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Equipment Discussions >> Refractors

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TG
Pooh-Bah


Reged: 11/02/06

Loc: Latitude 47
Re: AP 178 f/9 Questions new [Re: Joe Bergeron]
      #5820111 - 04/24/13 03:58 PM Attachment (34 downloads)

Quote:

Quote:


On another note, do I need to shine a green laser through the objective to determine air or oil-spaced? If so, can someone tell me what to look for t tell the difference?




You can just look at the lens. If you see multiple reflections of some light source, it's air spaced. If you see only 2 reflections, it's oiled.






The green laser "test" can be surprisingly hard to interpret. I've attached a picture of one done on the oil-spaced version.

Tanveer.


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Mike Clemens
Frozen to Eyepiece
*****

Reged: 11/26/05

Loc: Alaska, USA
Re: AP 178 f/9 Questions new [Re: TG]
      #5820769 - 04/24/13 08:35 PM

is that the 178? looks awesome ! more pics plz : ) From that era, I believe if it was air spaced it would have clear air spacing tabs every 120 degrees around the periphery.

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gillmj24
Post Laureate
*****

Reged: 12/06/05

Loc: PA
Re: AP 178 f/9 Questions new [Re: Mike Clemens]
      #5820935 - 04/24/13 10:02 PM

I thought the green laser test was only for fluorite?

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The Ardent
Pooh-Bah
*****

Reged: 10/24/08

Loc: Virginia
Re: AP 178 f/9 Questions new [Re: stevenwav]
      #5820953 - 04/24/13 10:11 PM

You were standing two feet away from a 900 QMD this weekend and you didnt buy it?

Quote:

I will look into obtaining a 900.




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stevenwav
sage
*****

Reged: 02/06/12

Loc: New England
Re: AP 178 f/9 Questions new [Re: The Ardent]
      #5821045 - 04/24/13 11:12 PM

No I didn't buy the 900 last weekend. I didn't think I would be going in that direction at the time. I know more now thanks to everyone's input.

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stevenwav
sage
*****

Reged: 02/06/12

Loc: New England
Re: AP 178 f/9 Questions new [Re: TG]
      #5821048 - 04/24/13 11:14 PM

I will try this on both scopes, thanks for demo.

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richardlowney
member
*****

Reged: 12/04/09

Loc: Wisconsin
Re: AP 178 f/9 Questions new [Re: stevenwav]
      #5821467 - 04/25/13 08:40 AM

PM sent

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etsleds
sage
*****

Reged: 11/14/09

Re: AP 178 f/9 Questions new [Re: richardlowney]
      #5822202 - 04/25/13 01:40 PM

Agreed on the AP900 - it handles the AP178 for visual with short settle times, solid stability at the eyepiece, sufficient overcapacity to handle heavy accessories & some wind handily.

Will do in a pinch on an EM200, but very fussy and unstable. Have tried both heads on the same ATS pier, it's the head and not the pier/tripod.


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etsleds
sage
*****

Reged: 11/14/09

Re: AP 178 f/9 Questions new [Re: etsleds]
      #5827784 - 04/28/13 06:19 AM Attachment (38 downloads)

Found some pictures...here's how spindly an EM200 with the massive SE-LL tripod looks under an AP178...

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etsleds
sage
*****

Reged: 11/14/09

Re: AP 178 f/9 Questions new [Re: etsleds]
      #5827788 - 04/28/13 06:24 AM Attachment (36 downloads)

And looking more proper on an AP900...

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mvw
super member


Reged: 03/07/13

Loc: Somewhere in the universe
Re: AP 178 f/9 Questions new [Re: etsleds]
      #5827796 - 04/28/13 06:38 AM

Beautiful system.

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johnnyha
Postmaster
*****

Reged: 11/12/06

Loc: Sherman Oaks, CA
Re: AP 178 f/9 Questions new [Re: etsleds]
      #5827882 - 04/28/13 08:36 AM

Lookin good Andrew!

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stevenwav
sage
*****

Reged: 02/06/12

Loc: New England
Re: AP 178 f/9 Questions new [Re: etsleds]
      #5829364 - 04/28/13 11:48 PM

Yowza - that says it all right there! The 900qmd is almost on its way!

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stevenwav
sage
*****

Reged: 02/06/12

Loc: New England
Re: AP 178 f/9 Questions new [Re: Jeff B]
      #5839221 - 05/03/13 10:30 PM

By way of update- i have finally had a chance to look at the lens closely... Transparent spacers - therefore air-spaced!!
Obviously i am very psyched and cant wait for he 900qmd to arrive. Pics and first light when it does.


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