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Author Topic: IR filters for DSLR astro imaging  (Read 1382 times)

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Offline PaulB

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IR filters for DSLR astro imaging
« on: 06:25:49, 30 November, 2015 »
Just wondering how effective an Infrared filter is for imaging the night sky, and in particular. Nebulosity surrounding Orion and other areas, where there is a lot of nebulosity.

The filter would be used in conjunction, with a telephoto lens.

Any thought's.
Paul.
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Offline Einari

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Re: IR filters for DSLR astro imaging
« Reply #1 on: 06:28:51, 30 November, 2015 »
You mean IR pass filters ?
Made some experiments in M42 and it showed a different view.
But I suspect a ccd camera would be better choice.
Tapio

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Offline chris.bailey

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Re: IR filters for DSLR astro imaging
« Reply #2 on: 09:01:14, 30 November, 2015 »
Sorry but I may be being thick here but don't stock DSLR's already contain an IR filter? The issue is that these broad wavelength filters attenuate Ha wavelengths and hence the main reason for modding DSLR's. Adding an IR filter on a lens might attenuate IR wavelengths even more but unless its broader spectrum than the one on the DSLR chip, I can't see it will make much of a difference. The Orion region is very rich in Ha so why would you want to block it even more than the DSLR is already doing?

Chris
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Offline chris.bailey

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Re: IR filters for DSLR astro imaging
« Reply #3 on: 11:17:51, 30 November, 2015 »
Paul

http://www.astropix.com/HTML/I_ASTROP/DSLR_HA.HTM is perhaps an interesting read.

Chris
LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
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Lunt LS60PTBF1200|DMK41|Quark Chromo
Samyang 135mm f1.8

Offline PaulB

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Re: IR filters for DSLR astro imaging
« Reply #4 on: 17:54:44, 30 November, 2015 »
Thank you chaps,
The type of filter I was thinking off were these.  52mm Infrared Infra-Red Filter 720nm But obviously that is not a good idea.

It was just an idea I  had, running around the old, noddle.
Paul.
"Whirlpool Observatory"
Losmandy G11-Gemini L4.
Celestron C9.25.
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Atik 428EX
Atik EFW 2
QHY5L-II.
Modded Canon 1000D.
IOptron Mini Tower II
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Online g8ina

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Re: IR filters for DSLR astro imaging
« Reply #5 on: 16:14:20, 01 December, 2015 »
The filters in std DSLRs is a hotmirror IR blocking filter, remove this and the camera is what we call "full spectrum". You can then add whatever filter you like. Infrared comes in from 590nm, lots of colour, thru 650, 680, 720nm, where you start to lose colour, then up to 850 and 940nm which is pretty much pure mono.
David Harris
Nikon D7100 Sigma 10-20mm, Nikon 18-70, Tamron 90mm macro
Nikon 55-200 VR, Canon G12 infrared. http://www.flickr.com/photos/g8ina

 

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