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AR window vs UV/IR cut window?

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#1 TheHarvester

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Posted 25 May 2022 - 11:06 PM

I have a ZWO ASI071MC Pro camera that came with an anti refection window over the chip. I read it's a good idea to use a UV/IR cut filter with the color cameras. I have and run a 2 inch UV/IR cut filter on front of my flattener but was wondering if there were any benefits or drawbacks to replacing the AR window in the camera with a UV/IR cut window and not using the screw on filter.

The only benefits I can see is there would be one less piece of glass for the light to go through. And I wouldn't have to stack filters if I wanted to use another filter, like my light pollution filter.

Would the UV/IR cut filter also provide some anti reflective properties or would, replacing the window possibly cause other issues?

I'll probably be replacing the desiccant tablets soon so if I do replace the window it would be at the same time so opening the camera wouldn't be an issue for me.

#2 unimatrix0

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Posted 25 May 2022 - 11:33 PM

Someone asked QHY about their decisions on why some cameras have AR and others UV/IR blocking. The answer was, that some sensors just don't work well with the UV/IR glass so close to it. They recommended placing any filters, including UV/IR at least "filter wheel distance". 

 Some other smaller cameras are purposely done with AR only for planetary imaging. 

I think it's the same reason why ZWO also do a mix, can't think of other reasons, beside cost savings.  

Also on aliexpress some of the RisingCam vendors lets you pick and choose if you want AR or UV/IRblocking front glass before purchasing. 


Edited by unimatrix0, 25 May 2022 - 11:34 PM.

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#3 t-ara-fan

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Posted 25 May 2022 - 11:50 PM

I have a ZWO ASI071MC Pro camera that came with an anti refection window over the chip.

So do I.  I use an IDAS HEUIB-II filter  as my IR/UV cut filter.  I don't have LP so I have never felt the urge to stack filters. But I know many LP filters also cut UV and IR.  Which filter do you use for LP?
 


Edited by t-ara-fan, 25 May 2022 - 11:51 PM.


#4 TheHarvester

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Posted 26 May 2022 - 12:05 AM

I assumed, some sensors were more sensitive to uv and/or IR and thought that was the reason for the different filters on the different cameras. I didn't know about distance from sensor possibly making a difference. 



#5 TheHarvester

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Posted 26 May 2022 - 12:18 AM

So do I.  I use an IDAS HEUIB-II filter  as my IR/UV cut filter.  I don't have LP so I have never felt the urge to stack filters. But I know many LP filters also cut UV and IR.  Which filter do you use for LP?
 

Lucky you for the lack of light pollution.

I don't really do much imaging from home but do something testing and figured if I could get something from here with the use of a LP filter, why not. I have an Astromilk CLS filter. 

Another thing is, I use 3 different telescope and all 3 use different flatteners  so I need to swap the filter each time I change telescopes. No matter how careful I try to be, I get a smudge on the filter. My other option for that problem is to buy 2 more UV/IR filters.




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