|
Mobius1
professor emeritus
Reged: 08/28/05
Posts: 745
Loc: Madison, WI / Gurnee, IL
|
|
Not exactly sure why I'm posting this photo up, but I felt it was somewhat significant. As far as I know, it's the only one out there. A few years back, I got to look through the 40" refractor at Yerkes (even for those who work there, it's not usually accessible), so I snapped a quick pic of Jupiter through the EP. Lots of CA, I know.
--------------------
Martin
William Optics 66SD
Orion 100ED
Orion 120-ST EQ
PST-Ha
Celestron CGE 1100
Canon Rebel XSI with Astronomik filters
DSI-IIC
Homemade spectroscope in progress...
Yerkes Observatory Volunteer
(24" Cass on weekends)
|
Freddy WILLEMS
Carpal Tunnel
Reged: 11/13/05
Posts: 2931
Loc: Hawaii, Honolulu
|
|
I expected a lot better !
But then again it's only one frame, no Avi taken I believe.
--------------------
Freddy
Meade 14" LX200 GPS UHTC GPS on permanent pier
Celestron C 14" Peltier cooled for planetary imaging.
Meade 10" LX200 & TITAN 50:1 mount Gemini 'go to'
Meade 127 mm f/9 APO & TITAN 50:1 mount Gemini 'go to'
W/O 102 mm f/7 APO doublet
Orion 80 mm f/7 ED
DFK 21AU04.AS
ToUcam 840 II pro
Canon 10D Unmoddified
Canon 40D Hutech moddified
|
Mobius1
professor emeritus
Reged: 08/28/05
Posts: 745
Loc: Madison, WI / Gurnee, IL
|
|
Lol, no, not at all. Actually I was helping with the tour group, so I just kind of popped my Canon A80 in the EP in between viewers.
That is, however, more or less what it looked like through that scope. The seeing was terrible, but you can imagine how long a 100 foot tube with a huge lens takes to cool down.
--------------------
Martin
William Optics 66SD
Orion 100ED
Orion 120-ST EQ
PST-Ha
Celestron CGE 1100
Canon Rebel XSI with Astronomik filters
DSI-IIC
Homemade spectroscope in progress...
Yerkes Observatory Volunteer
(24" Cass on weekends)
Edited by Mobius1 (10/16/09 06:48 AM)
|
RedIrocZ-28
Pooh-Bah
Reged: 09/18/05
Posts: 1369
Loc: Grand Rapids, Michigan
|
|
You're right, that is terrible 
But, it is through a 40" scope.  Not many people can say they got to look through one, let alone grab an image.
--------------------
|
Savio Fong
Vendor (Galaxy Scientific)
Reged: 10/05/09
Posts: 38
Loc: Hong Kong
|
|
Martin, how is the view throught the telescope? Of course I assume we can't expect much because of Jupiter's so low on the sky.
I was there watching M5, Jul 03 last year.
Savio
--------------------
My Blog - Star Fantasy
Fixed domes : Lake Egret Observatory, Star Academy
Mobile Equipment : APM 203 f7 APO refractor, Paramount ME, PWT Tripod
Eyepieces : only TMB Supermonocentrics and Televue Ethos
|
starbux
sage
Reged: 02/08/06
Posts: 298
Loc: Silicon Valley, CA
|
|
Quote:
... so I snapped a quick pic of Jupiter through the EP. Lots of CA, I know.
The CA is not *that* bad for an antique refractor (not counting the fuzzyness of the view overall). A couple of years ago I saw Jupiter through a 20" Brasheer(sp?) refractor at the Chabot Space & Science Center (see pic)
The chromatic aberration on Jupiter was MUCH worse than in your image from Yerkes. And half the aperture too.
|
BrianFitz
Carpal Tunnel
Reged: 07/17/08
Posts: 1803
Loc: Northern California
|
|
Deffinately the best part of that tour was looking through a 40
--------------------
Fitz
Meade LX200R 10" F/10
Meade 152ED APO
Stellarvue Raptor 80ED
Celestron CGE
Various EP's / Televue diagonals
QHY8 / QHY5 / Philips SPC 900 / Canon Xsi
20X80 Celestron / 7X50 Meade Binos
“Lots of "Dreams”
“The Skillful Illusionist Makes the Best Image" ~ Tony Hallas
|
Mobius1
professor emeritus
Reged: 08/28/05
Posts: 745
Loc: Madison, WI / Gurnee, IL
|
|
Indeed... I can imagine that it would be so much better on globular clusters (as that is Dr. Cudworth's field of research anyways), we just had to view something bright. Lots of atmospheric blurring (humid august night) and CA. But hey, it's still a 40". Though when properly cooled (which doesn't take long), the 24" gave a much crisper view.
--------------------
Martin
William Optics 66SD
Orion 100ED
Orion 120-ST EQ
PST-Ha
Celestron CGE 1100
Canon Rebel XSI with Astronomik filters
DSI-IIC
Homemade spectroscope in progress...
Yerkes Observatory Volunteer
(24" Cass on weekends)
|
Deep13
Carpal Tunnel
Reged: 01/25/05
Posts: 2038
Loc: NE Ohio
|
|
I read a story by Timothy Ferris about his experience with the 24" Clark refractor at Lowell observatory. He was observing Saturn and experienced a lot of aberrations. He then removered the modern EP and adapter and installed one of the original EPs that Clark made for that scope. Most of the aberrations vanished leaving a sharp planetary image.
--------------------
That which can be asserted without evidence can be dismissed without evidence.
|
Orion_PKFD
sage
Reged: 01/22/08
Posts: 433
Loc: Vieira do Minho, Portugal
|
|
It's not CA, it's mainly atmospheric refraction
--------------------
André Gonçalves
http://astro-andregoncalves.blogspot.com/
SkyView Pro 8" EQ
Dob 4,5" (ATM)
60mm achromatic refractor
10x50 WA
10x25
SPC900NC
DSI
Canon 1000D
|
|
7 registered and 12 anonymous users are browsing this forum.
Moderator: Charlie Hein, knuklhdastnmr
Print Thread
|
Forum Permissions
You cannot start new topics
You cannot reply to topics
HTML is disabled
UBBCode is enabled
|
Thread views: 508
|
|
|
|
|
|
|
Previous
Index
Next
Threaded
Edit
Reply
Quote
