Jump to content


Photo

Jaegers objective

  • Please log in to reply
303 replies to this topic

#226 martym

martym

    Sputnik

  • *****
  • Posts: 46
  • Joined: 15 Feb 2010

Posted 18 March 2013 - 07:25 AM

Mel, it may prove more difficult assembling the GJD while traveling down the highway then doing a stationary build in a garage. LOL

marty

#227 dawsonian2000

dawsonian2000

    Surveyor 1

  • *****
  • Posts: 1648
  • Joined: 26 Jul 2006
  • Loc: Riverview, FL, USA

Posted 18 March 2013 - 07:06 PM

True, true... :grin: :lol:

#228 dawsonian2000

dawsonian2000

    Surveyor 1

  • *****
  • Posts: 1648
  • Joined: 26 Jul 2006
  • Loc: Riverview, FL, USA

Posted 23 March 2013 - 01:23 AM

I accomplished another baby step in the build of the GJD refractor. With the out-gassing of the main tube and dew shield nearly complete, I performed a test fit of the two tubes along with the hammer-finished painted transition piece to see how the components would fit together. I was impressed with the fit and trim of partial assembly! Here is a shot of the assembly from a short distance. It will be disassembled for further out-gassing of the tubes.

Mel

Attached Files



#229 dawsonian2000

dawsonian2000

    Surveyor 1

  • *****
  • Posts: 1648
  • Joined: 26 Jul 2006
  • Loc: Riverview, FL, USA

Posted 23 March 2013 - 01:24 AM

...here is a closer view. Considering the tubes were painted by means of a spray can, the finish turned out great!

Mel

Attached Files



#230 neo

neo

    Surveyor 1

  • *****
  • Posts: 1642
  • Joined: 12 Feb 2008
  • Loc: Iasi, Romania

Posted 23 March 2013 - 09:37 AM

Superb looking refractor :waytogo:, very nice finish!
Why so much out-gassing though? Do you think it could damage the lens? :question:

#231 dawsonian2000

dawsonian2000

    Surveyor 1

  • *****
  • Posts: 1648
  • Joined: 26 Jul 2006
  • Loc: Riverview, FL, USA

Posted 23 March 2013 - 08:06 PM

Superb looking refractor :waytogo:, very nice finish!
Why so much out-gassing though? Do you think it could damage the lens? :question:


Hi neo!

No, I do not think it would damage the objective at all. The reason I am allowing so much time to allow the tube to out-gas is because it develops a rock hard finish. Over the years, I have noticed that even though my painted projects are dry to the touch, the durability of the paint has the consistency of hard rubber in density. Therefore, being a very patient individual :smirk: ;) :grin: allows me to let the tube fully out-gas until I can hardly smell any fumes emanating from its surface. I hope this clarifies my reasons for thorough out-gassing.

Mel

#232 bremms

bremms

    Mercury-Atlas

  • *****
  • Posts: 2528
  • Joined: 31 Aug 2012
  • Loc: SC

Posted 24 March 2013 - 12:16 AM

Yes, Spray paint takes weeks without baking to harden. Paint is soft, adhesion is poor. two part paints are great but you need a gun to put them on.

#233 neo

neo

    Surveyor 1

  • *****
  • Posts: 1642
  • Joined: 12 Feb 2008
  • Loc: Iasi, Romania

Posted 24 March 2013 - 04:44 AM

Aha now it makes sence :grin:. Thanks Mel for clarification. Didn't know that spray paint takes so much to cure :ooo:.

Once again gorgeous looking scope!

#234 dawsonian2000

dawsonian2000

    Surveyor 1

  • *****
  • Posts: 1648
  • Joined: 26 Jul 2006
  • Loc: Riverview, FL, USA

Posted 24 March 2013 - 02:35 PM

You are quite welcome, neo! I guess it all depends on how you are going to use the painted item. If an item is handled little, I can see you putting it to work within a week after painting. But, since a refractor's tube is handled quite a bit during a normal observing session, I presume letting the tube out-gas as long as a month or more; depending on temperature and humidity conditions.

Mel

#235 dawsonian2000

dawsonian2000

    Surveyor 1

  • *****
  • Posts: 1648
  • Joined: 26 Jul 2006
  • Loc: Riverview, FL, USA

Posted 26 March 2013 - 08:00 PM

Yes, Spray paint takes weeks without baking to harden. Paint is soft, adhesion is poor. two part paints are great but you need a gun to put them on.


Hey bremms!

I wish I had the right setup to do a great two-part paint job. Epoxy base paints are fast curing and ultra hard.

Mel

#236 dawsonian2000

dawsonian2000

    Surveyor 1

  • *****
  • Posts: 1648
  • Joined: 26 Jul 2006
  • Loc: Riverview, FL, USA

Posted 07 April 2013 - 07:27 AM

With the main tube's out-gassing complete, I purchased and test fitted all of the hardware on the lens cell and focuser components, which both will possess collimation capability. Most of the hardware is metric-M6, with the exception of the Phillips-head screws attaching the focuser to its collimation ring being metric-M5's. All are stainless steel.

My next step will be to make a pair of handles for maneuvering the scope.

Mel

Attached Files



#237 dawsonian2000

dawsonian2000

    Surveyor 1

  • *****
  • Posts: 1648
  • Joined: 26 Jul 2006
  • Loc: Riverview, FL, USA

Posted 10 April 2013 - 06:57 PM

Using some scrap pieces of 3/4" solid red oak, I fabricated a couple of supports for the stainless steel bar handles that will be attached opposite one another at the focuser end of the main tube for maneuvering the scope. For better stability of the bar handles, I drilled recessed holes in the oak supports for them to sit in. Once I have sanded the oak supports and seal them with marine-grade spar varnish, the assemblies will be mounted to the main tube from the inside.

Mel

Attached Files



#238 martym

martym

    Sputnik

  • *****
  • Posts: 46
  • Joined: 15 Feb 2010

Posted 11 April 2013 - 06:50 AM

Yes, I like the idea of grab handles on a refractor. I also put one on my 6" f/15 folded refractor and my 5" f/8 refract.

marty

#239 neo

neo

    Surveyor 1

  • *****
  • Posts: 1642
  • Joined: 12 Feb 2008
  • Loc: Iasi, Romania

Posted 11 April 2013 - 08:19 AM

Looking good Mel! :waytogo:

I almost forgot about a handle on my baby Jaegers :foreheadslap:. I have to do something about it while I still can :p

#240 mikey cee

mikey cee

    Cosmos

  • *****
  • Posts: 7990
  • Joined: 18 Jan 2007
  • Loc: bellevue ne.

Posted 11 April 2013 - 09:50 AM

Yeah Mel you gotta' have grab handles on a refractor. It's the law of the land! :grin: Mike

#241 bremms

bremms

    Mercury-Atlas

  • *****
  • Posts: 2528
  • Joined: 31 Aug 2012
  • Loc: SC

Posted 11 April 2013 - 11:18 AM

I feel left out. None of mine have handles. I just finished a 5" F5 refractor Originally designed with a Jaegers lens. I had a cemented 130mm dia Melles Griot Achro with about the same FL. Writing on the side indicated it was 10/20 scratch dig and better than 1/3 wavefront P-V. It has slightly better images than the Jaegers. The image is also brighter since it has 97.5% transmission 500-700nm and The Jaegers is uncoated and air spaced. So it ends up about 82%. Both lenses are good for an F5.
My 6" F10 is next!
Here is a link to a picture of my 5" F5 "The Stump"
http://www.cloudynig...89322-stump.jpg

#242 dawsonian2000

dawsonian2000

    Surveyor 1

  • *****
  • Posts: 1648
  • Joined: 26 Jul 2006
  • Loc: Riverview, FL, USA

Posted 11 April 2013 - 11:05 PM

Yes, I like the idea of grab handles on a refractor. I also put one on my 6" f/15 folded refractor and my 5" f/8 refract.

marty


Grab handles are :cool: !!! When I thought about having to maneuver the GJD, it came to mind that the tube (being 7" inches in diameter) would be difficult to grasp with one hand. I think I will add some to my 4" f/13 and 5" f/9.4 too.

Mel

#243 dawsonian2000

dawsonian2000

    Surveyor 1

  • *****
  • Posts: 1648
  • Joined: 26 Jul 2006
  • Loc: Riverview, FL, USA

Posted 11 April 2013 - 11:08 PM

Looking good Mel! :waytogo:

I almost forgot about a handle on my baby Jaegers :foreheadslap:. I have to do something about it while I still can :p


Get those handles, neo! You'll be glad you did! :D

Mel

#244 dawsonian2000

dawsonian2000

    Surveyor 1

  • *****
  • Posts: 1648
  • Joined: 26 Jul 2006
  • Loc: Riverview, FL, USA

Posted 11 April 2013 - 11:10 PM

Yeah Mel you gotta' have grab handles on a refractor. It's the law of the land! :grin: Mike


Hey Mikey! I even thought about a steering wheel! :lol:

Mel

#245 dawsonian2000

dawsonian2000

    Surveyor 1

  • *****
  • Posts: 1648
  • Joined: 26 Jul 2006
  • Loc: Riverview, FL, USA

Posted 12 April 2013 - 12:35 AM

I feel left out. None of mine have handles. I just finished a 5" F5 refractor Originally designed with a Jaegers lens. I had a cemented 130mm dia Melles Griot Achro with about the same FL. Writing on the side indicated it was 10/20 scratch dig and better than 1/3 wavefront P-V. It has slightly better images than the Jaegers. The image is also brighter since it has 97.5% transmission 500-700nm and The Jaegers is uncoated and air spaced. So it ends up about 82%. Both lenses are good for an F5.
My 6" F10 is next!
Here is a link to a picture of my 5" F5 "The Stump"
http://www.cloudynig...89322-stump.jpg


Hey Marc!

With scratch-dig and wavefront specs like those for your 130mm, handles would be the last thing I would be worried about being left out on. :o :bow: :bow: Do you still have this achro?

BTW - My next refractor is going to be a 6" f/5, but it is not a Jaegers achro (as far as I can tell). It is going to look much like "The Stump" in that it will also utilize the same model Astro-Physics R&P focuser. But, I am not sure as to when I am going to start the project, because I have a unique pillow-block EQ project that I will be doing after the 6" f/10 GJD refractor is done.

I look forward to seeing your 6" f/10 build! How soon will you be starting?

Mel

#246 BarabinoSr

BarabinoSr

    Apollo

  • *****
  • Posts: 1486
  • Joined: 17 Nov 2005
  • Loc: Slidell La

Posted 12 April 2013 - 03:43 AM

Looking professional as usual Mel! Now ya got me wantin' to stick handles on my 4.5 f/10 Jaegers. I also cant wait to follow progress on the mount. Superb! Bambina :waytogo: :waytogo: :waytogo:

#247 dawsonian2000

dawsonian2000

    Surveyor 1

  • *****
  • Posts: 1648
  • Joined: 26 Jul 2006
  • Loc: Riverview, FL, USA

Posted 12 April 2013 - 08:35 AM

Thanks G :cool:!

Speaking of Gary's EQ build, here is a link to it everyone can enjoy: Gary's Pillow-Block EQ Build Another great project indeed! Awesome job G :cool:!

Mel

#248 bremms

bremms

    Mercury-Atlas

  • *****
  • Posts: 2528
  • Joined: 31 Aug 2012
  • Loc: SC

Posted 12 April 2013 - 09:59 AM

The Melles Griot Achro has permanent place in the stump. I do still have the Jaegers which is pretty good and has better zone correction. I'm going to sell the Jaegers lens as I seem to have collected a bunch of Achros from 80mm to 150mm. I did get a 150mm 1000mm FL with the 130mm. The 150mm is a cemented Melles Griot as well but has no specs written on the side of the lens other than FL diameter and part#. It was a lens( both were) as the largest one in the catalogs is 101mm in diameter. I may have a pic of the 150mm on my phone

#249 bremms

bremms

    Mercury-Atlas

  • *****
  • Posts: 2528
  • Joined: 31 Aug 2012
  • Loc: SC

Posted 12 April 2013 - 10:03 AM

Pic of the 150mm

Attached Files



#250 dawsonian2000

dawsonian2000

    Surveyor 1

  • *****
  • Posts: 1648
  • Joined: 26 Jul 2006
  • Loc: Riverview, FL, USA

Posted 12 April 2013 - 01:33 PM

Once I have sanded the oak supports and seal them with marine-grade spar varnish.


I have changed my mind about painting the oak supports for the bar handles with spar varnish and decided to go with the same finish I used on the focuser back-plate and lens cell; Rustoleum's black hammered finish.

Mel

Attached Files








Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics