2 inch back

[Willarnold]

Hi all,

I'm getting a bit stumped. I've just ordered a SCT focal reducer from Starizona for my C11.

On their documentation they recommend that I change out the standard 2 inch connection as it's not a pure 2 inch hole.

http://starizona.com/acb/instructions/SCT%20Corrector%20Instructions.pdf

I'm struggling to find anything.

Can anyone recommend any options?

Would I need to just install an additional focuser? (not the best as I've already have a feather touch)

All ideas welcome

Many thanks

[Carbon]

Either the Baader Clicklock or Astro Physics visual back will give you the full 2" opening you need with this system.

[Dunkster]

Try one of these: http://www.365astron...pes-p-1910.html

By the looks of it, the corrector doesn't look threaded and would be inserted in the clamp in the same way a diagonal normally would.

The SCT thread on the C11 and C14 is 3.25", an adapter like the above drops this down to a full 2" like Carbon says - unlike the piece Celestron shipped with mine, which only has an aperture of 38mm, so I expect this would restrict light/FOV when imaging (or using EP with a wider field stop). The smaller SCTs have a 2" thread instead.

[Willarnold]

Thanks. The Astro Physics visual back looks like what I'm looking for. Would it be secure enough to hold everything in place?

I.e. reducer, connector and the camera?

[Willarnold]

Ok, the Baader version looks Very secure!

So this screws into the 3.25 back of my SCT?

[Dunkster]

Sure does! Very solid connection. I don't have any experience of the AP but it's also highly regarded.

Not sure whether or not this would be redundant if you ended up with a Crayford/Steeltrack, as the vb itself is not inexpensive, but worth looking into.

[m.tweedy]

get one of these that screws into the back of the OTA. The focal reducer fits inside it!

http://www.firstlightoptics.com/moonlite-focusers/moonlite-cs-dual-rate-sct-crayford-focuser-for-large-325-inch-thread.html

[Willarnold]

Excellent, thanks all. I'm going to go for the Baader Clicklock. It looks like it's just what I'm after, and nice and secure.

Thanks Michael, as I've already got a feather touch focuse on my scope, I was trying to avoid buying another focuser.

Kind regards

[Carbon]

I don't think the Starizona FR the OP ordered fits into the Moonlight focuser.

[m.tweedy]

if it is this one

http://starizona.com/acb/ReducerCorrector-f63-P743C805.aspx

then it screws inside the moonlite crayford without any issues.

As it happens the OP is going with a Baader clicklock back.

The reason I went for the moonlite is that despite having a feathertouch microfocuser on mine I still got some image shift when using the feathertouch alone. I normally get rough focus and fine tune with the crayford as there is no mirror movement with that.

[m.tweedy]

I don't think the Starizona FR the OP ordered fits into the Moonlight focuser.

Looking at the link it is not the one I thought and you are correct it will not fit in the moonlite

[Brian Nordstrom]

Try one of these: http://www.365astron...pes-p-1910.html

By the looks of it, the corrector doesn't look threaded and would be inserted in the clamp in the same way a diagonal normally would.

The SCT thread on the C11 and C14 is 3.25", an adapter like the above drops this down to a full 2" like Carbon says - unlike the piece Celestron shipped with mine, which only has an aperture of 38mm, so I expect this would restrict light/FOV when imaging (or using EP with a wider field stop). The smaller SCTs have a 2" thread instead.

Nice bit of kit , but who in there right mind would carry a C14 like THAT !~!! , OUCH ! .

I know its only advertising , good at that , but whew ! its hard to look at ?

Brian.

Try one of these: http://www.365astron...pes-p-1910.html

By the looks of it, the corrector doesn't look threaded and would be inserted in the clamp in the same way a diagonal normally would.

The SCT thread on the C11 and C14 is 3.25", an adapter like the above drops this down to a full 2" like Carbon says - unlike the piece Celestron shipped with mine, which only has an aperture of 38mm, so I expect this would restrict light/FOV when imaging (or using EP with a wider field stop). The smaller SCTs have a 2" thread instead.