MarkAR Posted January 24, 2021 Share Posted January 24, 2021 Came across this website a few days ago and thought their approach for large refractors was quite ingenious.http://www.zerochromat.net Quote Link to comment Share on other sites More sharing options...
KevS Posted February 6, 2021 Share Posted February 6, 2021 The design is as you say "quite ingenious". Very reminiscent of the old Unitron folded refractor; think they only did a 3" but stand to be corrected. The idea of a 21" frac seems enthralling, but I hasten that justifying the $300,000 for "command" approval would take some doing. 1 Quote Link to comment Share on other sites More sharing options...
MarkAR Posted February 6, 2021 Author Share Posted February 6, 2021 Yup the 21" is a bit overkill, maybe the 10" at £16K might interest you 🤣 Quote Link to comment Share on other sites More sharing options...
Stub Mandrel Posted February 6, 2021 Share Posted February 6, 2021 (edited) John Wall, inventor of the Crayford Focuser made a 30" Zerochromat, the biggest refractor ever made by an amateur and the fifth/seventh/eighth (depending on who you believe) largest refractor ever built. It's currently at the Hanwell Community Observatory*. John Wall http://www.hanwellobservatory.org.uk/telescopes/john-wall *This scope is mentioned but not detailed on the Zerochromat website. Edited February 6, 2021 by Stub Mandrel 1 Quote Link to comment Share on other sites More sharing options...
KevS Posted February 7, 2021 Share Posted February 7, 2021 On 2/6/2021 at 3:47 PM, MarkAR said: Yup the 21" is a bit overkill, maybe the 10" at £16K might interest you 🤣 If I was forking out that much on a hobby, it would have sails.😂 2 Quote Link to comment Share on other sites More sharing options...
MarkAR Posted February 8, 2021 Author Share Posted February 8, 2021 Just thinking if folding the light path similar to this on a newtonian would work, it would place the eyepiece at the back along a second tube making it easier when viewing on an EQ mount. Quote Link to comment Share on other sites More sharing options...
Tom Corbett Posted November 8, 2021 Share Posted November 8, 2021 On 2/8/2021 at 12:59 PM, MarkAR said: Just thinking if folding the light path similar to this on a newtonian would work, it would place the eyepiece at the back along a second tube making it easier when viewing on an EQ mount. There are off axis Newts that do not have a secondary obstruction. I had one for a long time. In my opinion it was comparable to a refractor of equal aperture. DGM Optics http://users.erols.com/dgmoptics/ Quote Link to comment Share on other sites More sharing options...
MarkAR Posted November 9, 2021 Author Share Posted November 9, 2021 18 hours ago, Tom Corbett said: There are off axis Newts that do not have a secondary obstruction. I had one for a long time. In my opinion it was comparable to a refractor of equal aperture. DGM Optics http://users.erols.com/dgmoptics/ Never knew they existed, interesting stuff. Quote Link to comment Share on other sites More sharing options...
Nightspore Posted November 10, 2021 Share Posted November 10, 2021 If I was forking out that much on a hobby I would expect it to achieve orbit under its own power. 2 Quote Link to comment Share on other sites More sharing options...
MarkAR Posted November 12, 2021 Author Share Posted November 12, 2021 On 11/10/2021 at 12:59 AM, Nightspore said: If I was forking out that much on a hobby I would expect it to achieve orbit under its own power. Well we know that Hubble is getting on in years, wonder how much they want for a used scope. 🤣 Quote Link to comment Share on other sites More sharing options...
Nightspore Posted November 12, 2021 Share Posted November 12, 2021 33 minutes ago, MarkAR said: Well we know that Hubble is getting on in years, wonder how much they want for a used scope. 🤣 Depends if it's in stock, or not, I reckon. 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.