Jump to content


Photo

Post your home made scope

  • Please log in to reply
595 replies to this topic

#51 mconnelley

mconnelley

    Messenger

  • -----
  • Posts: 498
  • Joined: 14 Mar 2006
  • Loc: Hilo, HI

Posted 23 January 2013 - 02:36 PM

Hello:

Collimating the ballscope using the trusses is fairly easy, but a little different than a 'regular' Newtonian. On the plus side, there is no running back and forth since everything is done at the top end. If I get set up before dark, I use a regular Cheshire collimating tool to collimate the secondary and then the primary in the usual way, and that gets me pretty close. Then I look at a star to zero out the coma by adjusting the truss. I look at the star out of focus, and stick my hand into the beam and move it around until the shadow of my hand is on the 'thin' side of the donut (out of focus image of the star). I then know which way I need to move the truss. After a few iterations, the coma has been taken care of. Overall, I'd say that it's no harder than collimating a 'regular' f/4 Newtonian. The collimation seems to hold well throughout a night.

The reason I put the collimation at the top was to allow me to put the mirror farther back into the ball, thus helping balance. The hardware, plus room to allow for the adjustment, would have taken up about 1" of space back there. Also, since the mirror doesn't move relative to the ball, the mirror edge supports are glued to the inside of the ball, and aren't attached to the part of the mirror cell with the triangles and bars. So, from a certain point of view, the ball is also the frame for the mirror cell.

Cheers
Mike

#52 philipdo

philipdo

    Mariner 2

  • -----
  • Posts: 257
  • Joined: 06 Dec 2006
  • Loc: Flanders, Belgium, Europe

Posted 23 January 2013 - 03:10 PM

My trusted 200 mm F/D 20 Kutter Catadioptric Schiefspiegler. Wood & aluminum construction.

Attached Files



#53 idp

idp

    Messenger

  • -----
  • Posts: 454
  • Joined: 21 Aug 2009
  • Loc: New Haven, CT

Posted 23 January 2013 - 03:11 PM

Very interesting, thank you. You says that the collimation holds through the night, does it mean that you'll have to repeat it on the following observing night? Even if you do not disassemble the the telescope?

Ivano

#54 roscoe

roscoe

    curmudgeon

  • *****
  • Posts: 3291
  • Joined: 04 Feb 2009
  • Loc: NW Mass, inches from VT

Posted 23 January 2013 - 11:35 PM

Here's my 60mm f/16.... a Carton objective, long tube made by splicing together two tubes, vintage .965 focuser, dew shield made from a fire extinguisher, Meade alt-az mount found in a customer's basement, used aluminum tripod, now replaced with a home-made cherry wood model.

Attached Files



#55 kfiscus

kfiscus

    Vanguard

  • *****
  • Posts: 2117
  • Joined: 09 Jul 2012
  • Loc: Albert Lea, MN, USA

Posted 23 January 2013 - 11:55 PM

My redone rockerboard for my Z12. Shortened, lightened, prettified.

Attached Files



#56 kfiscus

kfiscus

    Vanguard

  • *****
  • Posts: 2117
  • Joined: 09 Jul 2012
  • Loc: Albert Lea, MN, USA

Posted 23 January 2013 - 11:59 PM

Side view of same. M31 and friends? Top hole (M32) is functional for C5 solar viewing scope, bottom hole (M110) is handle. Rides on dedicated Atomic EQ platform.

Attached Files



#57 Jim Curry

Jim Curry

    Surveyor 1

  • *****
  • Posts: 1556
  • Joined: 29 Oct 2007
  • Loc: STL

Posted 24 January 2013 - 12:07 AM

Rob:

As one critical observer noted "that the CA for an 4" f/12 was about as good as it gets. The rings were concentric and perfectly shaped" and " this looks lens like it was turned on a lathe, perfect star test images and as good as a 4" achromat can be. He was even speculating that maybe the glass was special and that this wasn't a Fraunhofer design to get such good correction."

It doesn't get better in a 4" than what this scope puts up. I built up a 6" f/12 Istar and I say the same thing.

Jim

#58 Crayfordjon

Crayfordjon

    Vendor - Zerochromat

  • *****
  • Vendors
  • Posts: 1845
  • Joined: 17 Jun 2009
  • Loc: UK

Posted 24 January 2013 - 03:36 AM

Six inch refractor made from cat food tins and plastic drain pipes, used for solar imaging.

Attached Files


  • mdowns likes this

#59 Bob Myler

Bob Myler

    Surveyor 1

  • *****
  • Posts: 1939
  • Joined: 18 May 2006
  • Loc: St Louis, MO

Posted 24 January 2013 - 04:03 PM

Six inch refractor made from cat food tins and plastic drain pipes, used for solar imaging.


Friskies, Fancy Feast - or Tender Vittles? :cool:

#60 titanio

titanio

    Mariner 2

  • -----
  • Posts: 267
  • Joined: 15 Feb 2009
  • Loc: Alicante, Spain

Posted 24 January 2013 - 05:37 PM

here is mine I will finish it soon

Posted Image
  • mdowns likes this

#61 titanio

titanio

    Mariner 2

  • -----
  • Posts: 267
  • Joined: 15 Feb 2009
  • Loc: Alicante, Spain

Posted 24 January 2013 - 05:46 PM

And this is my Super apo telescope I make with Russian optic

Posted Image

Uploaded with ImageShack.us

#62 Crayfordjon

Crayfordjon

    Vendor - Zerochromat

  • *****
  • Vendors
  • Posts: 1845
  • Joined: 17 Jun 2009
  • Loc: UK

Posted 25 January 2013 - 04:16 AM

Yeah! I supply the cat food tins, you gotta problem with that pal!

Attached Files



#63 astrobeast1

astrobeast1

    Vostok 1

  • -----
  • Posts: 162
  • Joined: 28 Sep 2010
  • Loc: leicester england

Posted 25 January 2013 - 05:24 AM

This is my little pair of binocular's--the mirror,s are 635mm

Attached Files


  • mdowns likes this

#64 Víctor Martínez

Víctor Martínez

    Messenger

  • -----
  • Posts: 484
  • Joined: 05 Feb 2007
  • Loc: Cadiz - Spain

Posted 25 January 2013 - 06:42 AM

go gadget! :bigshock: :bigshock:

#65 droid

droid

    rocketman

  • *****
  • Moderators
  • Posts: 7159
  • Joined: 29 Aug 2004
  • Loc: Conneaut, Ohio

Posted 25 January 2013 - 06:57 AM

where are the eps? thats super cool

#66 Ravenous

Ravenous

    Viking 1

  • -----
  • Posts: 518
  • Joined: 14 Nov 2009
  • Loc: UK

Posted 25 January 2013 - 07:03 AM

I love the winch and the blue string! (For elevation/ALT control?)

Looks like what I'd call a B&Q scope!

#67 StarWrangler

StarWrangler

    Viking 1

  • -----
  • Posts: 978
  • Joined: 03 Sep 2004
  • Loc: Three Rivers, MI U.S.A>

Posted 25 January 2013 - 09:57 AM

Way cool Astrobeast,

Looks a touch like Steampunk which I like.

is it hard to collimate?


Alan O.

#68 Crayfordjon

Crayfordjon

    Vendor - Zerochromat

  • *****
  • Vendors
  • Posts: 1845
  • Joined: 17 Jun 2009
  • Loc: UK

Posted 25 January 2013 - 10:01 AM

After I built my six inch scope from cat food tins I gained enough exprience to try a bigger scope, as you do. :roflmao: :roflmao:

Attached Files



#69 Ksearles62

Ksearles62

    Explorer 1

  • -----
  • Posts: 57
  • Joined: 26 Nov 2011
  • Loc: Medical Lake WA

Posted 25 January 2013 - 12:17 PM

Here is my 10" f5. Homemade from plywood and aluminum.

Attached Files



#70 droid

droid

    rocketman

  • *****
  • Moderators
  • Posts: 7159
  • Joined: 29 Aug 2004
  • Loc: Conneaut, Ohio

Posted 25 January 2013 - 01:04 PM

Kenny thats just purty , great job

#71 astrobeast1

astrobeast1

    Vostok 1

  • -----
  • Posts: 162
  • Joined: 28 Sep 2010
  • Loc: leicester england

Posted 25 January 2013 - 04:09 PM

Hi Victor --Droid --Ravenous---starwrangler-

my scope with two 635mm mirrors is called "Hexy" (the tubes are 16 sided=Hexadecagon shapes ) -it is F4.7--has fourteen, motors to control all aspects of Hexy's movement's ,pushbutton control box in eyepiece area , it has motorised sliding focusers/diagonal's ,-both tubes are pivoted to swing in 90 degree opposing direction,s to allow merging at the eyepiece,s
.
The alt/az is controlled by motors and special setting circles --the colour scheme is Black blue & Gold
(martian skies blue)
Have melted and polished my own mirror's The whole shebang including the aluminised mirrors has cost £1500.00.
Hexy is roughly equivalent to a 36 inch mirror due to the binocular format .
Collimation is a snip=very easy.
this is an old pic. but the eyepiece/ tertiaries are where the 50mm tube is coming out of the cages . Hexy is so well balanced on big bearings-I can literally move Her round and up and down with one finger .
Hope you all like her.

Attached Files



#72 Mirzam

Mirzam

    Skylab

  • *****
  • Posts: 4433
  • Joined: 01 Apr 2008
  • Loc: Lovettsville, VA

Posted 25 January 2013 - 04:37 PM

Here's a shot of my 14" travel scope in Chile, not too far from Cerro Tololo observatory.

JimC

Attached Files



#73 droid

droid

    rocketman

  • *****
  • Moderators
  • Posts: 7159
  • Joined: 29 Aug 2004
  • Loc: Conneaut, Ohio

Posted 25 January 2013 - 06:47 PM

Jim, nice scope , I still ,sometimes ,wonder at the fact that such a large scope is considered transportable , only a genration ago such a thing would have been impossible.

#74 idp

idp

    Messenger

  • -----
  • Posts: 454
  • Joined: 21 Aug 2009
  • Loc: New Haven, CT

Posted 25 January 2013 - 06:50 PM

This is my little pair of binocular's--the mirror,s are 635mm


:jawdrop: Awesome!!!!

#75 Rutilus

Rutilus

    Surveyor 1

  • -----
  • Posts: 1862
  • Joined: 17 Dec 2010

Posted 26 January 2013 - 03:20 AM

Wow!! superb scope builds everyone.

Here's my my build using a Carton 100mm f/13 lens.
Scope parts are made from M.D.F. board and plastic soil pipe.

Attached Files








Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics