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F-reducer, filter, asi224mc cool and extender tubes question

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#1 gatehealing

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Posted 13 June 2021 - 03:04 PM

I have a lot of light pollution (Austin, tx) and want to experiment with taking some planet pix with these items, but am having trouble figuring out where to fit the filter. Here's what I have:

Celestron nexstar 8se

Optolong OL-LPRO-2 (it has 10202900311 written on the outside of the ring)

Hirsch f/6.3 sct reducer/corrector

asi224 mc cooled

the Male-Female ring that goes on the camera then allows the 21mm extender tube to attach

21mm extender tube

16.5 extender tube

The very small ring that goes on the end of the T adapter (so the T adapter can screw into the female end of the 16.5mm tube that screws into the 21mm tube that screws into the adapter ring on the camera)

Celestron T-Adapter sc 93633-A

(**I also have a Celestron Visual Back 1.25: 93653-A that is on my diagonal but I can put in the above train)

 

Where do I put this filter??

 

Thanks!

Jon


Edited by gatehealing, 13 June 2021 - 03:54 PM.


#2 gatehealing

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Posted 15 June 2021 - 11:59 PM

I found one other post on this subject with no responses. Should I interpret this as nobody knows? Any suggestions even? I cannot seem to find a configuration that works. Is there an adapter that I may not know the term to search?

 

Thx,

Jon



#3 t-ara-fan

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Posted 16 June 2021 - 12:26 AM

I wouldn't bother with a light pollution filter for SLAP* work. 

 

I have found an IR pass filter works well for the moon - if I am shooting mono anyway.

 

 

 

 

 

 

 

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#4 Tapio

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Posted 16 June 2021 - 12:43 AM

For planets you don't need the focal reducer - barlow more likely.


Edited by Tapio, 16 June 2021 - 12:44 AM.


#5 gatehealing

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Posted 16 June 2021 - 12:46 AM

For planets you don't need the focal reducer - barlow more likely.

Yeah, I think the reducer does the opposite of Barlow, at least in some respect…cannot remember what I saw on that, but I remember thinking it sounded like using both would cancel em out somehow.


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#6 gatehealing

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Posted 16 June 2021 - 12:47 AM

I wouldn't bother with a light pollution filter for SLAP* work.

I have found an IR pass filter works well for the moon - if I am shooting mono anyway.
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Let’s say I get the IR pass filter of same style, 2” round with threads. Where would I put it?

J


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#7 Tapio

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Posted 16 June 2021 - 12:59 AM

Filter can be screwed to camera nosepiece. Then you put this in focuser - or visual back.

Haven't use any extensions when doing planetary imaging.



#8 gatehealing

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Posted 16 June 2021 - 01:29 AM

Filter can be screwed to camera nosepiece. Then you put this in focuser - or visual back.
Haven't use any extensions when doing planetary imaging.

I’ll get some pix on here tomorrow. The filter doesn’t seem to fit with or without any tubes/spacers. The filter glass is larger than the opening of the sct (without the reducer)

#9 Tapio

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Posted 16 June 2021 - 06:51 AM

There are two types of filters (and nosepieces) - 2" and 1.25".

You have to have either size and then same size focuser (or visual back) in SC scope end.



#10 gatehealing

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Posted 19 June 2021 - 11:22 AM

There are two types of filters (and nosepieces) - 2" and 1.25".
You have to have either size and then same size focuser (or visual back) in SC scope end.


Ok, I’m 1/2 way there now…apparently in all my efforts I never tried screwing the filter into the 16.5mm extender tube. That works….and the extender tube screws onto the camera. Problem remaining is I cannot find anything to fit the other side of the filter: The T adapter that is on the scope is too small, the super thin adapter that I use on the T adapter to attach the 21mm ext tube is barely too small, the 21mm ext tube male side is clearly too small, and the other side just sits directly on yo of the filter—it’s exactly the same diameter as the filter, so neither the filter nor the tube screws into the other.

Is there an adapter that I’m missing? This filter would be fine on a DSLR camera lens where it’s designed to fit on the outside, but this thing is supposed to fit between the scope and the camera.


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#11 gatehealing

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Posted 19 June 2021 - 08:55 PM

Oops. Posted a comment in wrong thread. Can’t delete in Tapatalk.

Edited by gatehealing, 19 June 2021 - 08:56 PM.



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