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How to insert a filter into an M42 imaging train?

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#1 Tulloch

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Posted 13 April 2021 - 06:39 AM

Hi there, I have an SCT that I'd like to use with my f/6.3 focal reducer connected to a variable T-adapter for SCT to my camera which has an M42 thread. The bit that I don't understand is that everything is running M42, how do I insert a filter into this imaging train if they are threaded M48?

 

I've seen a "ZWO 2" Filter drawer" for sale, but this seems to have M48 on one end and M42 on the other? If I used this, would I need an M48 to M42 adapter? Or is there something else that would work better?

 

Thanks, Andrew



#2 Dynan

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Posted 13 April 2021 - 08:02 AM

The ZWO filter drawer comes with an M42 to M48 adapter ring. It should be all you need to run M42 or M48 on either/both sides of the filter drawer.

 

See the diagram:

https://astronomy-im...lter-drawer-m42


Edited by Dynan, 13 April 2021 - 08:03 AM.

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#3 Tulloch

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Posted 13 April 2021 - 08:09 AM

Aah, I think I get it. So that adapter can on either end to give you M48-M48, or M42-M42.

Thanks.

#4 Dynan

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Posted 13 April 2021 - 08:25 AM

Yep. I use one and had no trouble adapting to either my focuser or OAG, both include an M48, down to ASI533 (et al.) M42 camera front ring. You might order an extra M48 to M42 ring adapter if you have a special case.

 

https://astronomy-im...m48-m42-adapter

 

(A pic, diagram, or thorough list of your equipment would help here.)

 

EDIT: Make sure you get 2" (M48) filters. You can't adapt the filter inside the drawer with the above ring. It doesn't fit. I tried.


Edited by Dynan, 13 April 2021 - 08:27 AM.

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#5 Midnight Dan

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Posted 13 April 2021 - 09:24 AM

I use a Teleskop Service filter drawer.  It has M42 on front and rear, while the filter slide can be purchased for a 2" filter (M48) or 1.25" filter.

 

-Dan

 

Filter Drawer: https://optcorp.com/...-filter-changer

2" Filter Slide: https://optcorp.com/...2-filter-drawer


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#6 Tulloch

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Posted 13 April 2021 - 05:34 PM

Yep. I use one and had no trouble adapting to either my focuser or OAG, both include an M48, down to ASI533 (et al.) M42 camera front ring. You might order an extra M48 to M42 ring adapter if you have a special case.

 

https://astronomy-im...m48-m42-adapter

 

(A pic, diagram, or thorough list of your equipment would help here.)

 

EDIT: Make sure you get 2" (M48) filters. You can't adapt the filter inside the drawer with the above ring. It doesn't fit. I tried.

Thanks for that - my equipment isn't that complicated right now, just a variable SCT to T-adapter, where the T-adapter is all M42 threads, then an ASI224MC camera with M42 thread. I guess the filter drawer just goes between the M42 threads?

 

Andrew

Attached Thumbnails

  • Variable t-adapter.PNG
  • SCT to M42 camera.jpg


#7 Midnight Dan

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Posted 13 April 2021 - 05:40 PM

Thanks for that - my equipment isn't that complicated right now, just a variable SCT to T-adapter, where the T-adapter is all M42 threads, then an ASI224MC camera with M42 thread. I guess the filter drawer just goes between the M42 threads?

 

Andrew

Yep.  That's correct.  Not sure how long the ZWO drawer is, but the Teleskop Service is 18mm.  So if you remove that 15mm extension tube and replace it with the drawer, you'll be 3mm longer than you are now.  If that causes a problem, you might have to get some different extension tubes to compensate.

 

-Dan


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#8 Tulloch

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Posted 13 April 2021 - 05:42 PM

Thanks guys, appreciate the assistance flowerred.gif .


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#9 Dynan

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Posted 13 April 2021 - 06:16 PM

The 'Dual Dan's' say waytogo.gif

 

And let us know how it turns out! CS!


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