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Placing 2" Filter into SCT Optical Path

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#1 deansjc

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Posted 08 November 2018 - 11:26 PM

Originally posted 03 November 2018 - 08:44 PM in NexStar Forum, which may not have been the most appropriate place:

 

...so, I am posting here in hopes of some input from others.  With thanks.

 

Here's my question: what have you used and what would you recommend to place a 2" filter into the optical path of an Celestron 8SE for astrophotography?  Solutions that I have seen seem to involve a SCT visual back adapter into which a second component (that accepts 2" filters) is inserted, which in turn accepts a T-Adapter.  Obviously, there is a fair bit more involved here than for visual observing where a 2" diagonal is normally threaded for a 2" filter.

 

'Regards, John.



#2 einarin

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Posted 09 November 2018 - 02:49 AM

I just use 2" filter with 2" nosepiece (which has threads).



#3 jgraham

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Posted 09 November 2018 - 10:25 AM

+1

That is what I use; a 2" filter threaded onto the end of my camera's 2" nosepiece.

#4 deansjc

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Posted 09 November 2018 - 11:00 AM

Thank you very much for your suggestion....however I must be either "missing something" or just have the "wrong" parts in my kit that you are using since I am fine to do AP with no filter.  I am using a Nikon D5300 with Celestron's T-Adaptor-SC #93633-A mated to Celestron's Nikon T ring #93402.  With these components, there is no nose piece per se, rather a direct threaded connection tube for the visual back threads.

 

Would I be right in my thinking that you have different components in play, one of which is threaded for a 2" filter?  I would appreciate a photo of your arrangement or a link to same, as I suspect it is the better option to pursue.

 

Still, if there is an add-on to my kit pieces that would accommodate a filter, I'd be happy to hear what that might be.

 

'Cheers.



#5 einarin

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Posted 09 November 2018 - 11:18 AM

Maybe this thread will help:

https://www.cloudyni...ters-with-dslr/



#6 jgraham

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Posted 09 November 2018 - 11:55 AM

My DSLR has a camera to t-thread adapter with a 2" nosepiece screwed onto the t-thread. This slips into a short 2" visual back on my scope. I have seen direct connects but I have never used one. Some have internal threads to accept a filter, others use chip-in filters that mount inside the camera body. Lots of options.


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