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#651 JakeJ

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Posted 18 February 2018 - 07:17 PM

 

They are also optomized for the shorter light path of smaller diagonals. The further you move the eyepiece back the longer the e.f.l. with an SCT and the more the optical deficiencies show up.

 

 

Absolutely.  I have a Baader T2 on mine as it is the shortest path - made a noticable difference.

Using a 2" diagonal actually increases wavefront error.


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#652 CHASLX200

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Posted 18 February 2018 - 07:21 PM

 

 

They are also optomized for the shorter light path of smaller diagonals. The further you move the eyepiece back the longer the e.f.l. with an SCT and the more the optical deficiencies show up.

 

 

Absolutely.  I have a Baader T2 on mine as it is the shortest path - made a noticable difference.

Using a 2" diagonal actually increases wavefront error.

 

I threw on a 2" Diagonal once for kicks and it just threw the whole scope out of balance. But i like to use the big and heavy Nags or may want to use a Ethos here and there. These heavy eypieces are hard on the fork mounted C5 as it is tail heavy even with 1.25" stuff. I just bought some tube weights and clip to help with balance.


Edited by CHASLX200, 18 February 2018 - 07:43 PM.

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#653 tim53

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Posted 18 February 2018 - 07:21 PM

 

 

 

 

 

WAY up north, a Parks 12.5 fast newt:

 

https://anchorage.cr...6500413897.html

What the devil is that? F/3.5. Coma heaven. Looks like the polar axis is set for the ABC islands just north of South america.

 

I noticed the same thing, That mount would be of little use in Alaska as it is set up but if the price were not so absurd I would love to have it.  I wonder who made those optics.

 

I am sure Parks made them. It could be a vert, where you have  a F/15 focus and a much faster Newt focus. I am guessing that is a F/4. I don't see a Cass focuser in the back so i guess it is a Newt only.

 

I decided to check Parks' web site. It is a 12.5 f/4 "Superior Nightlight System" which the say has a $12,485 MSRP, but just for you they discount it to $6,999.

 

http://www.parksopti...itelight System

 

No way i would pay over $2500 new or used.

 

Considering an 11 or 12" SCT is considerably more than that new, it's not an unreasonable price.  But moot, as Parks is not in business.



#654 CHASLX200

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Posted 18 February 2018 - 07:40 PM

 

 

 

 

 

 

WAY up north, a Parks 12.5 fast newt:

 

https://anchorage.cr...6500413897.html

What the devil is that? F/3.5. Coma heaven. Looks like the polar axis is set for the ABC islands just north of South america.

 

I noticed the same thing, That mount would be of little use in Alaska as it is set up but if the price were not so absurd I would love to have it.  I wonder who made those optics.

 

I am sure Parks made them. It could be a vert, where you have  a F/15 focus and a much faster Newt focus. I am guessing that is a F/4. I don't see a Cass focuser in the back so i guess it is a Newt only.

 

I decided to check Parks' web site. It is a 12.5 f/4 "Superior Nightlight System" which the say has a $12,485 MSRP, but just for you they discount it to $6,999.

 

http://www.parksopti...itelight System

 

No way i would pay over $2500 new or used.

 

Considering an 11 or 12" SCT is considerably more than that new, it's not an unreasonable price.  But moot, as Parks is not in business.

 

I don't even think i could lift that short F/4 tube or even wanna try such a fast optic as i only view planets.  But for around $2500 it is not a bad deal.

Add a Paracorr 2 and it could be pretty good.



#655 WoodyEnd

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Posted 18 February 2018 - 10:33 PM

 

 

 

 

 

 

WAY up north, a Parks 12.5 fast newt:

 

https://anchorage.cr...6500413897.html

What the devil is that? F/3.5. Coma heaven. Looks like the polar axis is set for the ABC islands just north of South america.

 

I noticed the same thing, That mount would be of little use in Alaska as it is set up but if the price were not so absurd I would love to have it.  I wonder who made those optics.

 

I am sure Parks made them. It could be a vert, where you have  a F/15 focus and a much faster Newt focus. I am guessing that is a F/4. I don't see a Cass focuser in the back so i guess it is a Newt only.

 

I decided to check Parks' web site. It is a 12.5 f/4 "Superior Nightlight System" which the say has a $12,485 MSRP, but just for you they discount it to $6,999.

 

http://www.parksopti...itelight System

 

No way i would pay over $2500 new or used.

 

Considering an 11 or 12" SCT is considerably more than that new, it's not an unreasonable price.  But moot, as Parks is not in business.

 

I would price a used Parks similar to a Cave as the two are almost the same.  



#656 deSitter

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Posted Yesterday, 12:15 AM

 

WAY up north, a Parks 12.5 fast newt:

 

https://anchorage.cr...6500413897.html

What the devil is that? F/3.5. Coma heaven. Looks like the polar axis is set for the ABC islands just north of South america.

 

Looks like f/4 to me.

 

-drl



#657 Chuck Hards

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Posted Yesterday, 02:36 PM

Nippon Kogaku 65mm refractor in the Classifieds:  LINK

 

Inexpensive ex-military flat for DPAC up to 3" scopes:  LINK


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#658 Kasmos

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Posted Yesterday, 03:26 PM

And a Nippon Kogaku 50mm OTA from the same seller.

 

https://www.cloudyni...on-kogaku-50mm/

 

 

 


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#659 JakeJ

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Posted Yesterday, 08:06 PM

*FREE*

 

Vintage pier (Optical craftsmen?  Pacific Instr?)  for free:

 

https://sfbay.craigs...6502769758.html



#660 CHASLX200

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Posted Yesterday, 08:11 PM

*FREE*

 

Vintage pier (Optical craftsmen?  Pacific Instr?)  for free:

 

https://sfbay.craigs...6502769758.html

I could just plop my C5 on that.  But it is in Cali.




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