Lunt 50 with >100mm Lense
Posted: Thu May 04, 2017 5:16 pm
Hello all,
So after studying this for a bit I've hatched a new scheme to get more resolution. Please chime in!
I'd like to add resolution to my Lunt 50mm by:
1) removing the objective lens.
2) Extend the tube -- I've got lots of thoughts for this but nothing concrete yet.
i) One idea is to get a threaded aluminium tube the same diameter as the double stack. Use it to connect the objective end, to a lunt filter telescope adapter. Then attach the adapter to an aluminium tube
3) add a new larger diameter F/7 lens to the end of the tube.
4) add an ERF
I'm not having much luck fnding a large F7 lens though. I've found F7.8,6.5 etc. Does anyone know where I can buy one? Or does anyone know what F value would be close enough?
Looking through http://alag3.mfa.kfki.hu/astro/giantlenses/127mm.htm I find several, but have no idea how to buy one. The links all seem dead, or not meant for purchasing by mortals.
This one is 7.3, and pretty cheap...
http://www.telescope.com/Telescopes/Ref ... 103111.uts
This one is 6.3 and also cheap...
http://www.telescope.com/Telescopes/Ref ... 116659.uts
Jamie
Jamie
So after studying this for a bit I've hatched a new scheme to get more resolution. Please chime in!
I'd like to add resolution to my Lunt 50mm by:
1) removing the objective lens.
2) Extend the tube -- I've got lots of thoughts for this but nothing concrete yet.
i) One idea is to get a threaded aluminium tube the same diameter as the double stack. Use it to connect the objective end, to a lunt filter telescope adapter. Then attach the adapter to an aluminium tube
3) add a new larger diameter F/7 lens to the end of the tube.
4) add an ERF
I'm not having much luck fnding a large F7 lens though. I've found F7.8,6.5 etc. Does anyone know where I can buy one? Or does anyone know what F value would be close enough?
Looking through http://alag3.mfa.kfki.hu/astro/giantlenses/127mm.htm I find several, but have no idea how to buy one. The links all seem dead, or not meant for purchasing by mortals.
This one is 7.3, and pretty cheap...
http://www.telescope.com/Telescopes/Ref ... 103111.uts
This one is 6.3 and also cheap...
http://www.telescope.com/Telescopes/Ref ... 116659.uts
Jamie
Jamie