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Post by jimcurry on Jan 12, 2014 9:49:49 GMT -5
I think Mikey, perhaps others, have experience with filter wheels on their refractors. Anything to recommend in terms of make or issues? I assume more backfocus for one. Do I need to make an adaptor to use one?
I use a TEC turret and don't want to surrender use of that if possible. It has a 2" snout.
THanks.
Jim
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Post by mikey cee on Jan 12, 2014 11:24:23 GMT -5
Jim all the older models such as my Orion 5 position wheel use only the 1-1/4" nose piece. It's total extra back focus is only 15mm.  Mike |
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Post by boomboom on Feb 25, 2014 16:53:01 GMT -5
Just like Mike I have the 1.25" 5 position wheel, mine from Agena Astro. Nice wheel moves easily. The only issue I have is a bit of extra reflection on the WO Minus V filter. Nothing too annoying. Doesn't happen with the other colours, possibly they cover it up?
Matt
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Post by mikey cee on Feb 25, 2014 22:38:27 GMT -5
For you newcomers this is what is being referred to.  Mike  |
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Post by jimcurry on Feb 26, 2014 7:03:59 GMT -5
A picture is worth a thousand words. Thanks, Mikey!
Jim
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Post by boomboom on Mar 2, 2014 0:56:07 GMT -5
Mikey's pictures are indeed worth a thousand words! Please allow me to add a couple of hundred words of my own....my filter wheel and bino set up.  Matt |
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Post by astromanuk on Mar 2, 2014 5:22:50 GMT -5
Matt,
Is that a pair of 28 RKE's in your binoviewer? I was trying out my RKE 28's for the first time in a binoviewer last night and love them. I was looking at the supernova 2014J in M82 and loved the floating in the air in front of you effect they give. Back to the topic in hand, do you find that the spacing between the glass path corrector and filter leads to a restriction of the field? Having spent time swopping filters in and out of my binoviewer last night this looks like a great solution to my problem. In your wheel what is the distance between the end of the glass path corrector and the filter?
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Post by mikey cee on Mar 2, 2014 11:42:54 GMT -5
Anytime you increase the power you just know the FOV will get smaller. That is the question is it not? I keep my OCA always in the nose piece of the 2" diagonal. My lowest power is around 410x...highest is about 815x. I'm so accustomed to this FOV and power range that it is just normal for me. I'm just tickled pink that I love lunar, planetary and tight double stars......especially with that nice dark background thanks in part to the R30-35 lens. Mike |
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Post by boomboom on Mar 2, 2014 21:07:45 GMT -5
G'day Ian, In the photo and my standard way I use Bino's the OCS is in the bino's at the top of the diagonal….just enough room to reach focus, which is the joy of DIY scopes  Hacksaw's are a great tool! Yep RKE 28's..love em. One does have to stand back a long way so I like a towel over my head to keep out the stray light, and mozzies or cold air depending on the time of year. I also can put the OCS at the other end of the diagonal or remove it and get reasonably semi-wide views. The diagonal is a Long Pern prism which is ok but does show a spike through Jupiter. Might go with a mirror, as my 2" mirror doesn't show this at all. Filter wheels are the only way to go for filters, that or slides. I gave up on screwing filters on and off eyepieces a while ago….no fun at all  Like Mike I'm into Planets, Lunar and doubles for bino's and when I've had enough of that, motors off, clutches unlocked in goes the 40mm 68º eyepiece and cruise the night sky… Matt |
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Post by astromanuk on Mar 3, 2014 8:36:26 GMT -5
Thank's Matt and Mikey on the clarification. I have started to hunt around and explore the options. I think the convenience of filter wheels on a cold and damp night justifies the outlay.
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Post by boomboom on Mar 5, 2014 22:23:57 GMT -5
Ian,
Missed a part of your question. The RKE 28's vignette on the WO Bino's. Nothing too bad but if you like a sharp field stop it doesn't happen with the WO's at this FL of eyepiece. As for the wheel being worth the outlay...yes it is. I never bothered with them before except the FK or other types of minus V filters but now it is nice to swap around between yellow green and blue.
Bino's with a larger clear aperture might not vignette but I have no idea there really....there all a bit to expensive for me!
Matt
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Post by astromanuk on Mar 7, 2014 6:43:32 GMT -5
Matt,
I was thinking more of the filter distance from the OCS causing a restricted light cone, but on reflection don't think it will be so much of a problem as most filter wheels now are of a slim design for imaging. For information the RKE 28's show a sharp field stop in my TV binoviewer. I was talking with Al Nagler at Astrofest and it was only then that I realised I have had my binoviewer nearly 20 years! I had an old 1920's Zeiss unit before that (the TV performed better with modern wide field eyepieces) and now I would never be without one. Judging by your experience and that of Mike the same will be true of a filter wheel.
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Mike
Mike
Hacksaw's are a great tool!