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deepskyguru
sage
Reged: 08/26/04
Posts: 245
Loc: Poway Ca. San Diego County
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I have a celestron ultima 2x barlow. Should I add a 3x or 5x to my collection? The seeing is average where I observe. I get near perfect seeing once in a while. My scope is the orion 8" f/4.9 reflector. SPC900c camera.
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Orion 8" f/4.9 reflector on LXD75 Mount with Orion 4.5" imaging reflector for guide scope.
Meade LXD55 AR5 AT
Meade DS80
Meade ETX60
Edmond Astroscan (Paid $50.00 at RTMC! one of the original Astroscans Love that little scope!!)
Meade DSI II Color, DSI Pro
http://www.scopehead.com
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isramirez
scholastic sledgehammer
Reged: 11/04/05
Posts: 762
Loc: Mexico City
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As i know you need a 5X powermate for that 8in F5 reflector 
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Santel MK91 & MK6
IntesMicro 715
Celestron SCT6 & ONIX80 EDF
Meade SN6 & AR6
Chinese 6in MakCass.Gregory
DBK + DMK + NexImage + LPI
CG-5 & LXD75 Mounts
many EP's, Barlows and Binoviewers
Great astronomic passion 
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George Bailey
member
Reged: 08/10/08
Posts: 20
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With my usual average seeing here in Iowa, I've found that my 2X Celestron Ultima barlow gives better results than my TV 3X.
A stronger barlow is nice, but you need good seeing to take advantage of it. With Jupiter at 24 degrees or lower in Iowa, and having to observe over my neighbor's roof, that doesn't happen often for me!
Location, location, location (and good weather)!
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imjeffp
Senior Space Cadet
Reged: 09/30/03
Posts: 4430
Loc: Cedar Park, Texas
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For your typical 5.6-µm-pixel webcam (NexImage, SPC900NC, DxK21), you want to image between f/20 & f/25. So yes, for your f/5 reflector, a 5x Powermate would be ideal. You could also try stacking your 2x barlow with a 2.5x Powermate.
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Blog
ST80 • AT80EDT/LXD650
ETX-90/DS-2000 • 10" LX200 Classic ("The Quarter-Meter Telescope at the Heritage Park Observatory")
SPC900NC • DMK21AF04 • Digital Rebel XT
  
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Lunatiki
Pooh-Bah
Reged: 08/07/05
Posts: 1252
Loc: Amarillo, TX
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With Jupiter, all I use is my 2x Ultima barlow. I've tried my 3x Televue barlow when I have what I consider good - excellent seeing with Jupiter, and it is just too much magnification. The results aren't that great. The only time I find a use for my 3x barlow is with Mars when its diameter is pretty small. I plan on giving Uranus a shot soon, and I'm sure I'll be using my 3x for it, but with the "big 3" of planetary imaging (Mars, Saturn, Jupiter), my 2x is now the standard with my 8 inch scope.
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Mars Watch
All images taken with:
Celestron NexStar 8i SCT
DBK 21AF04.AS
K3ccd/Registax4/PSP8
ALPO Member #4287
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