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Hyperion 17mm e/p quizzle ?


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Guys,

Took my new Hyp 17mm e/p to my brothers to see what it can do with his "new" 200mm F/6 dob.

Well, it couldnot reach focus. Had to draw the eye piece out a touch by hand to focus ??

Any ideas ?

Cheers .... Eddie

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Has your brother's scope been modified in any way, eg: had the primary mirror moved up the tube a bit to enable another device, like a dlsr, to focus ?. Or perhaps it has a low profile focuser fitted ?.

In a standard Skywatcher 8" F/6 dobsonian I don't think there should be any problems bringing the 17mm Hyperion to focus.

Edited by John
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Ah,

Never thought of adding the 1.25" adaptor for extra focal plain.

Scope has not been modded in any way as far as I can tell.

I'll have to wait until my scope arrives next weekend, and if none focusing in the 300P then I'll contact FLO.

Cheers for the speedy reply guys.

Eddie

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The 17mm is really a 1.25" ep. The removeable element is a smythe lens, which is a combined field corrector and barlow. Obviously with the smythe removed you get a longer focal length but you also lose the field correction.

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Ah,

Never thought of adding the 1.25" adaptor for extra focal plain.

As the others have said, there is your answer plus the eyepiece won't be a 17mm without the lower lens set - which is in the 1.25" barrel assembly !.

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Cheers all,

Yes I realised the lens element in the 1.25" nose piece.

But I thought it was a 2" eye piece, so I removed the element and tried it in the 2" adaptor. It was millimetres away from focus.

Thanks for clearing the quibble up. Now I know :)

Eddie

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