Barkonian ATM RFT Refractor Project
Posted 30 June 2012 - 08:31 PM
Posted 01 July 2012 - 04:05 PM
Posted 03 July 2012 - 02:16 PM
You are right I should have put a sketch of the optical config in the article. Although I have described the way I went about it. It is basically all wood. I made this scope just before rushing off for a Venus transit trip to Northern Australia.
Note in the shot below one can see the three 32 mm screws which hold the back plate with secondary assembly in place.
Posted 03 July 2012 - 02:29 PM
Below is a shot of the method I used to set objective. note ; I used sandpaper shims as well well as blocks which were screwed down firmly when i was satisfied I was reasonably central.
Although this looks crude it was quite easy after carefully screwing in place then adjusting the secondary to get a laser beam and chesire cross hair collimator to show the optics were well aligned. I have been using this scope daily and it has retained good collimation.
Posted 05 July 2012 - 09:45 PM
Posted 07 July 2012 - 06:56 PM
I did consider making a spider but then thought cutting a 40 mm diameter circular piece of timber and mounting to a back plate was easier to fabricate.