T-rings

p1taylor · #1 03-03-2010, 07:14 AM

Hi All. I have a Meade 6.3 focal reducer and sx h9c imager what distance do I need between them, is it T2 rings I need, O/D of thread is 41.7mm on a 30mm long one i have, all help appreciated.

peter

[1ponders] (Paul) · #2 03-03-2010, 07:31 AM

From memory the required distance from last element of FR to chip is about 105 mm. What scope are you using it in?

p1taylor · #3 03-03-2010, 07:37 AM

Hi Paul. RCX400 10", so I will need 75mm, 2 x 30mm and 1 x 15mm, are the rings I need called T2, peter

[1ponders] (Paul) · #4 03-03-2010, 07:46 AM

If you were using a DSLR then all you would need would be a T adapter, but using the SX you will be a bit short so you will need to work out an extension tube to go on it. If you use one of these https://www.bintelshop.com.au/Product.aspx?ID=7182 the silver barrel can be unscrewed and the FR screwed in there and then you just need a single extension tube to cover the distance. A couple of options anyway

[1ponders] (Paul) · #5 03-03-2010, 07:48 AM

Steve has a range of adapters that may suit. http://www.myastroshop.com.au/products/cam-adapt.asp

Give him a call

p1taylor · #6 03-03-2010, 08:39 AM

HI Paul. A bit confused here my 41.7mm is not 42mm or do they just call it 42mm, because fin pitch of 0.5mm? thread it will nearly fall out of 42mm. peter