Thanks David, and Steve.
Quote:
Originally Posted by rustigsmed
Hi Ivan,
your Mercury/Venus results are truly impressive and you know your stuff on planetary filters.
I have been considering getting the clip in filter http://www.astronomik.com/en/photogr...42-filter.html for my canon EOS, I know you run a mono, do you think it would be possible(on a DSLR) to blend a couple of minutes with the filter and a minute or so video without the filter to combine the UV/IR with colour? (i'm assuming the output video would be black and whitish whitish even for a DSLR?)
Or would the colour frames counteract the work done by the UV/IR?
Thanks for your time and sharing your photos.
Cheers,
Rusty |
Hi Russel, thanks for the comment.
I have tried using an IR sensor on a colour CCD, and it actually works reasonably well, as the colour filters on the chip are usually quite transparent to IR. I think the Canon CMOS sensor might not be quite as sensitive as a Sony CCD to long IR, but I expect it would still be reasonable.
You would be aware you need to remove the built-in IR block filter before fitting an IR longpass filter.
Even though the IR pass result will look mostly mono, you still need to de-bayer the frames when stacking, as the RGB pixels have different sensitivity due to the colour filters, and will give a noise pattern if you do not.
Combining an IR layer to RGB images often gives better contrast, so would be worth trying.
Have not tried UV with a colour sensor, I've read it gives poor results as the bayer matrix colour filters block out too much UV.
-Ivan