|
hammerhead
professor emeritus
Reged: 02/18/07
Posts: 737
Loc: MA
|
|
I've found that a few EP's don't like to reach focus in my CPC 1100 when using an f6.3 reducer/corrector in conjunction with my 2" TV VB and 2" diagonal. I'm wondering if someone could recommend a couple of EPs for me in the 30mm to 40mm range that they know will achieve focus with my set up? I was thinking about the 33mm WO SWAN and the 40mm WO SWAN. I'd prefer a 70 degree AFOV if possible.
Thanks!
--------------------
-Brian
CPC 1100
Televue TV-85
WO Megrez 110ED
Televue Gibraltar with Sky Tour
31mmT5, 26mmT5, 20mmT5, 13Ethos, 10mmXW, 7mmXW, and 5mmXW
Oberwork 15X70, Coronado 10x25 Solar, Orion 7x50.
|
mikiek
scholastic sledgehammer
Reged: 10/10/07
Posts: 925
Loc: SE Texas
|
|
Not sure why your not getting focus but EPs at that FL will tend to show a secondary shadow with the FR. My Pan35 shows it pretty bad (although you do get used to it), the Pan27 shows it a little(you have to look for it). Everything shorter than that has no problems.
Not sure if the shadow is actually the secondary or possibly due to a reduced exit pupil, but it is noticable especially on brighter targets.
--------------------
___________________________________________________________
May there always be starlight on the path - R.Burnham
___________________________________________________________
Celestron CPC 1100
Radian 3mm, 5mm, 8mm, 12mm
Panoptic 22mm, 27mm, 35mm(the brick), 41mm (the cinder block)
Nagler 3-6 zoom, T4 17mm
Ethos 13mm
Everbrite Diagonal 2", Powermate 2X
FeatherTouch Crayford, Microfocuser
Telrad Finder, SV 9x50 RACI
Kendrick Dew System
TV NP-101(riding the CPC)
|
btieman
super member
Reged: 07/24/08
Posts: 114
|
|
I can see the secondary shadow on my CPC1100 with just the stock 40mm when looking at a bright target like the moon. The FR might make the problem worse, but I don't think it's caused by the FR.
--------------------
CPC 1100
Meade DSI Pro
|
hammerhead
professor emeritus
Reged: 02/18/07
Posts: 737
Loc: MA
|
|
Hmmmmm.... I'd really love an EP with around a 70 degree AFOV and around 50x mag. Would even settle for 60x-ish. I'm wonder what my options are then? Maybe none? Bummer. What the heck does everyone use for low power/wide field type views? Right now the best I can do is about 68x using a 26T5 and focal reducer. Is this as low as I'm gonna be able to go?
--------------------
-Brian
CPC 1100
Televue TV-85
WO Megrez 110ED
Televue Gibraltar with Sky Tour
31mmT5, 26mmT5, 20mmT5, 13Ethos, 10mmXW, 7mmXW, and 5mmXW
Oberwork 15X70, Coronado 10x25 Solar, Orion 7x50.
|
Lee Jay
sage
Reged: 02/27/08
Posts: 419
Loc: Westminster, CO
|
|
Quote:
What the heck does everyone use for low power/wide field type views?
A small refractor.
|
hammerhead
professor emeritus
Reged: 02/18/07
Posts: 737
Loc: MA
|
|
LOL... yeah, I guess that may be my answer.
--------------------
-Brian
CPC 1100
Televue TV-85
WO Megrez 110ED
Televue Gibraltar with Sky Tour
31mmT5, 26mmT5, 20mmT5, 13Ethos, 10mmXW, 7mmXW, and 5mmXW
Oberwork 15X70, Coronado 10x25 Solar, Orion 7x50.
|
mikiek
scholastic sledgehammer
Reged: 10/10/07
Posts: 925
Loc: SE Texas
|
|
The refractor is certainly a good option. That's what I did. Since then (about 8 months) I've used the FR once.
Seems like we - and I include myself - buy these scopes and then start trying to make them into something they are not. Lets face it, the design of the SCT does not support wide field observing as well as a small refractor.
My only gripe with the refractor, is the difference between a 3" aperture and 11". There is NO comparison - duh. A lot of the wide field objects I would like to observe with the 3" are barely visible, even though I can see the target (partially) well with the CPC. If I had it to do over again I would have bought a 4" refractor.
--------------------
___________________________________________________________
May there always be starlight on the path - R.Burnham
___________________________________________________________
Celestron CPC 1100
Radian 3mm, 5mm, 8mm, 12mm
Panoptic 22mm, 27mm, 35mm(the brick), 41mm (the cinder block)
Nagler 3-6 zoom, T4 17mm
Ethos 13mm
Everbrite Diagonal 2", Powermate 2X
FeatherTouch Crayford, Microfocuser
Telrad Finder, SV 9x50 RACI
Kendrick Dew System
TV NP-101(riding the CPC)
|
rboe
Numbfinger
Reged: 03/16/02
Posts: 39729
Loc: Phx, AZ
|
|
There is just not that much difference between a 3" and 4" refractor. So what we need is a good 11" refractor. 
I have some 70mm binoculars that do very well for really wide field views. I buddy has a his mounted on a flip mirror. In turn a green laser pointer is mounted to this. When he finds something he hits the laser then uses that to move his primary scope to what the binoculars found.
I've done the same thing by placing the laser in the edge of the counter weight rail. That way I can use the NS11 for GOTO, then move the big dob into play. 
--------------------
Ron
NS11GPS
Pronto
16" dob
15X70 Obies
|
mclewis1
Thread Killer
Reged: 02/25/06
Posts: 2454
Loc: Colorado
|
|
I'll use my 6.3 FR with 1.25" eyepieces but not 2" ones. My 2" eyepieces are the 35mm Pan and 40mm Paragon. I use the 35mm Pan "natively" (no FR) quite a bit with the C11. The 40mm Paragon is used in my refractors more often.
If you're willing to spend the money on getting the best possible FOV in a C11 go with the AP 2" visual back, an AP or TV 2" diagonal (largest clear aperture) and an eyepiece with a 46-47mm field stop (31mm Nagler, 40mm Paragon, or 41mm Panoptic to name a few).
--------------------
Mark
C11, C6, APM/TMB115, and AT80ED
Tandem mount CGE and CG-5A, WO EZ-Touch and AT Voyager
25x100s, 8x56s, T-Mount Light, and Mark 1 eyeballs
Modded 350D, SPC900, Mallincam
|
hammerhead
professor emeritus
Reged: 02/18/07
Posts: 737
Loc: MA
|
|
I was thinking of getting an 80mm EON to piggy-back on the CPC-1100 any way. I've already got a Megrez 110 but I figured that to be too heavy for piggy-backing on the 1100.
Two mounts out at once is kind of out of the question for me. Just not enough hours in the day for me. I'm thrilled if I can find a few hours during the week to observe. Weekends are about the only time I get any real long sessions in and even then I don't think I'd want to set up more than the one mount.
--------------------
-Brian
CPC 1100
Televue TV-85
WO Megrez 110ED
Televue Gibraltar with Sky Tour
31mmT5, 26mmT5, 20mmT5, 13Ethos, 10mmXW, 7mmXW, and 5mmXW
Oberwork 15X70, Coronado 10x25 Solar, Orion 7x50.
|
hammerhead
professor emeritus
Reged: 02/18/07
Posts: 737
Loc: MA
|
|
Quote:
I'll use my 6.3 FR with 1.25" eyepieces but not 2" ones. My 2" eyepieces are the 35mm Pan and 40mm Paragon. I use the 35mm Pan "natively" (no FR) quite a bit with the C11. The 40mm Paragon is used in my refractors more often.
If you're willing to spend the money on getting the best possible FOV in a C11 go with the AP 2" visual back, an AP or TV 2" diagonal (largest clear aperture) and an eyepiece with a 46-47mm field stop (31mm Nagler, 40mm Paragon, or 41mm Panoptic to name a few).
Any idea who's selling the Paragon's? I fished around a bit and came up empty handed. Like an idiot I recently got rid of my 31T5. But really, I think I'd like something closer to 40mm anyway. Wonder how the SWAN is? I'll have to pass on the AP and TV diagonals... just ordered a Denkmeier 2" Power X Switch #S1 Star Diagonal.
Another question... can I not reach focus with the reducer and 30mm or 40mm EP simply because of the long optical train? Or is this an exit pupil issue or something? Sorry if that's a dumb question, but I'm still learning.
--------------------
-Brian
CPC 1100
Televue TV-85
WO Megrez 110ED
Televue Gibraltar with Sky Tour
31mmT5, 26mmT5, 20mmT5, 13Ethos, 10mmXW, 7mmXW, and 5mmXW
Oberwork 15X70, Coronado 10x25 Solar, Orion 7x50.
|
mikiek
scholastic sledgehammer
Reged: 10/10/07
Posts: 925
Loc: SE Texas
|
|
Mark - all good suggestions but all under 1º TFOV, which means, at least for me, not enough sky. That's why I 'put up with' the 3º-5º TFOV of the small aperture refractor.
--------------------
___________________________________________________________
May there always be starlight on the path - R.Burnham
___________________________________________________________
Celestron CPC 1100
Radian 3mm, 5mm, 8mm, 12mm
Panoptic 22mm, 27mm, 35mm(the brick), 41mm (the cinder block)
Nagler 3-6 zoom, T4 17mm
Ethos 13mm
Everbrite Diagonal 2", Powermate 2X
FeatherTouch Crayford, Microfocuser
Telrad Finder, SV 9x50 RACI
Kendrick Dew System
TV NP-101(riding the CPC)
|
mikiek
scholastic sledgehammer
Reged: 10/10/07
Posts: 925
Loc: SE Texas
|
|
The 110 is definately NOT too big for an 1100!
--------------------
___________________________________________________________
May there always be starlight on the path - R.Burnham
___________________________________________________________
Celestron CPC 1100
Radian 3mm, 5mm, 8mm, 12mm
Panoptic 22mm, 27mm, 35mm(the brick), 41mm (the cinder block)
Nagler 3-6 zoom, T4 17mm
Ethos 13mm
Everbrite Diagonal 2", Powermate 2X
FeatherTouch Crayford, Microfocuser
Telrad Finder, SV 9x50 RACI
Kendrick Dew System
TV NP-101(riding the CPC)
|
hammerhead
professor emeritus
Reged: 02/18/07
Posts: 737
Loc: MA
|
|
Quote:
The 110 is definately NOT too big for an 1100!
No kidding? How much counterweight do you guess I'd need? Assuming I was using a Telrad as a finder, a Denk powerswitch diagonal, and 2" EP's in both scopes? Any idea? It really wouldn't kill the gears prematurely?
(and I appreciate your help!)
--------------------
-Brian
CPC 1100
Televue TV-85
WO Megrez 110ED
Televue Gibraltar with Sky Tour
31mmT5, 26mmT5, 20mmT5, 13Ethos, 10mmXW, 7mmXW, and 5mmXW
Oberwork 15X70, Coronado 10x25 Solar, Orion 7x50.
|
Lee Jay
sage
Reged: 02/27/08
Posts: 419
Loc: Westminster, CO
|
|
Quote:
There is just not that much difference between a 3" and 4" refractor. So what we need is a good 11" refractor.
It'll come with wheels (lots of wheels), and a mortgage.
Big aperture, wide-field = Fast Newtonian.
|
Lee Jay
sage
Reged: 02/27/08
Posts: 419
Loc: Westminster, CO
|
|
Quote:
I was thinking of getting an 80mm EON to piggy-back on the CPC-1100 any way. I've already got a Megrez 110 but I figured that to be too heavy for piggy-backing on the 1100.
The EON 72 is on sale right now. But, yeah, if you can get your 110 on there okay, I think you're done!
|
mikiek
scholastic sledgehammer
Reged: 10/10/07
Posts: 925
Loc: SE Texas
|
|
I originally bought my 80mm refractor because I was concerned about the weight. However after getting it all set up and using it for a while I believe a 100-115mm would be just fine. I'm debating which one right now.
I run the refractor (2" diag and heavy EPs), a 50mm RACI and Telrad on top along with a crayford focuser, a 2" diag and heavy EPs on the CPC. I use 12.5 lbs on the bottom rail (no top weights). After balancing, the drives move very smoothly and IMHO could easily handle the extra 2-3 lbs of a 4" refractor.
--------------------
___________________________________________________________
May there always be starlight on the path - R.Burnham
___________________________________________________________
Celestron CPC 1100
Radian 3mm, 5mm, 8mm, 12mm
Panoptic 22mm, 27mm, 35mm(the brick), 41mm (the cinder block)
Nagler 3-6 zoom, T4 17mm
Ethos 13mm
Everbrite Diagonal 2", Powermate 2X
FeatherTouch Crayford, Microfocuser
Telrad Finder, SV 9x50 RACI
Kendrick Dew System
TV NP-101(riding the CPC)
|
rboe
Numbfinger
Reged: 03/16/02
Posts: 39729
Loc: Phx, AZ
|
|
Your scope, if balanced, should handle the extra weight just fine.
A big TeleVue 4" refractor may be pushing things a wee bit but still doeable. My pronto is handled easily and I've seen the TV85 used with no problem.
--------------------
Ron
NS11GPS
Pronto
16" dob
15X70 Obies
|
mclewis1
Thread Killer
Reged: 02/25/06
Posts: 2454
Loc: Colorado
|
|
Quote:
Mark - all good suggestions but all under 1º TFOV, which means, at least for me, not enough sky. That's why I 'put up with' the 3º-5º TFOV of the small aperture refractor.
Yeah, me too. I also think I should have added the comment that those type of changes to a C11 are more like splitting hairs rather than making great increases in the field of view.
I really have to re think my definition of "wide field" ... with the refractor it's more like a "really really wide field" and with the SCT it's "not so much".
--------------------
Mark
C11, C6, APM/TMB115, and AT80ED
Tandem mount CGE and CG-5A, WO EZ-Touch and AT Voyager
25x100s, 8x56s, T-Mount Light, and Mark 1 eyeballs
Modded 350D, SPC900, Mallincam
|
coutleef
scholastic sledgehammer
Reged: 02/21/08
Posts: 823
Loc: Montreal and St-Donat, Québec,...
|
|
Quote:
But really, I think I'd like something closer to 40mm anyway. Wonder how the SWAN is? I'll have to pass on the AP and TV diagonals... just ordered a Denkmeier 2" Power X Switch #S1 Star Diagonal.
I own a 40mm Swan from WO. For the price it is a very nice EP. I use it with a 8SE and never tried it on a CPC. Gives me 50x without reducer and 32x with reducer. Now, i more often use a 22Pan with the reducer (60x), sharp to the edge and great contrast.
The 40mm Swan is a good EP but cannot be compared to Pans or Naglers. Are you sure there will be that much of a difference between your 26T5 with focal reducer (60X) and an EP giving 50x? I have this combination and i am always going at 60x, especially when i use it in the city because of light pollution.
--------------------
François
Nexstar 8 SE
50mm StellarVue finderscope, Astronomik UHC-E and Orion OIII filters
WO Swan 40mm; TV Pan 22mm; TV Nagler 9T6, 12T4, 17T4; TV Plossl 11mm and 15mm.
WO 2" dielectric diagonal retrofitted with Denk Power Switch (and now reach the zenith with the shorty adapter).
|
|
1 registered and 2 anonymous users are browsing this forum.
Moderator: Charlie Hein, Greg K.
Print Thread
|
Forum Permissions
You cannot start new topics
You cannot reply to topics
HTML is disabled
UBBCode is enabled
|
Thread views: 429
|
|
|
|
|
|
|
Previous
Index
Next
Threaded
Edit
Reply
Quote
[Re: 