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kaaikop
sage
Reged: 07/13/08
Posts: 459
Loc: Ste-Therese, Canada
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I just realized, after upgrading to a 2" WO Dielectric star diagonal, that it wont accept the field reducer in between.
(the lens is too bulky, wont screw more than a turn inside the star diagonal).
Is there an adapter ring of some sort that would solve this?
Otherwise I would have to revert back to the original visual back +star diag.,
which at this point gets a little annoying, it will probably just stay in the accessory box...
Any experience with this?
Thanks & clear skies!
--------------------
Benoit, RASC Montreal
-C 9.25XLT on EQ6 Pro / ED80SF on Portamount
-Plossls, Radians, Naglers, LVW's & Orthos.
-a pair of 7x50's
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RAKing
scholastic sledgehammer
Reged: 12/28/07
Posts: 798
Loc: Virginia
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Quote:
I just realized, after upgrading to a 2" WO Dielectric star diagonal, that it wont accept the field reducer in between.
(the lens is too bulky, wont screw more than a turn inside the star diagonal).
Is there an adapter ring of some sort that would solve this?
Otherwise I would have to revert back to the original visual back +star diag.,
which at this point gets a little annoying, it will probably just stay in the accessory box...
Any experience with this?
Thanks & clear skies!
I'm a little confused. Is your WO an SCT diagonal? If so, the FR/FC goes directly on the back of your SCT, then the diagonal screws into that.
If your diagonal is a refractor (tube) type, then you need an adaptor. They are available from many sources. Here's a link to one:
http://www.astronomics.com/main/product.asp/catalog_name/Astronomics/category_name/FMQNRTR9001K8HFE68PKXTPEC0/product_id/7785SC
If this is your situation, you would again thread the Celestron FR/FC onto the back of the OTA, then screw this adapter in, and slip your diagonal into this tube.
Hope this answers your question,
Ron
--------------------
Time spent looking at the stars is added to your life.
"Hi Def" TV-102
C925-CF SCT "Time Machine II"
Orion XT10i / Moonlite CR2
GM-8 GEM / A-P Portable Pier
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kaaikop
sage
Reged: 07/13/08
Posts: 459
Loc: Ste-Therese, Canada
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Sorry if I was not clear, my English is not so good:
1: field reducer attaches to back of SCT tube.
2: WO star diagonal will not attach on field reducer: field reducer too bulky (or space inside WO too small to accomodate FR)
Actually, the thread will engage but only about one turn max., then the bulk of FR prevents going further.
--------------------
Benoit, RASC Montreal
-C 9.25XLT on EQ6 Pro / ED80SF on Portamount
-Plossls, Radians, Naglers, LVW's & Orthos.
-a pair of 7x50's
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coutleef
scholastic sledgehammer
Reged: 02/21/08
Posts: 806
Loc: Montreal and St-Donat, Québec,...
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I had a WO diagonal before getting it retrofitted and i used a celestron forcal reducer and never had this problem. It screwed very well on the baffle tube and on the visual back then i screwed the visual back in the diagonal (i think i did that!??)
You have to use a visual back still.
Francois
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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).
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kaaikop
sage
Reged: 07/13/08
Posts: 459
Loc: Ste-Therese, Canada
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I'm a newbie, explain why do I "need" a visual back?
The WO diagonal screws right onto the back of the tube,
is that not the way it's meant to be?
--------------------
Benoit, RASC Montreal
-C 9.25XLT on EQ6 Pro / ED80SF on Portamount
-Plossls, Radians, Naglers, LVW's & Orthos.
-a pair of 7x50's
Edited by kaaikop (07/25/08 09:17 AM)
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coutleef
scholastic sledgehammer
Reged: 02/21/08
Posts: 806
Loc: Montreal and St-Donat, Québec,...
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Not with my SCT, i still needed a visual back between the baffle tube of the OTA and the diagonal. I think that is what is missing in your set up. Usually they come with the dielectric WO diagonal.
Francois
--------------------
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).
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Midnight Dan
professor emeritus
Reged: 01/23/08
Posts: 554
Loc: Brockport, NY
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Kaaikop:
You should only need a visual back if your diagonal has a straight barrel that fits into a visual back. If your diagonal has an SCT treaded ring (and it sound like your does) then you shouldn't need a visual back.
But I'm not quite understanding why the WO diagonal will not screw onto the Focal Reducer. Can you explain a little more about that connection and what seems to be the problem there? You say it only screws on by one thread. When this happens, can you see additional thread still exposed on the Focal Reducer? Or is the WO screw ring completely covering the threads and hitting the back of the Focal Reducer?
-Dan
--------------------
Scopes: Celestron NexStar 8, Orion EON 72mm ED/APO on Astroview mount (EQ3)
Eyepieces: Celestron 40mm, 25mm, Baader Hyperion 13mm, 8mm, 5mm
Other: Telrad, 2x Barlow, 0.63x Focal Reducer, Dew-not strips, DewBuster controller
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rmollise
Carpal Tunnel
Reged: 07/06/07
Posts: 1542
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Quote:
I'm a newbie, explain why do I "need" a visual back?
The WO diagonal screws right onto the back of the tube,
is that not the way it's meant to be?
You don't. The WO SCT diagonal should screw right on to your reducer/corrector. Try a little lubrication...going over the threads on the reducer with a soft pencil. That may do the trick (I've had similar problems with the Celestron reducer over the years).
--------------------
Uncle Rod
Watch for Rod's New Book:
Choosing and Using the New CATs--coming soon!
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kaaikop
sage
Reged: 07/13/08
Posts: 459
Loc: Ste-Therese, Canada
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Dan, we are getting closer.
I am trying to get a good picture...
--------------------
Benoit, RASC Montreal
-C 9.25XLT on EQ6 Pro / ED80SF on Portamount
-Plossls, Radians, Naglers, LVW's & Orthos.
-a pair of 7x50's
|
coutleef
scholastic sledgehammer
Reged: 02/21/08
Posts: 806
Loc: Montreal and St-Donat, Québec,...
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Thanks, i had not realized that and had clearance issues since i have retrofitted my WO diagonal with a powerswitch.
If i could get rid of the visual back and screw the diagonal directly on the baffle tube, then i would solve it.
Francois
--------------------
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).
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kaaikop
sage
Reged: 07/13/08
Posts: 459
Loc: Ste-Therese, Canada
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Okay, here we go: 
--------------------
Benoit, RASC Montreal
-C 9.25XLT on EQ6 Pro / ED80SF on Portamount
-Plossls, Radians, Naglers, LVW's & Orthos.
-a pair of 7x50's
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coutleef
scholastic sledgehammer
Reged: 02/21/08
Posts: 806
Loc: Montreal and St-Donat, Québec,...
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It is strage, as i have the same diagonal with the same visual back and owned the same reducer as you have, and never had a problem screwing the reducer in the visual back. It was sometimes difficult and needed to be careful or else it would not screw in correctly but by trying it a couple of times, it would fit in nicely.
Francois
--------------------
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).
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Midnight Dan
professor emeritus
Reged: 01/23/08
Posts: 554
Loc: Brockport, NY
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Excellent picture! That non-threaded piece sticking out of the Celestron Focal reducer is clearly the problem. Seems odd that it's there. I have a Mead Focal Reducer which I use on my Celextron NexStar 8 and it does NOT have that part.
Is the Focal Reducer new? If so, maybe you could send it back and get a different brand? Probably the only other option would be to return the WO diagonal and get a Celestron one. I would hope the Celestron parts would be designed to go together. That would be an unfortunate way to go because the WO diagonals have a good reputation.
-Dan
--------------------
Scopes: Celestron NexStar 8, Orion EON 72mm ED/APO on Astroview mount (EQ3)
Eyepieces: Celestron 40mm, 25mm, Baader Hyperion 13mm, 8mm, 5mm
Other: Telrad, 2x Barlow, 0.63x Focal Reducer, Dew-not strips, DewBuster controller
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Midnight Dan
professor emeritus
Reged: 01/23/08
Posts: 554
Loc: Brockport, NY
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Francois:
Any chance you can post a picture of your setup? I'm a little confused by what you're saying. You say you have the same visual back, but he does not have a visual back at all.
-Dan
--------------------
Scopes: Celestron NexStar 8, Orion EON 72mm ED/APO on Astroview mount (EQ3)
Eyepieces: Celestron 40mm, 25mm, Baader Hyperion 13mm, 8mm, 5mm
Other: Telrad, 2x Barlow, 0.63x Focal Reducer, Dew-not strips, DewBuster controller
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rmollise
Carpal Tunnel
Reged: 07/06/07
Posts: 1542
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Quote:
Thanks, i had not realized that and had clearance issues since i have retrofitted my WO diagonal with a powerswitch.
If i could get rid of the visual back and screw the diagonal directly on the baffle tube, then i would solve it.
Francois
Well, you can't. Without that threaded ring/built in visual back there is nothing to screw onto the scope's rear port. If there is an obstruction, I suggest you contact WO. They are very good about such things.
--------------------
Uncle Rod
Watch for Rod's New Book:
Choosing and Using the New CATs--coming soon!
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kaaikop
sage
Reged: 07/13/08
Posts: 459
Loc: Ste-Therese, Canada
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Quote:
Well, you can't. Without that threaded ring/built in visual back there is nothing to screw onto the scope's rear port. If there is an obstruction, I suggest you contact WO. They are very good about such things.
Great idea, e-mail sent to WO.
After all they must have seen that before.
--------------------
Benoit, RASC Montreal
-C 9.25XLT on EQ6 Pro / ED80SF on Portamount
-Plossls, Radians, Naglers, LVW's & Orthos.
-a pair of 7x50's
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RAKing
scholastic sledgehammer
Reged: 12/28/07
Posts: 798
Loc: Virginia
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Quote:
Okay, here we go:
You must have a problem with the threads on the WO diagonal. Here is a picture of my FR/FC with an SCT diagonal.
The "obstruction" you labeled on your diagonal is the retaining ring. It keeps the threaded ring from falling off and holds the diagonal against the VB (or FR).
There is no problem with your FR/FC. That is the way they are made.
I would double check your threads. They should go together easily.
Ron
--------------------
Time spent looking at the stars is added to your life.
"Hi Def" TV-102
C925-CF SCT "Time Machine II"
Orion XT10i / Moonlite CR2
GM-8 GEM / A-P Portable Pier
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RAKing
scholastic sledgehammer
Reged: 12/28/07
Posts: 798
Loc: Virginia
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Just so we are clear about how the final product looks.
From left to right: the OTA, the FR/FC, and finally the diagonal. The FR screws onto the back of the SCT OTA. Then you screw the diagonal onto the FR. These things should go together easily. If not, then something is cross-threaded or munged up.
Hope this helps,
Ron
--------------------
Time spent looking at the stars is added to your life.
"Hi Def" TV-102
C925-CF SCT "Time Machine II"
Orion XT10i / Moonlite CR2
GM-8 GEM / A-P Portable Pier
|
coutleef
scholastic sledgehammer
Reged: 02/21/08
Posts: 806
Loc: Montreal and St-Donat, Québec,...
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I thougth he has a visual back screwed in his diagonal. Perhaps that should not be called a visual back! but my set up is exactly like the picture that is shown in the post above by Rakin. And he wrote nicely what i think happens, there is nothing wrong with the reducer and he does not need to change companies. I had sometimes problems screwing the reducer in the 'visual back versus adapter ring' that came with the diagonal. I had to try a couple of times and it would screw in correctly. I would be a little worried that doing that several times could resulting in unthreading of one of the components and that is why I left the reducer on most of the time and then i replaced the reducer with a Denk powerswitch.
I did not want to bring confusion.
Francois
--------------------
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).
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Midnight Dan
professor emeritus
Reged: 01/23/08
Posts: 554
Loc: Brockport, NY
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Hi Francois:
A visual back has a threaded ring on one side, and a tub on the other. The threaded ring screws onto the back of the SCT, and the tube accepts accessories that have a barrel, like an Eyepiece, or some diagonals (one's with barrels), some photo equipment. The Visual Back's tube has a couple of thumb screws so that when you instert the accessory, you tighten the thumbscrew to secure it - just like tightening the thumbscrew where you put your eyepiece in. So a visual back is essentially an adapter from the SCT threads to a thumbscrew tube.
Some accessories don't need a visual back because they screw right onto the back of the SCT without needing an adapter. The Focal Reducer is one such accessory. Some diagonals also screw right on the back so you don't need the visual back.
Most (not all) SCTs sold today are setup like this:
SCT -> Visual Back -> Diagonal -> Eyepiece
Adding a Focal Reducer will make the setup like this:
SCT -> Focal Reducer -> Visual Back -> Diagonal -> Eyepiece
If you have an SCT threaded diagonal (as shown in the photos above), then the norma setup is (note no visual back):
SCT -> Diagonal -> Eyepiece
Adding a Focal Reducer:
SCT -> Focal Reducer -> Diagonal -> Eyepiece
-Dan
--------------------
Scopes: Celestron NexStar 8, Orion EON 72mm ED/APO on Astroview mount (EQ3)
Eyepieces: Celestron 40mm, 25mm, Baader Hyperion 13mm, 8mm, 5mm
Other: Telrad, 2x Barlow, 0.63x Focal Reducer, Dew-not strips, DewBuster controller
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