from
the dome centreline.
Linear accuracy not that important, just angular if you know what I
mean.
Steve