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Equipment Discussions >> Refractors

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FirstSightModerator
Duke of Deneb
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Reged: 12/26/05

Loc: Raleigh, NC
Re: Istar achromats best way to go for big scope ? new [Re: RGM]
      #6072128 - 09/09/13 09:07 PM

This thread is now RE-OPEN for posting comments. Constructive, respectful critiquing of Istar achromats is welcome, provocatively disrespectful comments toward same or other members, not so much.

Edited by FirstSight (09/09/13 10:21 PM)


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dlapoint
scholastic sledgehammer


Reged: 08/18/03

Loc: Moncton NB Canada
Re: Istar achromats best way to go for big scope ? new [Re: RGM]
      #6073762 - 09/10/13 07:16 PM

Bob, doubles and planetary viewing is what I want the scope for. Where did you buy yours?

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A. Viegas
Pooh-Bah
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Reged: 03/05/12

Loc: New York City/ CT
Re: Istar achromats best way to go for big scope ? new [Re: RGM]
      #6073816 - 09/10/13 07:48 PM

Just a generic question, but why not an 8" F16 for super planetary type work? is the mounting issues of such a long tube the main problem? FL would be like 3200, so not too much in terms of magnification... Just wondering why nobody builds longer FL than F12 generally?

Al


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David PavlichAdministrator
Transmographied
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Reged: 05/18/05

Loc: Mandeville, LA USA
Re: Istar achromats best way to go for big scope ? new [Re: A. Viegas]
      #6073915 - 09/10/13 08:46 PM

Quote:

Just a generic question, but why not an 8" F16 for super planetary type work? is the mounting issues of such a long tube the main problem? FL would be like 3200, so not too much in terms of magnification... Just wondering why nobody builds longer FL than F12 generally?

Al




Think about the mount you'd need for that 8" lever. And think about where you'd house it. All big stuff.

David


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beanerds
sage


Reged: 07/15/08

Loc: Darwin Australia
Re: Istar achromats best way to go for big scope ? new [Re: David Pavlich]
      #6073985 - 09/10/13 09:36 PM Attachment (46 downloads)

Good choice the Isatr's are and Matt I look forward to what ever you decide on .
If I had a mount like your beautiful 'Gaunt' I would definatly look at the 7.1 inch f8 or f12 slim , R35 by Istar and if these are as good as I hear you will be right by one of these .
One of these would keep the weight down as well .

By the way here is a shot of Venus taken last Saturday night in my Istar 127mm f8 achro , this is raw , no work except a small zoom and crop with sizing for CN's .
Great objectives .

Brian.

Edited by beanerds (09/10/13 09:39 PM)


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Kunama
professor emeritus


Reged: 10/22/12

Re: Istar achromats best way to go for big scope ? new [Re: beanerds]
      #6074000 - 09/10/13 09:50 PM

I think the 8" F9 is about the biggest I would want to put on the mount, although no doubt it will carry much more weight, I still need to be able to move the thing around. At the moment I can carry the mount but the pier needs a trolley. I am guessing the all up weight will be about 150Kg or 330 lbs. When complete I hope to take the lot to starparties on a custom cradle in a trailer.

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RGM
scholastic sledgehammer
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Reged: 09/15/03

Loc: Burks Falls, Ontario, Canada
Re: Istar achromats best way to go for big scope ? new [Re: dlapoint]
      #6074543 - 09/11/13 08:11 AM

Quote:

Bob, doubles and planetary viewing is what I want the scope for. Where did you buy yours?




Derek, I purchased mine from Canadian Telescopes. At the time they were having a sale. If you contact Mike at Istar, you might find they have a few overstocked scopes at a sale price. I believe they will cover a portion of the shipping from Florida.


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dan_h
Carpal Tunnel


Reged: 12/10/07

Re: Istar achromats best way to go for big scope ? new [Re: RGM]
      #6074615 - 09/11/13 09:08 AM

Quote:

Quote:

Bob, doubles and planetary viewing is what I want the scope for. Where did you buy yours?




Derek, I purchased mine from Canadian Telescopes. At the time they were having a sale. If you contact Mike at Istar, you might find they have a few overstocked scopes at a sale price. I believe they will cover a portion of the shipping from Florida.




Istar currently has an ad on AM for a sale of overstock items. There are a couple of nice sized scopes available at a decent discount.

dan


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dlapoint
scholastic sledgehammer


Reged: 08/18/03

Loc: Moncton NB Canada
Re: Istar achromats best way to go for big scope ? new [Re: dan_h]
      #6075020 - 09/11/13 12:44 PM

thanks guys, I will look into it

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rwiederrich
Goldfinger
*****

Reged: 11/17/05

Loc: Always Dark skies of Belfair W...
Re: Istar achromats best way to go for big scope ? new [Re: A. Viegas]
      #6075508 - 09/11/13 04:43 PM

Quote:

Just a generic question, but why not an 8" F16 for super planetary type work? is the mounting issues of such a long tube the main problem? FL would be like 3200, so not too much in terms of magnification... Just wondering why nobody builds longer FL than F12 generally?

Al




I wouldn't say that...I had a hand in builing a 6"f/15 and I build my 10"f/15.

Rob


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Jon Isaacs
Postmaster
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Reged: 06/16/04

Loc: San Diego and Boulevard, CA
Re: Istar achromats best way to go for big scope ? new [Re: rwiederrich]
      #6075530 - 09/11/13 04:57 PM

Quote:

I wouldn't say that...I had a hand in builing a 6"f/15 and I build my 10"f/15.

Rob




Rob:

Who made the lens for your 10 inch F/15? You didn't make that yourself did you?

Jon


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Jon Isaacs
Postmaster
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Reged: 06/16/04

Loc: San Diego and Boulevard, CA
Re: Istar achromats best way to go for big scope ? new [Re: beanerds]
      #6075534 - 09/11/13 05:00 PM

Interesting photo.

I am not seeing the blue-red/orange atmospheric refraction at the bottom and top of Venus that I see with my reflectors (and apo's).

Jon


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Messyone
professor emeritus


Reged: 05/02/12

Loc: Down Under
Re: Istar achromats best way to go for big scope ? new [Re: Jon Isaacs]
      #6076348 - 09/12/13 04:39 AM

Quote:

Interesting photo.

I am not seeing the blue-red/orange atmospheric refraction at the bottom and top of Venus that I see with my reflectors (and apo's).
Jon



Jon thats because the Istar objectives are that good...really. I have a great Synta 6" f8 but am in the process of building a 6" f12 Istar scope. f12 is a long as I could go with my mount and tripod.
Rob I think I should join your refractor group.
Matt


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mikey cee
Postmaster
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Reged: 01/18/07

Loc: bellevue ne.
Re: Istar achromats best way to go for big scope ? new [Re: Messyone]
      #6076714 - 09/12/13 10:37 AM

Matt Istars are more than good...they are great. But you will still see atmosheric dispersion or aberration. I do. Just wanted to set the record straight. Mike

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Kunama
professor emeritus


Reged: 10/22/12

Re: Istar achromats best way to go for big scope ? new [Re: mikey cee]
      #6077457 - 09/12/13 05:24 PM

Thank you all for the feedback, I have decided to go with the Istar objectives and once underway will do a thread in the ATM forum.

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beanerds
sage


Reged: 07/15/08

Loc: Darwin Australia
Re: Istar achromats best way to go for big scope ? [Re: Jon Isaacs]
      #6078242 - 09/13/13 05:46 AM Attachment (22 downloads)

what are you suggesting Jon ? , here is the original , sized for CN's of course .
Brian.
Quote:

Interesting photo.

I am not seeing the blue-red/orange atmospheric refraction at the bottom and top of Venus that I see with my reflectors (and apo's).

Jon




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