Hyperion 17mm e/p quizzle ?

[astroeddie]

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

[John]

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.

[GazOC]

Might be a daft question Eddie but are you using it as an 1.25" or 2" eyepiece? If its as a 2" then you could get the extra distance by moving it to 1.25".

[astroeddie]

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

[Ags]

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.

[Ags]

If you want to use it as a 2" ep, buy a fine tuning ring to extend the length.

[John]

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 !.

[astroeddie]

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