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  1. #1
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    Default TMB planetary eyepiece question....



    I just bought a 7mm TBM eyepiece for my Orion 10" f4.7 scope. When viewing the moon it was hard to center my eye, because of kidney bean and blackout effects. I do not wear glasses. Has anyone had this problem? Pat

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    Strange. Had no problem with 6mm TMB on my 6" F/7.8 SkyWatcher. Try to increase the eye relief - means keep your eye further from the eyepiece.

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    Thanks, Tried this, but then I get blackouts. I have to hold my head steady or the object dissappears. Pat

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    This may be fast telescope's thing. I had similar problem with Astromaster - till thorough collimation alleviated good part of it. Check the scope's collimation - just in case.

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    Quote Originally Posted by pat c View Post

    I just bought a 7mm TBM eyepiece for my Orion 10" f4.7 scope. When viewing the moon it was hard to center my eye, because of kidney bean and blackout effects. I do not wear glasses. Has anyone had this problem?
    I have the TMB 5mm and an Orion 12" f4.9, but do not have the problem you mention. In fact, I find the eyepiece very comfortable to use. I wish we could do a side by side to see how the different scopes compare to attempt to solve the problem.

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    Orion XT12i Intelliscope on a Tom Osypowski Equatorial Platform
    Low profile helical focuser allowing prime focus with a Canon T2i DSLR
    4mm and 5mm 1-1/4" TMB Planetary II, 10mm and 25mm 1-1/4" Plossils, 15mm 1-1/4" Garrett Optical SWA
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    Default RE: TMB II eyepiece

    With eyecap down I get kidney bean effects. When up I get black outs, something like vertigo, when trying to hold my head steady. When viewing the moon.
    I was using a long barlow and 15mm Panoptic. But wanted one short eyepiece. Maybe another eyepiece design would work. Pat

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    First, make sure current EP is OK. Shake it by hand. Any rattle? When you get "kidney bean" rotate the EP slowly. What happens to the "bean"? Does it rotate with EP? If yes to any above - contact seller or manufacturer - the EP is wrong. Also, is it your first short focus EP? If yes - do some training viewing sessions in daylight. These EPs need a bit of skill to look through.

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  12. #8
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    I bought a 6mm TMB for my 10" Dob giving me x 208. I haven't managed to get crisp views. It might be the mag, but when i 2x barlow my 14mm Explore Scientific (which I love), giving me x178 I get fantastic views of Jupiter. I haven't decided if I'm going to sell it yet. I definitely am not happy with it.
    Bart

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    I've already returned this eyepiece. So I cant't shake it or rotate it. I do know when I move my eye/head around the dark kidney bean would follow. Pat

  14. #10
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    Default RE: TMB II eyepiece

    Bert,
    As far as mag. on 10" I can't go above 200x and this is on the moon. At 160x M-15 looks good. This is using my long barlow(which gives me better difinition than a shorty) and Panoptic eyepiece. I'm trying to get away from the lenght sticking outward from the focuser.
    I would guess it could be your sky conditions, as it is here. Pat

 

 
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