Careful!
It is not a standard SCT thread on the back of the SE4.
I have all of the attachments you mention (except that my adapter was for a Pentax).
I will check.
Follow up
The T Adapter I have is a genuine Celestron Part #93635. Andrew have it
Quote:
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T-adaptor (#93635-A). Suits C90, C130 and NexStar 4SE models $39.00
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http://www.andrewscom.com.au/site-section-10.htm
(But I think I got mine from eBay).
Just checked and its $77 on eBay.
BTW Welcome Bejay to IceInSpace
And you don't need a visual back (for the above) as the 93635-A screws directly onto the rear thread of the 4SE (I just tested it).
If you want to use the rear for visual as well ( as indicated by you mentioning the star diagonal), then YES you will. Again I got the Celestron one for this model.
But this is extremely optional, as the 4SE has a built in flip mirror and second viewing outlet on top. Having said that, I did exactly the same.
Just a Point (I didn't know when I started). With the camera mounted on the rear of the 4SE you may not be able to move the OTA through the full range of motion. This may be a problem for you.