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Author Topic: ERF...at last the final solution  (Read 4531 times)

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Offline NickH

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ERF...at last the final solution
« on: 11:17:24, 07 October, 2008 »
KG3 filter, which will do CaK and H-Alpha

http://www.optical-filters.com/kg3.html

80mm - £90
150mm - £175

3mm thickness, and good wavefront

That's my AR6 final jigsaw piece...

150mm Cak and H-A scope...

Not this company, I got the quote from another one, and I know KG3 works...as it's in commercial use.. :-)



Celestron C11: DSI-C/Toucam Pro 2 ICX mod and SC1.5 mod/ Meade LPI/EOS300D/ED80/WO80ZS/Shoestring guider. PST/PST CaK/ART285

No time....always bloomin cloudy...need to build the Obsy..

Offline colinsk

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Re: ERF...at last the final solution
« Reply #1 on: 03:48:16, 11 October, 2008 »
The KG-3 looks like a good solution. Is it bubble free? I have heard that the glasses like this have a hard time releasing bubbles during the melt.

Offline NickH

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Re: ERF...at last the final solution
« Reply #2 on: 15:16:36, 11 October, 2008 »
I sincerely hope it is..

Celestron C11: DSI-C/Toucam Pro 2 ICX mod and SC1.5 mod/ Meade LPI/EOS300D/ED80/WO80ZS/Shoestring guider. PST/PST CaK/ART285

No time....always bloomin cloudy...need to build the Obsy..

Offline colinsk

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Re: ERF...at last the final solution
« Reply #3 on: 17:49:21, 11 October, 2008 »
You would see them on examination. If it looks good then you found a good piece.

Offline alexthegreek

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Re: ERF...at last the final solution
« Reply #4 on: 17:28:40, 02 June, 2009 »
Hello !

 Has anyone finally used it ? Would it be a good combination with a Lunt blocking filter ?
 
  Greetings from Greece
  Alex

Offline NickH

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Re: ERF...at last the final solution
« Reply #5 on: 23:40:44, 02 June, 2009 »
Optical flatness was not up to it...

Baader is the only solution I have found which allows me to ramp up the magnification enough...

Celestron C11: DSI-C/Toucam Pro 2 ICX mod and SC1.5 mod/ Meade LPI/EOS300D/ED80/WO80ZS/Shoestring guider. PST/PST CaK/ART285

No time....always bloomin cloudy...need to build the Obsy..

Offline Nomis Elfactem

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Re: ERF...at last the final solution
« Reply #6 on: 09:27:54, 03 June, 2009 »
Hey Nick - do you have an adapter solution ? 

I seems that getting the glass is pretty straight forward but finding someone/something to mount it in for attaching to the scope is the problem ?

I like that price though !

S.
Simon

Scopes: Astro-Tech AT-111EDT Triplet, TS65ED Quad, Orion ST80, Modded PST-90 Solar Scope, PST Cak (on loan)
Cameras: SXVF H694, Atik 16ic, Canon EOS 600d, DMK41, DMK21, QHY 5L-II (mono & colour)
Accessories: SX USB Filter Wheel, SX OAG, Baader LRGB Ha SI OII Filters, SharpSky Focuser
Mount: EQ6 (EQMOD), SW Star Adventurer, plus a lot (and I mean a lot) of other bits and pieces

Offline NickH

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Re: ERF...at last the final solution
« Reply #7 on: 10:48:36, 03 June, 2009 »
It is an issue, with the great Mr Edwards out of the loop on this one...

One idea, is a piece of pipe, at the right width with some foam/glue and three holes drilled around the edge for plastic locking screws..

Other than that...it needs someone to take up the gauntlet and machine up a set at 90mm, 70mm and 102mm



Celestron C11: DSI-C/Toucam Pro 2 ICX mod and SC1.5 mod/ Meade LPI/EOS300D/ED80/WO80ZS/Shoestring guider. PST/PST CaK/ART285

No time....always bloomin cloudy...need to build the Obsy..

Offline alexthegreek

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Re: ERF...at last the final solution
« Reply #8 on: 12:16:29, 03 June, 2009 »
Thank you for the info  :)

Offline Nomis Elfactem

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Re: ERF...at last the final solution
« Reply #9 on: 12:44:28, 03 June, 2009 »
I'm guessing (actually, I'm not - I know...) that safety is the key issue here, with it being vitally important for there not to be any leakage around the ERF !  Therefore as long (and I don't say that flippantly) as the glass is securely glued in place and is slightly offset from the 90deg is there anything else that needs to be considered ? 

What about taking a standard solar film filter housing, removing the film and gluing the ERF glass into the housing ?

Also, is there anyway of testing the amount of IR/UV that is getting through the filter to check for leakage prior to actually "looking" through it ?

Sorry for all the dumb questions but I'd really like to crack this one if possible  :D

S.
Simon

Scopes: Astro-Tech AT-111EDT Triplet, TS65ED Quad, Orion ST80, Modded PST-90 Solar Scope, PST Cak (on loan)
Cameras: SXVF H694, Atik 16ic, Canon EOS 600d, DMK41, DMK21, QHY 5L-II (mono & colour)
Accessories: SX USB Filter Wheel, SX OAG, Baader LRGB Ha SI OII Filters, SharpSky Focuser
Mount: EQ6 (EQMOD), SW Star Adventurer, plus a lot (and I mean a lot) of other bits and pieces

Offline alexthegreek

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Re: ERF...at last the final solution
« Reply #10 on: 19:04:10, 03 June, 2009 »
Also, is there anyway of testing the amount of IR/UV that is getting through the filter to check for leakage prior to actually "looking" through it ?

S.
I guesss a spectrograph with a sensitivity to UV/IR would do the job . But the camera should be sensitive  in the UV/IR as well .

Offline NickH

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Re: ERF...at last the final solution
« Reply #11 on: 21:53:43, 03 June, 2009 »
solar filter with the film removed is a corking and cheap idea

Celestron C11: DSI-C/Toucam Pro 2 ICX mod and SC1.5 mod/ Meade LPI/EOS300D/ED80/WO80ZS/Shoestring guider. PST/PST CaK/ART285

No time....always bloomin cloudy...need to build the Obsy..

Offline Merlin66

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Re: ERF...at last the final solution
« Reply #12 on: 22:20:00, 03 June, 2009 »
Well I've got the spectrocope and an Atik16ic camera... if you send me the ERF I'd be pleased to test it for you ;-)

C11, C9.25 SCT, 4" Genesis, NEQ6pro, modded 1000D,  ATik314L+, DMK41AF04, SM60DS/BF15, and Spectroscopes (many!).
http://tech.groups.yahoo.com/group/astronomical_spectroscopy/
"Astronomical Spectroscopy for Amateurs", "Grating Spectroscopes-How to Use them" -Springer

Offline andrew s

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Re: ERF...at last the final solution
« Reply #13 on: 07:18:22, 04 June, 2009 »
If you are not sure about IR and UV leakage you could add a Baader UV/IR cut filter they block very well.

Also if you are gluing the ERF in place don't forget differential thermal expansion you could crack it if it's held too tight. I think you either need a flexible "glue" or a loose mechanical fitting. - Andrew

Offline colinsk

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Re: ERF...at last the final solution
« Reply #14 on: 06:57:17, 05 June, 2009 »
I have been looking at the Lunt ERFs. They are very affordable. They are coated RG630 class polished to lamda/4.

 

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