I use that as the secondary mirror to my Gregorian telescope build. F-4.5 13inch mirror plus F-4 4inch gives F-20. The focus is a bit soft but is does good on the full moon. Well I think I used the Orion but close enough.
Great review. I noticed that your primary mirrow was center spotted. Did you add that? I added it to mine, and collimation was off. I removed the primary mirror and took some wire cutters and where the holes are on the tube, I cut the back part of it off, thus allowing the primary mirror to slide backward on any part of it. I did collimate the secondary mirror first. It wasn't off my much. It may have improved the views very slightly. Keeping the magnification between 15x and 20x does help. 40x is about the limit for this little scope.
Yes I did! Just for fun, but using a laser collimator and getting it dialed in with loosening the back screws and a drop of glue to hold whatever tilted position was perfectly collimated, it produces really decent reviews. On mine the lower power is a bit more challenging for focus but when I put something higher in like a 15mm or 10mm eyepiece, the image is sharp and quite pleasant. It’s fun to scan the Milky Way with this at a dark site since it weights practically nothing.
I use that as the secondary mirror to my Gregorian telescope build. F-4.5 13inch mirror plus F-4 4inch gives F-20. The focus is a bit soft but is does good on the full moon. Well I think I used the Orion but close enough.
I found one at a thrift store that missing the knob that hold the tube to the base. Do you know what size that knob is? Thanks
Great review. I noticed that your primary mirrow was center spotted. Did you add that? I added it to mine, and collimation was off. I removed the primary mirror and took some wire cutters and where the holes are on the tube, I cut the back part of it off, thus allowing the primary mirror to slide backward on any part of it. I did collimate the secondary mirror first. It wasn't off my much. It may have improved the views very slightly. Keeping the magnification between 15x and 20x does help. 40x is about the limit for this little scope.
Yes I did! Just for fun, but using a laser collimator and getting it dialed in with loosening the back screws and a drop of glue to hold whatever tilted position was perfectly collimated, it produces really decent reviews. On mine the lower power is a bit more challenging for focus but when I put something higher in like a 15mm or 10mm eyepiece, the image is sharp and quite pleasant. It’s fun to scan the Milky Way with this at a dark site since it weights practically nothing.
Interesting.
The one I had wasn’t worth $20
No it’s not! Couldn’t see anything everything was all blurry!