rustynpp
Pooh-Bah
Reged: 08/27/04
Posts: 1018
|
|
Just curious here, would it be possible to use one side of a binoviewer as a spot for a webcam (for planetary photo) while the other side is used for an eyepiece to get the image onto the screen? Seems like it would take most of the headach out of trying to center the image perfectly to get it on that tiny chip.
On a different note, is a 2x barlow placed between the diagonal and the binoviewer still a 2x barlow? or is it 3x?
Thanks
|
jrcrilly
Refractor wienie no more
Reged: 04/30/03
Posts: 30716
Loc: NE Ohio
|
|
Quote:
Just curious here, would it be possible to use one side of a binoviewer as a spot for a webcam (for planetary photo) while the other side is used for an eyepiece to get the image onto the screen? Seems like it would take most of the headach out of trying to center the image perfectly to get it on that tiny chip.
On a different note, is a 2x barlow placed between the diagonal and the binoviewer still a 2x barlow? or is it 3x?
Thanks
I've done the binoviewer-as-flip-mirror trick and it does work.
A 2X Barlow between the diagonal and the binoviewer will be at least 3X, maybe closer to 4X depending on the Barlow and on the length of the light path within the bino.
--------------------
John C
Battle Cry of Reno
http://www.wadsworthobservatory.com
My Cloudy Nights gallery
AT12RC
AT65EDQ
QSI683WSG-8
Roper Scientific Quantix 6303E "project" camera
mystery EQ mount on the way
|
Anonymous
Unregistered
|
|
What a great idea!
|
Anonymous
Unregistered
|
|
This issue was addressed a few months back.
I used Tom Hole's yardstick method,
http://www.astromart.com/forums/viewpost.asp?forum_post_id=225280&poll_id=&news_id=&page=
and ran a yardstick calculation twice using the Denkmeier 3 position Power Switch and 19mm Panoptics. I averaged the two measurements and they came close to the-----left—1.4x, middle—2.5x, right—2x---- that Denkmeier claims the optics of the Power Switch provide.
They were 1.48x, 2.4x, 1.98x.
From these numbers I assumed that this method to measure magnification was reasonably accurate.
I ran the test again using a TV Big Barlow (2x) in front of the OCS. I averaged, 4.3x, 7.3x, 5.78x in the 3 positions.
Hope this helps with your question.
14.5" f/4.3 Dob
Bill Walters
|
Oldfield
Postmaster
Reged: 03/20/02
Posts: 6310
Loc: Hong Kong
|
|
I wonder if good image can be obtained with such a configuration... you got half of the light and you need to push the gain really high such that noise will become a great issue.
A good trial anyway, as it won't hurt, let us know the result. 
--------------------
The Home Astronomer from a city where most people are proud of the light pollution
Toys: Tele Vue Ranger, GOTO Mark-X, Lumenera LU070M, Canon 10x30 IS...
My observation log and ideas My General Blog
|
Anonymous
Unregistered
|
|
Probably not, my 24mm in a 14.5” f/4.3 reflector achieves with the corrector,
1.4x = 92x …2.0x = 132x…2.5x = 165x
With the Barlow,
4.1x = 268x…5.8x = 383x…7.3x = 479x
With my 11mm EP,
1.4x = 202x …2.0x = 288x…2.5x = 360x
With the Barlow,
4.1x = 585x…5.8x = 835x…7.3x = 1044x
As you can see the Barlow would not be much use with the 11mm.
The viewing site in my driveway leaves much to be desired.
I have been content to use my 24mm Pans almost exclusively. Even the 11mm Naglers seem to be a little to much with the 2x & 2.5x correction of the Power Switch.
A better viewing site will improve on that I am sure.
Bill Walters
|
Previous
Index
Next
Threaded
Edit
Reply
Quote
