Straight through numbers?

[Okeydokey]

I think I may have asked this question in a different guise before but...  Re: my Helios as detailed in signature below, if I wanted to put a 2 inch eye piece on to it without a diagonal will it be the right way up on both axis.

And I'm guessing here, but will I need somekind of  extender tube to get into focus, if so any ideas how long to compensate for the diagonal,  I would be looking for a zoom focus eye piece at the same time, btw.

Many thanks

Edit: had a few posting problems of my own making here   my bad!

The resulting image is right side up, but will be reversed from left to right - See more at: http://www.f1telescopes.co.uk/shop/celestron-optical-accessories/celestron-diagonal-star-1-25-inch/?gclid=CM6FqrHplroCFajKtAodAicADA#sthash.rcgVwDSS.dpuf

The resulting image is right side up, but will be reversed from left to right - See more at: http://www.f1telescopes.co.uk/shop/celestron-optical-accessories/celestron-diagonal-star-1-25-inch/?gclid=CM6FqrHplroCFajKtAodAicADA#sthash.rcgVwDSS.dpuf

[ronin]

if I wanted to put a 2 inch eye piece on to it without a diagonal will it be the right way up on both axis.

I think it will be both upside down and left to right inverted.

The extender needed will have to match the path length inside the diagonal, probably around 2".

[John]

The light path through a 2" diagonal is quite long. The brands vary a bit but it's around 100mm.

ronin is right that, with no diagonal, the refractor will give an inverted image with right and left reversed.

[Okeydokey]

Thats a shame, I have enough problems dealing with my finderscope doing the same, not sure I could manage the upside down, left instead of right bit with my main.  Thanks for your help though, saved me alot of agony

[John]

I think it might have been agony of another kind to use the 120mm F/8.3 refractor straight through unless you have a very tall mount for it !

You can get a finder that shows an upright a properly corrected image though, if thats any help. 

[RichieP]

My Helios Evostar 102 has enough focus travel to allow it to be used with or without a diagonal. Perhaps yours does too?

Sent from my GT-I9305 using Tapatalk now Free