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NightVisions
member
Reged: 10/20/06
Posts: 32
Loc: Sandy, OR
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I was looking at my DSI Pro, and my eyepieces, and wondering how I'm going to put the two together to get higher magnification shots. I don't see how I'd tie the two together. Additionally, most of my eyepieces are 2". I'll continue to search in the forum, but not finding anything yet.
Also, is it typical practice to use Barlows to get the closer in shots, say like for Saturn? How does the quality of such barlow affect the images? I've seen APO barlows, and barlows of all sorts. What's a good rule for selecting a barlow for this use? Thanks.
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LXD75 SN-8AT (F/4) w/ UHTC
Deep Sky Imager Pro
Canon EOS Elan 7e
Eye Pieces:
Orion 8mm Stratus
GS0 2" 42mm Superview
Meade Super Plossl 26mm
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Chris_H
Carpal Tunnel
Reged: 11/24/03
Posts: 2858
Loc: Norway
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Get a good quality barlow instead, like a 2x or 3x Televue. cheap low quality barlows are better doorstoppers 
Yes 97% of all imagers use barlows or powermates to get a bigger image scale. I have an Meade APO barlow and my Televue barlow hammers it. Just because it says APO doesnt mean its better
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Chris
"Big Papa Smurf" (254mm f/4.7 Sky-Watcher Newt)
Custom Orion Optics 150mm f/8 reflektor "Planet Killer" (On its way!!!)
SPC900
Canon Powershot A610 (CHDK modded)
Canon 10D (modded)
Canon EF 50mm f/1.8 II
Canon EF 70-200mm f/4 USM L
My Website
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NightVisions
member
Reged: 10/20/06
Posts: 32
Loc: Sandy, OR
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Oh, so the Barlow is ALL that's really used in many shots then. I knew eyepiece projection was one method, but there are many things my wife and I have to learn. That clears up a good deal on the Barlows. (I'll have to start reading reviews on Barlows I guess, unless I go with the method of the more money it costs, the better it must be).
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_____________________________________
LXD75 SN-8AT (F/4) w/ UHTC
Deep Sky Imager Pro
Canon EOS Elan 7e
Eye Pieces:
Orion 8mm Stratus
GS0 2" 42mm Superview
Meade Super Plossl 26mm
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Chris_H
Carpal Tunnel
Reged: 11/24/03
Posts: 2858
Loc: Norway
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Well there are a lot of nice Barlows out there. A good guide would be Excelsis. Now, I say guide because there are some weird reviews in here but it should help you sort out the lemons anyway
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Chris
"Big Papa Smurf" (254mm f/4.7 Sky-Watcher Newt)
Custom Orion Optics 150mm f/8 reflektor "Planet Killer" (On its way!!!)
SPC900
Canon Powershot A610 (CHDK modded)
Canon 10D (modded)
Canon EF 50mm f/1.8 II
Canon EF 70-200mm f/4 USM L
My Website
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nik hodges
professor emeritus
Reged: 04/20/07
Posts: 633
Loc: UK
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telextenders would also work both meade and televue make them but they are more expensive
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Flurostar 110 [TMB] with TAK TOA/FS 0.75 reducer
Megrez 80mm triplet apo & mkIII FF
"LX200R" (8") with AP CCDT67 reducer & moonlight focuser
StarlightXpress SXVF-H16 camera/trutek filter wheel
DSI Pro II
Maxim DL/Maxpoint + adobe PS3extended
On AP900 notification list
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jgraham
Postmaster
Reged: 12/02/04
Posts: 5367
Loc: Dayton, Ohio
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What you're looking for is called an eyepiece projection adapter. They were common when film was in wide spread use, but not so much anymore. I have one, but I much prefer to use a Barlow or a Powermate. You might be able to make an eyepiece projection adapter from PVC plumbing parts. What you need is a 1-1/4" drain pipe adapter to mout onto the DSI Pro converted to something that will grab onto your projection eyepiece. The magnification factor will be approximately the projection distance divided by the focal length of the eyepiece.
-John
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-John
================================================
Homebuilt scopes from 4.25-16.5"
Meade LXD75-N6/SN6/SC8, DSX-90, ETX-60BB, ETX-125PE, DS-2130
Orion StarBlast, BinoViewers, Coronado PST
Rebel XT/XTi, DSI Pro (I & II), DSI, LPI, Electronic Eyepiece, Phillips SPC900NC
Tasco 60mm Refractors
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Dr Nick
scholastic sledgehammer
Reged: 01/27/06
Posts: 798
Loc: Glen Innes, NSW, Australia
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I only ever add a barlow for more magnification...
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Clear Skies, Nick
http://www.NicksAstronomy.com
Sky Watcher 8" f/5 Newtonian(which I got when I was 10yrs old and 5yrs later I'm still adding to) w/JMI motofocus/standard, axis guider.
ToUcam Pro w/Phillips vlounge/registax/and Virtual Dub,
DSI Pro II w/envisage/photoshop cs2/,
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NightVisions
member
Reged: 10/20/06
Posts: 32
Loc: Sandy, OR
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I get what a Barlow is, but not a "Powermate". I looked at the Excelsis site and the powermate does the same thing, but cost twice as much between the Televue Barlow and Powermate?
[edit] Just looked up more info on the Tele Vue site. That makes more sense now. Another question came to mind regarding the DSI though. What's the focal length of the DSI pro?
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_____________________________________
LXD75 SN-8AT (F/4) w/ UHTC
Deep Sky Imager Pro
Canon EOS Elan 7e
Eye Pieces:
Orion 8mm Stratus
GS0 2" 42mm Superview
Meade Super Plossl 26mm
Edited by NightVisions (04/25/07 02:20 AM)
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russ_watters
Pooh-Bah
Reged: 11/24/04
Posts: 1227
Loc: Trappe, PA
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A camera with no lenses doesn't have a focal length. If you are asking how to calculate magnification, it depends on how you display the image, so I usually scale my images based on print size or viewing size on a monitor and use a little trig to calculate it.
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Equipment: Orion Atlas 11, ED80, DSI-C, DSI II Pro, Dell Inspiron Laptop.
www.russsscope.net
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NightVisions
member
Reged: 10/20/06
Posts: 32
Loc: Sandy, OR
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Yes, I was trying to figure out magnification. Trying to get as close to 200 magnificication as possible with the DSI Pro, and wasn't sure if I'd need a 2x, 2.5x, or 3x et cetera to get there. Such a great hobby.
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_____________________________________
LXD75 SN-8AT (F/4) w/ UHTC
Deep Sky Imager Pro
Canon EOS Elan 7e
Eye Pieces:
Orion 8mm Stratus
GS0 2" 42mm Superview
Meade Super Plossl 26mm
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jgraham
Postmaster
Reged: 12/02/04
Posts: 5367
Loc: Dayton, Ohio
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From what I can gather a Powermate is really just a self-contained eyepiece projection system; a very good projection 'eyepiece' built into an extension tube. I had a chance to compare a 5x Powermate with my adjustable eyepiece projection unit and I really liked the Powermate. My old eyepiece projection unit is versatile (I can use several different projection eyepiece), but in comparison the Powermate is much lighter, compact, and does a very nice job.
-John
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-John
================================================
Homebuilt scopes from 4.25-16.5"
Meade LXD75-N6/SN6/SC8, DSX-90, ETX-60BB, ETX-125PE, DS-2130
Orion StarBlast, BinoViewers, Coronado PST
Rebel XT/XTi, DSI Pro (I & II), DSI, LPI, Electronic Eyepiece, Phillips SPC900NC
Tasco 60mm Refractors
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