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  1. #1
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    Default Chance to buy 3mm 2" EP



    I ran into an opportunity to purchase a 2" wide view 3mm eyepiece that can also be used in the 1.25" format. Apparently it was a prototype and a short look on the net didn't yield much info about 2" 3mm EPs. Typical of 2" anything its big and I almost bought it for no other reason than it was "different". I chose to buy a used 7mm-21mm zoom instead. After thinking about it and because its only $45, I think I might as well pick it up on price alone. My Orion/Vixen is currently a 1.25" set up, but I have plans of upgrading the focuser to 2". Doing that should take advantage of the 2" EP mode which is supposed to be wide view.

    Besides all of the above, the thought crossed my mind is a 3mm EP a dust collector on a 102mm telescope? The two variables is the fact its a wide view 2", whether that might bring it into better favor I have no clue. I'm new at this and from a practical experience I have used a 2x barlow on a 9mm EP looking at Orion and the view was just in focus, but on the dim side. I figured I was using a net 4.5 EP with that set up and I've heard of using high power EPs on planetary targets so the 3mm might be useful with my f/10 fr and 1000 fl telescope. I haven't figured out eye relief yet, I figured what the hell do i have to loose but $45? I'm sure I would have to do some re-balancing once installed, the thing is a grenade.
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  2. #2
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    Default

    My personal opinion? Too much power for all but the best scopes on absolutely awesome nights. Complete dust collector. Heck, on my 110mm f7 I have been able to use a 5mm but that was really really pushing it. I think there are better uses for $45.

    Allan

  3. The Following User Says Thank You to Flea77 For This Useful Post:

    Joe Lalumia (01-12-2012)

  4. #3
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    Default

    yup.....just a night of a lifetime.....good luck
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  5. #4
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    Default

    My 2 cents:
    I have a Stratus 8mm (that came free with something else I bought).
    I never use it. Not because it's not a decent EP, but because it weighs a ton.
    I don't feel like re-balancing my entire setup just for one EP.

    I believe weight differential between EPs is often overlooked.

    I just upgraded and bought 3 new EPs (2 Explore Scientific, and a TeleVue Panoptic). After price and quality, my most important criteria was actually weight.

    You didn't tell us what brand this EP was.
    If it's superior grade, then go for the bargain. For $45 you'll have quality glass that might come in handy if you buy that great big honking 14" Dob down the road. Otherwise, I think it really is too much EP for a 4" refractor (even on a CG5 that can probably take it without too much re-balancing).

    By the way, that Orion VX102 looks like a really nice telescope.
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  6. #5
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    Default

    I doubt your scope can use a 2 inch focuser with any practical ep. It certainly can't benefit from 2 inch at 3 mm. That's why it's being sold cheap.

  7. #6
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    Default

    Thanks all for putting this in perspective. All of you had worthwhile points regarding mag power and the weight factor being another. I wanted to wait for the feedback before making a decision and the only factor left hanging is the quality of the EP. At this time all I know it was a prototype sent to a telescope manufacturer. What I will do is try and find out who was the EP manufacturer and what quality level it is. I don't think its a top level EP and the size and weight alone are good enough reasons to pass on it. Your right Voyager, on a 14" DOB it would be a good fit, on mine people might think the front is where you look into the scope. There is no question I would have to rebalance the scope each time I put it on, or, I can do curls with it.

    Appreciate the feedback. If a 3mm EP was practical in some circumstances I would be better off finding a decent used plossl.
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  8. #7
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    Default

    Quote Originally Posted by Flea77 View Post
    My personal opinion? Too much power for all but the best scopes on absolutely awesome nights. Complete dust collector. Heck, on my 110mm f7 I have been able to use a 5mm but that was really really pushing it. I think there are better uses for $45.

    Allan
    I agree with Allan. -Greg
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