Telescope Reviews: Cool telescope at WSP

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kfrederick
Carpal Tunnel

Reged: 02/01/08

Cool telescope at WSP new

#5673602 - 02/11/13 08:12 AM

Had my best views ever in a fast 32inch at WSP I was very impressed .

Post Extras:

polaraligned
professor emeritus

Reged: 12/26/08

Re: Cool telescope at WSP new

[Re: kfrederick]
#5673609 - 02/11/13 08:21 AM

That is good...more details?? How fast? Kennedy mirror? Wood or aluminum structure?

Post Extras:

Mirzam
Post Laureate

Reged: 04/01/08

Loc: Lovettsville, VA

Re: Cool telescope at WSP new

[Re: polaraligned]
#5673621 - 02/11/13 08:31 AM

And how did your chief perform?

JimC

Post Extras:

kfrederick
Carpal Tunnel

Reged: 02/01/08

Re: Cool telescope at WSP new

[Re: Mirzam]
#5673666 - 02/11/13 09:21 AM

I liked the views in my CHief Had some astig but nice contrast I thought .the mount needs work .They had very heavy dew but only my eyepiece dew up .I used no heat. Some big boys got to look .Howie G has some ideas for my side supports for my primary . But the views in that 32 was unreal good . Very impressed .Did not think a telescope that fast could work that good . The sky was very steady The Orion Neb had detail so vivid I have not seen in pic it was worth the trip .Glad Mike ask me to look .

Edited by kfrederick (02/11/13 11:06 AM)

Post Extras:

Pinbout
Post Laureate

Reged: 02/22/10

Loc: Montclair

Re: Cool telescope at WSP new

[Re: kfrederick]
#5673721 - 02/11/13 09:58 AM

who made the scope and who made the mirror?

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Dave O
super member

Reged: 12/21/11

Loc: Sri Lanka

Re: Cool telescope at WSP new

[Re: Pinbout]
#5673744 - 02/11/13 10:09 AM

Could you see color in the Orion Nebula? I've heard many can see 'green', and in the larger scopes even blues and a bit of red ... just curious ...

Post Extras:

kfrederick
Carpal Tunnel

Reged: 02/01/08

Re: Cool telescope at WSP new

[Re: Dave O]
#5673823 - 02/11/13 10:56 AM

Blood red and patterns in the dust clouds unlike I have seen even in pic very steady air. I think the mirror was a f3.7 Lockwood

Post Extras:

bremms
scholastic sledgehammer

Reged: 08/31/12

Loc: SC

Re: Cool telescope at WSP new

[Re: kfrederick]
#5674082 - 02/11/13 01:36 PM

Good collimation and a coma corrector?

Post Extras:

Mike Lockwood
Vendor, Lockwood Custom Optics

Reged: 10/01/07

Loc: Usually in my optical shop

Re: Cool telescope at WSP new

[Re: kfrederick]
#5674138 - 02/11/13 02:12 PM

Quote:

Blood red and patterns in the dust clouds unlike I have seen even in pic very steady air. I think the mirror was a f3.7 Lockwood

Close, it is f/3.6. Good to meet you, Kevin. Keep working on the mechanical aspects of your scope.

Quote:

Good collimation and a coma corrector?

Yes, and a SIPS (which is a Paracorr II).

Jupiter at ~700x was my favorite view of the event. Many other objects were too detailed to describe. Sirius' companion, the Pup, was trivial to see. Color in M42 and M43 was easy to see in the 32" and smaller scopes, and there were 10 stars in the Trapezium.

We had more clear skies this year than last, but the seeing was a little better last year when we were viewing Mars at ~900x with the same scope, and the Eskimo Nebula at 2000x+.

Post Extras:

Darren Drake
Carpal Tunnel

Reged: 10/09/02

Loc: Chicagoland

Re: Cool telescope at WSP new

[Re: Mike Lockwood]
#5674541 - 02/11/13 05:57 PM

Mike,
Will we see some more details about your trip on your website?

Post Extras:

kfrederick
Carpal Tunnel

Reged: 02/01/08

Re: Cool telescope at WSP new

[Re: Darren Drake]
#5675400 - 02/12/13 08:36 AM

Seeing the trapezium looked like a open cluster . Titan disk was big . Great planet views . Size does matter and great sky . I could see no coma and the edge was great .

Post Extras:

mark cowan
Vendor (Veritas Optics)

Reged: 06/03/05

Loc: salem, OR

Re: Cool telescope at WSP new

[Re: kfrederick]
#5676123 - 02/12/13 03:47 PM

Kevin, are you thinking of joining the ranks of the unwashed?

Best,
Mark

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kfrederick
Carpal Tunnel

Reged: 02/01/08

Re: Cool telescope at WSP new

[Re: mark cowan]
#5676213 - 02/12/13 04:32 PM

I was impressed and glad to use it . With Al very cool . Worth the trip . Much more than a 25 .

Post Extras:

mark cowan
Vendor (Veritas Optics)

Reged: 06/03/05

Loc: salem, OR

Re: Cool telescope at WSP new

[Re: kfrederick]
#5676410 - 02/12/13 06:40 PM

That is kind of the general rule for resolution. Bigger aperture with a CO under excellent skies beats smaller unobstructed.

How well did your Chief acquit itself, then? What were comments like?

Best,
Mark

Post Extras:

kfrederick
Carpal Tunnel

Reged: 02/01/08

Re: Cool telescope at WSP [Re: mark cowan]
#5677084 - 02/13/13 06:42 AM

The Chief did good I thought The back ground sky was black and was noted by one person . Also The high contrast was noted by some . I was showing astig in the defocused images but in focus it worked good . Al said to finish it and take it to Stelafane .I just wonted to have the pros look . And that happened . I am glad I came . And glad I got a look in that 32 inch .

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Mike I. Jones
Carpal Tunnel

Reged: 07/02/06

Loc: Fort Worth TX

Re: Cool telescope at WSP new

[Re: kfrederick]
#5677278 - 02/13/13 09:21 AM

Your Chief is by definition an off-axis system, so even with all perfect optics (which yours come very close to), there will be astigmatism as you roll through focus. There is even astigmatism at best focus, but it's so slight it gets lost in the diffraction patterns. There is a very shallow focusing range either side of best focus before you visually see the astigmatism. I'll post up through-focus spots of your Chief later today.

That being said, is there any chance your support system is very very slightly warping Carl's mirror? Even though it's a strong hyperboloid, you could still star test it and look for through-focus astigmatism without the correctors in the path. Just a thought.

Mike

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kfrederick
Carpal Tunnel

Reged: 02/01/08

Re: Cool telescope at WSP new

[Re: Mike I. Jones]
#5677532 - 02/13/13 11:47 AM

Thanks Mike My edge supports for the primary was hanging up Howie Glatter is making me a new support . I set it up in the day but didnot work on it at night. The image was the best on my last night. I am planing a new box so I can have the lens out of the way when the laser is used as it is altered some .Or use your idea of the laser mounted at the center of the incomeing light . My setup was off some .But I liked the views and very proud of the work You and Dave did for me .On Eds Chief.design.

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careysub
Pooh-Bah

Reged: 02/18/11

Loc: Rancho Cucamonga, CA

Re: Cool telescope at WSP new

[Re: Dave O]
#5684050 - 02/16/13 06:48 PM

Quote:

Could you see color in the Orion Nebula? I've heard many can see 'green', and in the larger scopes even blues and a bit of red ... just curious ...

On another thread (and forum) someone was just saying that the surface brightness of an extended object is always the same at equal exit pupil (limited of course by your eye's entrance pupil). That would mean that in viewing a nebula in a large scope you are seeing it at higher magnification, but the same surface brightness.

Whence does the ability to start seeing colors in the nebula come then?

Post Extras:

Mike I. Jones
Carpal Tunnel

Reged: 07/02/06

Loc: Fort Worth TX

Re: Cool telescope at WSP new

[Re: careysub]
#5684147 - 02/16/13 07:53 PM

Google "Purkinje effect" (it's pronounced Pur-Kine). It's all there, explained better than I can.
Mike

Post Extras:

careysub
Pooh-Bah

Reged: 02/18/11

Loc: Rancho Cucamonga, CA

Re: Cool telescope at WSP new

[Re: Mike I. Jones]
#5685312 - 02/17/13 02:11 PM

Quote:

Google "Purkinje effect" (it's pronounced Pur-Kine). It's all there, explained better than I can.
Mike

Doesn't seem to address the issue. It discusses the process of extinction of color vision as light levels drop to "night-time" levels.

The question is the apparent contradiction between the claim that extended objects have the same surface brightness regardless of aperture (with the same exit pupil); and the claim that large aperture telescopes allow seeing color in extended objects that are absent in smaller scopes.

One possibility is that there are brighter regions within the Orion Nebula that become magnified in a large scope to the point that they become visible and can thus generate color perception.

Post Extras:

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