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Equipment Discussions >> Classic Telescopes

Pages: 1
Bonco
Post Laureate
*****

Reged: 04/17/06

Loc: Florida
60mm f/20... 80mm f15 comparo new
      #5127320 - 03/17/12 04:54 PM

Been wanting to do a comparo for a long time. Last night clouds moved in so I only had 2 targets for the comparo. Stopped down my Carton 80mm f/15 to become a 60mm f/20.

Rigel absolutely beautiful APO type view at 60mm, f/20, However I found the view more pleasing unmasked at 80mm mainly because the secondary was noticably brighter.

Alnitak surprised me, the 60mm with a 9mm eyepiece showed a crisp split when skies steadied. I've never had this good of a view with any 60mm scope. Using the same eyepiece at 80mm the view wasn't as good or sharp... So I cheated and used my 4.8mm Nagler and now the 80mm won. I learned that 60mm f/20's have amazing abilities. I'm sure owners would agree. Cheers, Bill


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Larry Geary
Carpal Tunnel
*****

Reged: 09/24/06

Re: 60mm f/20... 80mm f15 comparo new [Re: Bonco]
      #5127539 - 03/17/12 07:15 PM

So which scope are you going to keep?

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Bonco
Post Laureate
*****

Reged: 04/17/06

Loc: Florida
Re: 60mm f/20... 80mm f15 comparo new [Re: Larry Geary]
      #5127569 - 03/17/12 07:39 PM

It's only one scope...So I guess I'll keep it. Takes me about 10 seconds to install or remove the 60mm mask.
Bill


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dbledsoe
Pooh-Bah
*****

Reged: 06/09/06

Loc: Boise, Idaho USA
Re: 60mm f/20... 80mm f15 comparo new [Re: Bonco]
      #5127579 - 03/17/12 07:55 PM

Bill,

Thanks for posting your comparison. That was an excellent idea and I think I'll do the same type of comparison using my new to me Tasco 10K (80mm f/15) if I ever get a clear night.

Don


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strdst
Post Laureate
*****

Reged: 03/23/08

Loc: Oregon Territory
Re: 60mm f/20... 80mm f15 comparo new [Re: Bonco]
      #5127731 - 03/17/12 10:14 PM Attachment (413 downloads)

Hi Bill,

Stopped down to 60mm this 80mm f/20 would become uh, f/26.6. Would
there be an advantage to that or is f/20 ideally refractor sloooow?

other keith


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Bonco
Post Laureate
*****

Reged: 04/17/06

Loc: Florida
Re: 60mm f/20... 80mm f15 comparo new [Re: strdst]
      #5129018 - 03/18/12 05:23 PM

Could be fun to do a comparo, but an 80mm at f/20 should be an excellent optic, free of CA. I doubt stopping it down would improve things except maybe better high power views in unsteady skies. Great looking if not unusual setup. How is the collimation?
Bill


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Ain Soph Aur
professor emeritus
*****

Reged: 08/11/11

Loc: West Tennessee
Re: 60mm f/20... 80mm f15 comparo new [Re: Bonco]
      #5162716 - 04/08/12 08:41 PM

I have a 60mm aperture reduction mask for my Carton 100mm f/13, which would make it f/21.7. I've only had the Carton for a litle over a week, and moving over last weekend haven't had an opportunity to try it out at f21.7 yet. I imagine it should perform wonderfully as the center 60mm of the already outstanding 100mm Carton objective should provide awesome views.

That 80mm f/20 above is insane


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Doug76
Long Achro Junkie
*****

Reged: 12/05/07

Loc: Refractor Heaven
Re: 60mm f/20... 80mm f15 comparo new [Re: Ain Soph Aur]
      #5163906 - 04/09/12 05:21 PM

My Carton 60mm f/20 is awesome, and as the OP says, apo-like views. This one gets buried with me!

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strdst
Post Laureate
*****

Reged: 03/23/08

Loc: Oregon Territory
Re: 60mm f/20... 80mm f15 comparo [Re: Bonco]
      #5166136 - 04/10/12 11:30 PM

Hi Bill,

I forgot to get back to your thread...sorry... the collimation is perfect. As fine as I've seen, a remarkable 80mm scope.

other keith


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