SCT Adapter for SW Mak 180 Pro

[alaskacam]

I recently bought a SCT adapter for the back of my Sky-watcher 180 Mak Pro. The ring was not near big enough on the OD. This ring has a OD of ~ 2.1" and the back of the telescope has a back over 2.5", so the adapter just falls through the retaining rig that screws on the back of the scope. All others I find online seem the same size. Any suggestions on where I can go to cross from the back of my Mak to a SCT thread??

Thanks,

Rob

[AWR]

My 127 Mak has a M45 rear thread, which fits the Mak - SC adapters (I got mine from TS). I guess the 180 Mak has a larger rear thread!

You could try TS (Teleskop Service), they seem to supply a bewildering number of adapters. I'm not sure what postage to Australia would be like though.

Andrew

[johninderby]

There's this post on SGL where someone was selling a 180 with an SCT -Mak adaptor and the adaptor seemed to fit onto the OTA OK.

http://stargazerslounge.com/completed/86116-skywatcher-skymax-180-pro.html

John

[A McEwan]

That's wierd! My blue tube 127 and gold tube 180 both have the same thread on the rear port- 36.4mm (male). I know there were some changes to the Skymax range when they brought out the new colour scheme - maybe this is something to do with it?

[GazOC]

That's wierd! My blue tube 127 and gold tube 180 both have the same thread on the rear port- 36.4mm (male).

Mine too.

[johninderby]

The adaptor you're using does look like this doesn't it?

John

[AWR]

That's wierd! My blue tube 127 and gold tube 180 both have the same thread on the rear port- 36.4mm (male). I know there were some changes to the Skymax range when they brought out the new colour scheme - maybe this is something to do with it?

Weird indeed!

My 127 Mak (blue tube) has a 45mm male thread on the back of the OTA. I use one of these to attach a 2" diagonal.

As supplied, the OTA had an adapter attached with a 42mm male thread on the outside (T2?) and two female threads on the inside ~36mm and ~32mm. The supplied 1.25" diagonal fitted into the smaller female thread (fitted and held with thumb screws - not screwed).

Andrew

[A McEwan]

Sorry, should have been more clear. The scope comes with a "visual back" already fitted, which has two thumb screws that hold a diagonal in position. It is basically a short tube that sticks out the back. This visual back attaches to the rear port of the telescope by means of a retaining ring, which screws onto the male 36.4mm thread that makes the rear port.

I was assuming that we had rhetorically removed the visual back adapter by unscrewing the retaining ring!

Full details and illustarion of this can be found here: Fine focuser for 4" Mak

Ant

[AWR]

Yes, that's it - the visual back.

But when it's removed, it is a 45mm male thread on the OTA (onto which the knurled ring screws). The 36.4mm thread would be a female thread on the inside of the retaining ring of the visual back (the small ring with the two holes).

Andrew

[AWR]

I've included a picture of the back of my scope. There is a M45 - SCT ring (which is too tight for me to remove).

[A McEwan]

Yep, that's right. I was going a bit too fast for myself!