Mars, Jan 3rd

[brianb]

I've taken advantage of extensive cloud cover to reprocess a set of AVIs I took a few days back.

Top row: LRGB composite; simulation (Starry Night Pro)

Bottom row: infra red, red, green & blue images.

Infra red, best 500 out of 3000, using Astronomik Planet Pro 742 filter

Colours: best 500 out of 2000, using Astronomik type 2c coliur seperation filter set

Composite: RGB with IR used as luminance channel

CPC1100, 2x barlow, DMK21 camera. 2010 Jan 03, 0309 UT. Seeing mediocre, sharp but rather wobbly.

[RobH]

Very nice and detailed image Brian.

Does the 742 filter make a big difference compared to a standard IR filter with planets in your opinion?

Cheers

Rob

[brianb]

Does the 742 filter make a big difference compared to a standard IR filter with planets in your opinion?

What's a "standard" IR filter?

The Planet Pro 742 is an infra red pass filter with a cutoff at 742 nm ... the opposite of the usual infra-red blocker. The idea is that the seeing is steadier at long wavelengths. If you're using a mono camera that has reasonable IR sensitivity, it is a good way to make luminance images ... or just use it on its own on the moon, which is pretty colourless so you're not losing anything by recording only one pass band with a mono camera. Hope that answers the question.

[RobH]

Thanks for the explanation Brian.

Planetary imaging is not something I've done, but plan to do so in the medium term hopefully.

Cheers

Rob

[arad85]

Nice capture....

[beamish]

Superb Brian, very impressed !!

[geoff_k]

That is a very nice set of images.

Geoff