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Inserting Filter in Image Train

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#1 mikenaka

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Posted 28 July 2021 - 06:16 PM

After searching for 30 minutes, I could not find exactly where a filter (like an L-Extreme, L-Enhance etc) needs to go. Does it screw into the reducer? T Adapter?

 

Setup is Celestron Reducer, T-Adapter, OAG, 21mm Spacer then camera. As you can probably tell, I'm new to all of this. I have been successful in getting images, but still have a lot to learn.  It's frustrating sometimes, but I'm hoping it all comes together soon.  Appreciate any info you can give me.  Thanks.

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#2 BrettD

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Posted 28 July 2021 - 06:44 PM

I would think the easiest would be to use a zwo filter draw instead of the 21mm spacer:

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

 

assuming you have a 2" filter


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#3 BrettD

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Posted 28 July 2021 - 06:58 PM

Even if your reducer has a  place to insert a filter (some do), you really wouldn't want to do that especially with an l-enhance or l-extreme, as it will take most of the light away from your guide camera.

When using an OAG the filter is much better between the OAG and camera 


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#4 mikenaka

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Posted 28 July 2021 - 07:06 PM

Thanks!  Didn't even know something like that was available. I don't have any filters yet.  Wanted to figure this out before I made any purchases.



#5 arbit

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Posted 28 July 2021 - 10:03 PM

As BrettD says, when using an OAG the filter should be between the OAG and camera.The ZWO filter drawer is 21mm and fits nicely.

It takes only 2 inch filters though. If you prefer 1.25 inch for whatever reason (cost, camera), they also sell an adaptor which allows use of 1.25 filters. Be sure to get the new design with the holder ring.

If in a hurry, you can also use the 1.25 nosepiece that came with the camera and attach the filter to the end of that. But that needs a 1.25 inch filter only.

Overall the filter drawer approach is better as it is more flexible in filter size and you can change filters without removing the camera.


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Edited by arbit, 28 July 2021 - 10:08 PM.


#6 mayhem13

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Posted 28 July 2021 - 11:41 PM

Even if your reducer has a  place to insert a filter (some do), you really wouldn't want to do that especially with an l-enhance or l-extreme, as it will take most of the light away from your guide camera.

When using an OAG the filter is much better between the OAG and camera 

........and I would have thought an IR pass filter would improve guiding?




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