Return to the Cloudy Nights Telescope Reviews home pageAstronomics discounts for Cloudy Nights members
· Get a Cloudy Nights T-Shirt · Submit a Review / Article

Click here if you are having trouble logging into the forums

Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User

Equipment Discussions >> ATM, Optics and DIY Forum

Pages: 1 | 2 | 3 | (show all)
David PavlichAdministrator
Transmographied
*****

Reged: 05/18/05

Loc: Mandeville, LA USA
Re: During the Great Recession new [Re: ed_turco]
      #5548602 - 12/01/12 11:17 AM

This has been a good thread. Let's back off a bit from the snarky remarks.

David


Post Extras: Print Post   Remind Me!   Notify Moderator  
droid
rocketman
*****

Reged: 08/29/04

Loc: Conneaut, Ohio
Re: During the Great Recession new [Re: David Pavlich]
      #5549704 - 12/02/12 01:10 AM

Ed; Im not an ATM , but I agree with you on the no credit cards, never had one, never will.
I pinch pennys, roll em too, lol, do with out, and make do.


Post Extras: Print Post   Remind Me!   Notify Moderator  
mikey cee
Postmaster
*****

Reged: 01/18/07

Loc: bellevue ne.
Re: During the Great Recession new [Re: droid]
      #5549733 - 12/02/12 01:58 AM

Andy your a blast. If everyone did it like you the US economy would be in another Great Depression! Mike

Post Extras: Print Post   Remind Me!   Notify Moderator  
Mark Harry
Vendor
*****

Reged: 09/05/05

Loc: Northeast USA
Re: During the Great Recession new [Re: mikey cee]
      #5549919 - 12/02/12 08:14 AM Attachment (17 downloads)

There's another reason to be 'conservative' in order to save money/procure non-conventional items. Here's an example, a dialyte refractor crown meniscus I've been piddling with. 8" diameter, and a total oddball not available anywhere. Who knows- I may re-invent the wheel!
M.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Mark Harry
Vendor
*****

Reged: 09/05/05

Loc: Northeast USA
Re: During the Great Recession new [Re: Mark Harry]
      #5550204 - 12/02/12 11:46 AM Attachment (14 downloads)

Another:

Post Extras: Print Post   Remind Me!   Notify Moderator  
Mark Harry
Vendor
*****

Reged: 09/05/05

Loc: Northeast USA
Re: During the Great Recession new [Re: Mark Harry]
      #5550207 - 12/02/12 11:48 AM Attachment (18 downloads)

And here's the focusing end: cobbed together out of a short focus achro, and 45* diagonal- sitting on top of a woodpile of scraps-

Post Extras: Print Post   Remind Me!   Notify Moderator  
Mark Harry
Vendor
*****

Reged: 09/05/05

Loc: Northeast USA
Re: During the Great Recession new [Re: Mark Harry]
      #5550231 - 12/02/12 12:04 PM

The only thing I haven't got, is a pic of the 'target'. it's a scrap steel guard, painted white, and has lines .025" ruled in 2 directions, black dots of various sizes from .050"-.005"~, a grid pattern of 1/8" dots, and a dollar bill glued on for detail. It's screwed to the barn around 30 yards away from the objective. At present, it's set up like Crayfordjohn's Hypo. And yes, it -DOES- work... though there is a very small central area within the fov that has relatively little color of note. I need to make at least 1 more negative flint lens to try to exploit a couple ideas for improvement. I estimate rez to be somewhere around a 70-80mm std achro as it sets now, with a heck of a lot more light throughput.
Call it a big refractor on a budget; during 'hard' times!

Lots of fun to tinker with. Only have one side of the objective (cx) smoothed to 1/4 wave or less error, so quite a bit more work to go. The concave side is dummy-shined, but not smoothed yet.
M.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Crayfordjon
Vendor - Zerochromat
*****

Reged: 06/17/09

Loc: UK
Re: During the Great Recession [Re: Mark Harry]
      #5553309 - 12/04/12 03:41 AM Attachment (15 downloads)

Mark is right a hypo does work. I have been improving the technique of using Hypos as imaging scopes, with a lot of success. This image was taken with a totally chromatic set of lenses, IE no flints anywhere, the set up is an F:7 12 inch singlet OG and a six inch short focus singlet about half way along the focal length. I have totally broken away from the "ol rut" of doing everything only with lenses, and instead used a crude imaging lens set and processing in the computer. This is the way forward gentlemen. My mind set in optics has been formed by the axiom "Occams razor" a nescessity when trying to make sophisticated scopes just after the war in the UK, when nothing but ex gov junk was to be had.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1 | 2 | 3 | (show all)


Extra information
13 registered and 26 anonymous users are browsing this forum.

Moderator:  ausastronomer, richard7, Starman81 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 2910

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics