[WITHDRAWN] Canon EOS Ha Filter

[Hans Tucker (Hans)]

Astronomik H-Alpha 6nm CCD Filter for your Canon EOS camera that clips in above the mirror.

NIB, the seal hasn't been broken.

$250 + Postage

[g__day (Matthew)]

Hans,

Is this filter useful for unmodified Canon cameras - that still have the factory standard IR filter - the one that cuts out most of the Hydrogen alpha light?

Can you describe what is does for unmodified Canon cameras and how well it does it? For instance if I shoot the Tarantula today with my Canon 400D - the result is mostly blue / green from the Oxygen - I lose nearly all the red due to the Canon's native IR filter. Could this filter help me at all - or does it only help at the margins by reducing skyglow (something that my Hutech IDAS filter already does reasonablly well).

Also does installing the filter preserve colour fidelity on all other wavelengths? So it passes light above its cut off without shifting the colour balances around!

Most interested in your reply!

Matt

[Hans Tucker (Hans)]

Hi Matt,

Unfortunately I have no experience with this Filter because my EOS camera was stolen before I could get to use the filter..hence why it is NIB with the seal intact.

From the Astronomik website:

Question:
When I use the Clip-Filter Systems do I still have to make other modifications to my Canon EOS digital camera for astro-imaging? Specifically, removing the camera’s OEM IR-blocking filter over the sensor?

Answer:
The Astronomik Clip-Filter System does not have anything directly to do with a digital camera’s “IR-band blocking filter”.
Regular photographic digital camera sensors have a very small sensitivity in the H-alpha line portion of the spectrum which is bad for regular photographs but very important for astro-imaging. Hence, Canon sells it’s cameras with an internal “IR-blocking filter” over the sensor to remove the over abundance of ‘red’ due to Infrared from ordinary photos.
For astro-imaging, sensitivity in the red (the H-alpha line) is desired and is achieved by the removal of the camera’s internal IR blocking filter.
The Clip-Filter System has no idea if Canon’s IR-blocking filter is installed or whether it has been removed. The Clip-Filter System can be used with both converted and with un-converted cameras with equal results..

Your best bet would be to pose your questions to the more experienced DSLR users on the Imaging forum.