Hole Inside Eyepiece Holder of Mark V
Posted 06 April 2013 - 05:01 PM
I have been using my Mark V Binoviewer with my Lunt solar scope. I noticed a glint when using my Leica ASPH Zooms. It is in the right eyepiece only. I looked inside the eyepiece holder with the eyepiece removed and there is a hole on the upper left. This is letting in light. The 1.25" adapter to my Leica is very short and so light is getting inside the lens and reflecting. I'm not sure why that hole is there and I am wondering if someone else could check to see if you have a hole inside the eyepiece holder on the right side only. There is no hole on the left side. Thanks! Kent
Posted 06 April 2013 - 05:09 PM
Posted 06 April 2013 - 05:49 PM
I also am thinking about stuffing something in the hole. I have a Baader Vip Modular Barlow and it has the 1.25" adapter that I linked to above. It is long enough but since I can see through the top easily, I can see light still gets in. It is less light but I wonder if this will solve the problem.
Posted 06 April 2013 - 05:59 PM
Posted 06 April 2013 - 06:07 PM
Posted 06 April 2013 - 07:57 PM
Posted 07 April 2013 - 07:23 AM
With the help of Rex I found a 1.25 extension at Scopestuff. I measured and it will probably be only about 1mm too long and that should work so I ordered it.
I looked at what was available at Scopestuff. I decided to check AgenaAstro as well and found 1.25" extensions in these lengths: 1", .75", .5" and .25" and all are in stock. Page showing all of them is here.
Posted 07 April 2013 - 09:07 AM
BTW did you ever get your 2.6 GPC to work in the proper orientation in your Herschel Wedge? You may recall this thread.
Posted 07 April 2013 - 11:52 AM
BTW did you ever get your 2.6 GPC to work in the proper orientation in your Herschel Wedge? You may recall http://www.cloudynig...5230304/Main....
Yes, I did get it figured out, but wasn't totally happy with the whole way of doing it. Let me explain... As we all know, the 2.6GPC must not be screwed into the MarkV as the 1.25 & 1.7 GPCs are, but, rather, turned around and screwed into the top of the diagonal followed by the quick-change adapter. This won't work for the Herschel Wedge since it doesn't have sufficient clearance due to the position of the ND3 & Solar Continuum filter. I continue to consider disassembling the 2.6 GPC and reversing the lenses so that it would have the same orientation as the 1.25 & 1.7 GPCs as was shown in this thread. Here's why I haven't done this yet - it seems like such a simple thing to do, so why didn't Roland Christen design it that way? One has to wonder. Perhaps the spacing of the lens elements require it to be that increased distance from the prisms. Who knows!? I plan to ask when I see him at NEAF in two weeks. So, where was I? Oh yeah. Trying to fit the 2.6 GPC in the correct/approved orientation with the MarkV & Herschel Wedge given the space restrictions. I called George at Astro-Physics and he said to acquire this SCT Gender Changer from AgenaAstro. Using that new part plus the original SCT male threaded adapter that came with the Herschel Wedge winds up giving the additional 7mm space required to keep the 2.6GPC from hitting the filters. You then need to screw on this part (which I already had), drop the 2.6GPC nose-down into this part and screw on the quick-change female adapter. I discovered right away that you had to place a tight-fitting spacer that comes with the GPCs to use when placing the GPCs in the nose of the diagonal. As you'll recall, the GPCs don't screw into the nose, but rather are placed into the diagonal and held in place by the nose - but require the spacer to keep the GPC centered in the front of the diagonal. Why am I not totally happy with this arrangement? I would much prefer that Baader had provided a screw-in arrangement so that the 2.6GPC could be securely attached without messing with that plastic/fiber spacer to keep it centered. Yeah, I know - I'm picky - but this arrangement just seems a little Micky Mouse given the high quality and versatility of the rest of the gear. OK, let the questions begin...
Posted 07 April 2013 - 12:08 PM
Posted 07 April 2013 - 12:42 PM
Thanks for explaining this, Dave. At least you got it working. The other alternative would be to use shorter focal length EPs in the bino with the 1.7 GPC which also is not recommended but some do it successfully I have heard. I have the same problem with installing the 2.6 GPC in my Lunt LS100 solar refractor. You can't put it in the Lunt diagonal so I have been using it positioned in the same way as the 1.7. I haven't done a critical analysis and I am not that experienced but it worked for high magnification views of prominences. You mention the thread with the disassembled 2.6. Coincidence that I just bought that reversed 2.6 GPC from George. Just this morning! So I wonder the same thing about why they made it that way and if it will be as good but I am going to try it and compare with the one I have. Maybe they made it for the Maxbright. Don't the GPCs work differently in those binos. Not sure. I seem to remember reading that they do and I also thought I remember reading that Baader was considering making a different version of the 2.6. I am not sure in what way. Anyway, all very interesting. Thanks for your explanation.
The GPCs in the Maxbright binoviewers ALL fit the wrong way for us with the MarkVs (see ad here). Apparently, the 1.25 & 1.7 GPCs are assembled with a reversed-lens arrangement for the Maxbrights compared to those for use with our MarkVs. If that's the case, then why, oh why, is the 2.6 assembled the way it is? I really want this question answered!! Is it something that Baader does just to be ornery? or is there a spacing issue as I mentioned before? I sure hope to find out from Roland in 13 days. Congrats on getting that 2.6 from George. I was thinking of contacting him to see if he'd perform the reversal service for me. I'm anxious to hear your opinion of the views. The reason I was so anxious to get the 2.6 GPC to work with the Herschel Wedge was because I often grab an 80mm Apo for a quick solar fix. This scope won't reach focus with the Herschel + MkVs without the 2.6 GPC. The 102mm and 140mm Apos I use normally can be used with no GPC at all, or any of the three, so that's not normally a problem - only with the 80mm for quick views.
Posted 07 April 2013 - 01:34 PM
Posted 07 April 2013 - 01:39 PM
Posted 07 April 2013 - 03:24 PM
I sure hope to find out from Roland in 13 days.
That will be very interesting. I hope he has an explanation.
Posted 09 April 2013 - 06:32 PM
Posted 09 April 2013 - 06:49 PM
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Posted 12 April 2013 - 08:53 AM
Posted 12 April 2013 - 10:19 AM