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Simple DSLR IR question

astrophotography
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5 replies to this topic

#1 baja4bob

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Posted 28 January 2020 - 08:33 PM

Hi All,

 

I'm new here and I'm about to get into astrophotography.

 

My question is if someone has removed the IR cut filter from a camera, couldn't an external IR filter be used on the camera for regular photography when not being used for astrophotography?

 

-Thanks,

BajaBob



#2 Jim Davis

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Posted 28 January 2020 - 08:34 PM

Yes. You can get ones that clip in certain camera bodies, or you can buy ones that screw on the end of the lens.


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#3 mmalik

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Posted 28 January 2020 - 09:00 PM

AP is not about IR; it is about h-alpha which is visible red light. Read about mod types here.... Regards


Edited by mmalik, 28 January 2020 - 09:01 PM.


#4 Igor.1812

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Posted 28 January 2020 - 09:50 PM

On sensor IR cut filter (the one we remove to make camera sensitive to hydrogen alpha emission) is not an ordinary IR filter. It is the special filter designed for DSLR sensors that cut not only invisible IR light but a certain portion of far red light as well. Replacing it with conventional IR filter will not restore original white balance. 

 

Igor



#5 sharkmelley

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Posted 29 January 2020 - 12:53 AM

My question is if someone has removed the IR cut filter from a camera, couldn't an external IR filter be used on the camera for regular photography when not being used for astrophotography?

Yes, the Astronomik OWB (original white balance) filter or something similar does exactly that. 

 

But regular photography may need accurate autofocus (depending on how you use your camera)  and unless the total optical thickness of glass is restored then autofocus will be slightly incorrect.

 

Mark



#6 baja4bob

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Posted 29 January 2020 - 01:20 PM

Thanks for all the great info!




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