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Pages: 1 | 2 | 3 | 4 | (show all) Substrate member Reged: 10/17/12 Re: My LS60FHa just came in... [Re: REC]       #5728238 - 03/12/13 01:59 PM Edit   Reply   Quote Quick Reply   Eye contact is over-rated Post Extras:       BYoesle Post Laureate Reged: 06/12/04 Loc: Washington USA Re: My LS60FHa just came in... [Re: Substrate]       #5728257 - 03/12/13 02:11 PM Attachment (18 downloads) Edit   Reply   Quote Quick Reply   "If there are no eyes, avoid all contact." Firesign Theatre Everything You Know Is Wrong My favorite album from 1974: Post Extras:       Bill Cowles MacGyver Reged: 04/16/06 Loc: Utah Re: My LS60FHa just came in... [Re: REC]       #5728267 - 03/12/13 02:20 PM Edit   Reply   Quote Quick Reply   Bill Post Extras:       Kent10 professor emeritus Reged: 05/08/12 Re: My LS60FHa just came in... [Re: Bill Cowles]       #5737836 - 03/17/13 12:47 AM Edit   Reply   Quote Quick Reply   Hi Preston: Have you tried removing the ERF yet. I have an LS100F for my LS100 and am looking into doing the same thing. Thanks, Kent Post Extras:       mhilscher member Reged: 07/13/11 Loc: Cologne, Germany Re: My LS60FHa just came in... [Re: Kent10]       #5737901 - 03/17/13 01:45 AM Edit   Reply   Quote Quick Reply   Yes, I am curious as well, I have the LS60 double stack and want to do the same, perhaps you can post a picture- thanks. matthew Post Extras:       mhilscher member Reged: 07/13/11 Loc: Cologne, Germany Re: My LS60FHa just came in... [Re: REC]       #5742435 - 03/19/13 08:38 AM Edit   Reply   Quote Quick Reply   Hello Bob, Bill and others... I am somewhat amazed and dumbfounded, I read this post last weekend, and upon reflection…I am a little concerned, let me say why. It seems to me that many owners of Lunt systems, have decided on a double stack set-up, I have read (as we all do) post after post on…folks asking the question, should I double-stack, …will the image be darker, etc. … and only now, due to Bob’s very help description, “I’d remove the LS60F’s ERF.”, that awakened in me, why are not the streams of other Lunt double-stack owners making the improvement to remove the redundant ERF red glass, to get the slightly brighter image, that we would all crave from the 60mm? Which invited the second question, why does not Lunt itself offer an option for exclusive double-stakers, a set up with only clear glass. I will start a new thread, and post my pictures, but I am strongly considering the modification, if I can get it done, simply leaving the etalon exposed seems, far too risky, but a replacement of the dark red ERF with some clear protection (and yes a hood for improved light blocking), for increased brightness seems like a no-brainer? Where are the voices of other Lunt 60 double stakers?? has any one thoughts?? Matthew Post Extras:       mhilscher member Reged: 07/13/11 Loc: Cologne, Germany Re: My LS60FHa just came in... [Re: mhilscher]       #5742704 - 03/19/13 11:24 AM Attachment (14 downloads) Edit   Reply   Quote Quick Reply   exposure images Post Extras:       mhilscher member Reged: 07/13/11 Loc: Cologne, Germany Re: My LS60FHa just came in... [Re: mhilscher]       #5742711 - 03/19/13 11:29 AM Attachment (14 downloads) Edit   Reply   Quote Quick Reply   removal Post Extras:       mhilscher member Reged: 07/13/11 Loc: Cologne, Germany Re: My LS60FHa just came in... [Re: mhilscher]       #5742718 - 03/19/13 11:34 AM Attachment (12 downloads) Edit   Reply   Quote Quick Reply   double stack...double filter Post Extras:       mhilscher member Reged: 07/13/11 Loc: Cologne, Germany Re: My LS60FHa just came in... [Re: mhilscher]       #5742729 - 03/19/13 11:37 AM Attachment (14 downloads) Edit   Reply   Quote Quick Reply   ERF redundancy ? Post Extras:       kimsc321 super member Reged: 01/22/06 Loc: New Milford, NJ Re: My LS60FHa just came in... [Re: mhilscher]       #5743851 - 03/19/13 07:40 PM Edit   Reply   Quote Quick Reply   CAUTION------------- If you remove internal ERF filter for the double stacked system to increase the brightness please, please, please DO NOT LOOK THROUGH THE EP-END WHILE THE SECOND FILTER IS UNSCREWED OR REMOVED....I know its commonsense but, I sometimes tune the scope first, and then optimize the DS filter. Especially if one decide to sell their unit in the future, put the internal filter back in or make sure the buyer know what has been done..... Steven Post Extras:       Kent10 professor emeritus Reged: 05/08/12 Re: My LS60FHa just came in... [Re: kimsc321]       #5744321 - 03/20/13 01:28 AM Edit   Reply   Quote Quick Reply   Thanks for those pictures, Matthew. I am on holiday away from my scope so I can't look to see how it might be done but I hope the removal was easy and "obvious" because I would like to try it on my LS100F. How were your views? Do you notice a nice improvement on light transmission. Thanks again. Post Extras:       mhilscher member Reged: 07/13/11 Loc: Cologne, Germany Re: My LS60FHa just came in... [Re: Kent10]       #5754403 - 03/24/13 04:36 PM Edit   Reply   Quote Quick Reply   Also on holiday for two weeks, did not try the scope without the ERF filter yet, would like some kind of protective clear glass in its place...any ideas? matthew Post Extras:       Kent10 professor emeritus Reged: 05/08/12 Re: My LS60FHa just came in... [Re: mhilscher]       #5754701 - 03/24/13 06:35 PM Edit   Reply   Quote Quick Reply   Hi Matthew: I hope you had a great holiday. Ours was very nice. I just did some more viewing and I am anxious to get that ERF filter off when I have more time and feel confident about it. It sure darkens things. But I agree. I am not sure how long I would like to leave the etalon exposed. Post Extras:       BYoesle Post Laureate Reged: 06/12/04 Loc: Washington USA Re: My LS60FHa just came in... [Re: Kent10]       #5755905 - 03/25/13 11:02 AM Attachment (8 downloads) Edit   Reply   Quote Quick Reply   Quote: ... would like some kind of protective clear glass in its place...any ideas? matthew Hi Mathew, Good pics, very similar to the original Coronado filter ERF mechanicals (pic below). You should be able to remove the ERF cell (post above) by carefully scraping off the black silicone used to secure the ERF filter cell to the housing. It can then be carefully removed from the cover, and the cover placed back on the filter giving it a bit more protection than shown above. Using the same technique, however, you can remove the ERF retaining ring and have a cell in which to place an optical window once you know the dimensions of the original ERF. It appears the window would be about 65-75 mm in diameter, and likely has a thickness of 3.5 mm (the standard Lunt ERF thickness). I would check about getting a replacement window with Lunt first: http://www.edgespec.com/oem.html Alternatively, you could likely adapt a window like this quite easily within the cover - it looks very good and the price can not be beat: http://www.surplusshed.com/pages/item/l10768.html Be sure to tilt the window a degree or two to avoid ghost reflections... Quote: If you remove internal ERF filter for the double stacked system to increase the brightness please, please, please DO NOT LOOK THROUGH THE EP-END WHILE THE SECOND FILTER IS UNSCREWED OR REMOVED....I know its commonsense but, I sometimes tune the scope first, and then optimize the DS filter. I would not attempt to remove the internal ERF (I don't know where it is, and this component's position and function can change or be multiple - such as being part of the narrow blocking filter construction). The best - and only - ERF to remove is the secondary ERF of the (second) external etalon - period. Edited by BYoesle (03/25/13 12:54 PM) Post Extras:       dscarpa Carpal Tunnel Reged: 03/15/08 Loc: San Diego Ca. Re: My LS60FHa just came in... [Re: prestonrich]       #5756028 - 03/25/13 11:58 AM Edit   Reply   Quote Quick Reply   I was going to get the 60mm etalon for my Lunt 60 but decided against it because 70X and up is used 90% of the time. I also wish Lunt offered a etalon without the BF. David Post Extras:       Kent10 professor emeritus Reged: 05/08/12 Re: My LS60FHa just came in... [Re: dscarpa]       #5757179 - 03/25/13 10:50 PM Edit   Reply   Quote Quick Reply   Matthew: Did you just unscrew/twist the red portion of your double stack? Facing the front was it counter-clockwise or clockwise. I don't see any screws that can be removed so I am thinking just twist. Is that right or am I missing something. Thanks for any help. With the larger diameter of my LS100F it it difficult to get a grip. Post Extras:       mhilscher member Reged: 07/13/11 Loc: Cologne, Germany Re: My LS60FHa just came in... [Re: Kent10]       #5757689 - 03/26/13 08:39 AM Edit   Reply   Quote Quick Reply   Hi Kent, I just untwisted like it was a big jar, it was a little tight, but not too bad, -so counter clockwise. and oddly i have not heard back from an email to Lunt on a replacement glass, but I will use Bob´s helpful tip, ...will resume the project in about two weeks, will keep you informed on how it goes. I also might try to contact TS telescope in germany to see if the have a correct size glass to replace the red filter. I am also of course going to heed the advice and not touch the internal filter, just the secondary. happy easter. cheers, matthew Post Extras:       Kent10 professor emeritus Reged: 05/08/12 Re: My LS60FHa just came in... [Re: mhilscher]       #5757779 - 03/26/13 09:43 AM Edit   Reply   Quote Quick Reply   Thanks very much Matthew. I'll give it another try. I would think the replacement glass needs to be exactly the same size or else it would be difficult to replace. Not sure but I think finding and replacing the glass may not be easy. I still might try viewing without a replacement glass in place. I will be nervous with the exposed etalon but it is similar with my Tec 160 front element exposed, though with the Tec there is the dew shield and it is closed whereas on the Lunt it looks like dust could more easily get inside and underneath the lens. Thanks again, Matthew. Good luck with finding a replacement glass. Post Extras:       BYoesle Post Laureate Reged: 06/12/04 Loc: Washington USA Re: My LS60FHa just came in... [Re: Kent10]       #5757993 - 03/26/13 11:28 AM Attachment (5 downloads) Edit   Reply   Quote Quick Reply   Here’s some solutions for protecting the de-ERF’d double stack etalon - 1. Remove the ERF cell, reinstall the cover. Done. 2. Remove the ERF cell, buy an optical window, have a cell machined for it that will fit the existing cell threads. Install in the filter cover, reinstall the cover. Done. 3. Remove the ERF cell, remove the ERF, have a window made to fit the original ERF cell, reinstall the cell, reinstall the cover. Done... 4. Perhaps the easiest and least expensive window solution is to: Find an acceptable window such as linked to above. Remove the ERF cell and then the ERF from the cell. Reinstall the ERF cell in the cover. Set the cover down “ERF side up.” Get some automotive black RTV silicone, and place six or so large blobs of silicone equidistant around the top of the cell (below - black). Use some temporary shims of different thickness placed between the blobs to place the window down on, thereby giving it a degree or two of tilt. Let the window and silicone assembly sit and dry for 24 hours. Then remove the tilting shims. You can now install a thin cardboard or other material around the outside of the filter cover to act as a dew shield. Cut a sponge foam ring to fit around the window and inside the dew shield to keep dust from getting into the inside of the cover (below - grey). Dress as pretty as you like, reinstall the cover. Done. You can of course use other methods, but this should work and requires no tools or machining, or custom optical work, and will allow the filter to be restored to its original condition for resale if/when needed: Post Extras:       Pages: 1 | 2 | 3 | 4 | (show all)

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