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Specifications
- Brand Name: CSO
- Origin: CN(Origin)
- Type: Monocular
CSO Special purpose for refraction 60mm double separating objective lens diy for astronomical telescope
Price history
- for 3 month
- for half a year
- Requires Alitools extension
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Customer Reviews
Fantastic lens. Instructions included are really simple to understand. seller includes a 60mm gasket to keep the lenses slightly separated when fitted. The glass is optically clear and you can see the green coating on the lens. I'm impressed.
Ordered on 22nd Oct 2020 and received on 3rd Nov 2020, only 11 days and that is impressive. Not only that the green film coated lenses are well packed in bubble bags and cushioned with foam pieces in 2 thick cardboard boxes (box within a box). I am glad that they did that because the bigger outer box was a little crashed, but the inner box cushioned by foam pieces were intact. The lenses were in perfect order. I cleaned them up painted the rims black to reduce internal reflection and tested them up. The color were better and brighter than the original blue film lenses that came with the telescope that I also painted the rims black, but not as sharp that I think can be improve by replacing the spacer with a thinner home made black paper spacer like the one I had on my blue film lenses. Overall perfect!
After replacing the supplied plastic spacer or washer that measured 0.24mm thick to a home made black art paper spacer or washer that measured 0.19mm shown in picture 2, the sharpness did indeed improved due to the reduced air gap of 0.03mm as shown in the last picture. Yes I know that I need to improve on the camera setting to reduce digital noise, but that will take some time for a camera as old as the telescope. Now I really enjoy this telescope that cost me S$47.90 (about US$34.35) in 2007 together with the green film objectives that cost S$35.11 (US$20 with shipping) here for nature photography out of my pandemic window.