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Equipment Discussions >> Refractors

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mikey cee
Postmaster
*****

Reged: 01/18/07

Loc: bellevue ne.
Re: Istar refractors Pros and Cons? [Re: mikey cee]
      #5779699 - 04/05/13 02:04 PM

Where's a professor Irwin Corey when you need them?? Mike

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stanislas-jean
Carpal Tunnel


Reged: 10/22/08

Re: Istar refractors Pros and Cons? [Re: tomcody]
      #5779717 - 04/05/13 02:16 PM

Thanks for your post.
What I mean is that the laboratory needs to be independant and this is not the matter of reputation only.
Here in France we have so many labs that produce for what you pay and ask.
The only way to get something neutral and technical with total independance is to go to National Labs that produce actual results without any possible interpretation of the results.
Otherwise this shall a big fight for getting nothing at the issue, so an "OK Corall" of this famous american werstern movie.
The right solution can be also the performance of roddier tests on optics performed by observators themselves. As T.R. suggested, as me. You will have results with indications that will represent the actual level of the optics.
When completed with a serious ronchi test and a star test you will be confortable.
Star parties can be the right support, that will bring a lot to all by the exercise of tests and discussions about honestly.
No commercial matters involved through.
Stanislas-Jean


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tomcody
Pooh-Bah
*****

Reged: 07/06/08

Loc: Titusville, Florida
Re: Istar refractors Pros and Cons? [Re: stanislas-jean]
      #5779797 - 04/05/13 02:48 PM

Stanislas-Jean,
Thank you for that detailed response and I agree with you that field testing by observers themselves is probably the best test of all as it is done on many scopes by many owners not just one lens sent to a lab.
I personally would rather buy a mid-priced scope like an Istar based on the good reports of many owners than on one sample that has been lab tested.
Rex


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t.r.
Post Laureate
*****

Reged: 02/14/08

Loc: Upstate NY
Re: Istar refractors Pros and Cons? [Re: tomcody]
      #5779893 - 04/05/13 03:27 PM

Remember the days when Peter Ceravolo had a tent set-up at a star party with an optical bench and he would field evaluate amateur optics? That too would go a long ways to establishing a baseline...it sure helped solidify AP's reputation when an outside source was confirming their optical figuring. Who out there does this now? I know Peter gave it up around 2006, when I asked him to evaluate one of my apos. He said, nowadays, the optical quality for the price amateurs get was excellent in the high end stuff!

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Jeff B
Carpal Tunnel
*****

Reged: 12/30/06

Re: Istar refractors Pros and Cons? [Re: tomcody]
      #5780161 - 04/05/13 05:00 PM Attachment (81 downloads)

And here's another example of a great Istar lens. I was an "early adopter" with a 6" F10 achromat that I built a tube around. An exellent example of a moderately fast achromat. Very sharp.

Jeff


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Jeff B
Carpal Tunnel
*****

Reged: 12/30/06

Re: Istar refractors Pros and Cons? [Re: Jeff B]
      #5780163 - 04/05/13 05:01 PM Attachment (66 downloads)

The business end.

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mgwhittle
Pooh-Bah
*****

Reged: 08/24/11

Loc: Chattanooga, TN
Re: Istar refractors Pros and Cons? [Re: Jeff B]
      #5780240 - 04/05/13 05:46 PM

Jeff, that is a gorgeous build. Did you happen to document it as you built it? I'd be curious about how you got it all together.

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azure1961p
Postmaster
*****

Reged: 01/17/09

Loc: USA
Re: Istar refractors Pros and Cons? [Re: mgwhittle]
      #5780458 - 04/05/13 08:33 PM

Jeff,

Beautiful work. And the inside if my fiberglass newt tube is just so well - so.

Pete


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stevew
Now I've done it


Reged: 03/03/06

Loc: British Columbia Canada
Re: Istar refractors Pros and Cons? [Re: Jeff B]
      #5780562 - 04/05/13 09:15 PM

Quote:

And here's another example of a great Istar lens. I was an "early adopter" with a 6" F10 achromat that I built a tube around. An exellent example of a moderately fast achromat. Very sharp.

Jeff



WOW! Gorgeous, Jeff!

Steve


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CounterWeight
Postmaster
*****

Reged: 10/05/08

Loc: Palo alto, CA.
Re: Istar refractors Pros and Cons? [Re: stevew]
      #5781396 - 04/06/13 10:08 AM

Agree that is a beauty, nice work !

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Jim Curry
Pooh-Bah
*****

Reged: 10/29/07

Loc: STL
Re: Istar refractors Pros and Cons? [Re: Jeff B]
      #5781949 - 04/06/13 02:10 PM



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Rutilus
Carpal Tunnel


Reged: 12/17/10

Re: Istar refractors Pros and Cons? [Re: Jim Curry]
      #5783207 - 04/07/13 07:02 AM Attachment (57 downloads)

This is my Istar 150mmm f/15 BRG (British Racing Green)in grab and go mode. Going to spend the next few months testing this scope out.

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Rutilus
Carpal Tunnel


Reged: 12/17/10

Re: Istar refractors Pros and Cons? [Re: Rutilus]
      #5783208 - 04/07/13 07:03 AM Attachment (41 downloads)

One more.

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Jim Curry
Pooh-Bah
*****

Reged: 10/29/07

Loc: STL
Re: Istar refractors Pros and Cons? [Re: Rutilus]
      #5783515 - 04/07/13 10:44 AM

Now that's a long draw tube :>)

Jim


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B. Cook
professor emeritus
*****

Reged: 10/18/10

Loc: No. California
Re: Istar refractors Pros and Cons? [Re: Jim Curry]
      #5783527 - 04/07/13 10:47 AM

Are you sure that's not a rocket launcher?

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sonny.barile
professor emeritus


Reged: 10/19/10

Loc: In the middle of the glow.
Re: Istar refractors Pros and Cons? [Re: B. Cook]
      #5783537 - 04/07/13 10:54 AM

Where I live that would attract homeland security to raid my yard.

Seriously though.....is that a friction mount? (Like a Dob?) I seem to remember a similar friction mount many years ago in ATM book from Richard berry.

Edited by sonny.barile (04/07/13 10:56 AM)


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Rutilus
Carpal Tunnel


Reged: 12/17/10

Re: Istar refractors Pros and Cons? [Re: sonny.barile]
      #5783670 - 04/07/13 12:10 PM Attachment (34 downloads)

Yes, the mount is based on a Berry mount.
Inside the base, there is a car jack so you raise the whole pier and scope up and down.
When viewing at the Zenith I can raise the scope up so that the eyepiece is 4-5 feet off the ground.
Another photo of the scope pointing to the Zenith.


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Paul C-I
super member


Reged: 03/23/08

Loc: United Kingdom
Re: Istar refractors Pros and Cons? [Re: Rutilus]
      #5783702 - 04/07/13 12:30 PM

Well thought out!
I've been considering the jacking idea for sometime as i'm in the beginning process of designing the build foe an 8" Istar F12 lens. Also been sketching around the friction dob type mountings.
Looking forward to your first light reports
Congrats on your build
Paul


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Daud
sage


Reged: 08/05/06

Loc: AZ, Scottsdale
Re: Istar refractors Pros and Cons? [Re: Paul C-I]
      #5783727 - 04/07/13 12:41 PM

A similar mount for a 10" f10 scope, which would also work for a large Istar lens. Note the OTA is below $4000.
ad

Edited by Daud (04/07/13 12:41 PM)


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Rutilus
Carpal Tunnel


Reged: 12/17/10

Re: Istar refractors Pros and Cons? [Re: Paul C-I]
      #5783792 - 04/07/13 01:16 PM Attachment (25 downloads)

Quote:

Well thought out!
I've been considering the jacking idea for sometime as i'm in the beginning process of designing the build foe an 8" Istar F12 lens. Also been sketching around the friction dob type mountings.
Looking forward to your first light reports
Congrats on your build
Paul




wow!! Paul - that is going to be a serious piece of kit. Are you going for the open frame that Istar offer or traditional tube.
If it is the lighter open tube then I think you will be okay.

In the observatory I use the scope on a driven Fullerscopes
MK 1V mount. This mount handles my f/15 superbly well.


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