L IR GB imaging

[MrEd]

HI All

My main imaging skills are in Lunar and planetary work.

I have now advanced to tri colour/line imaging for certain targets.

I already use a 670 nm IR pass filter for L data but i am looking to go into the deep red wavelength.

My query is this,

Can i replace my red filter for an IR filter 742nm or 807nm?

Will this give me a red image data on all targets or is it best for

the moon and mars only?

Thanks in advance

Ed Sampson

[Kaptain Klevtsov]

I've got no idea Ed., but it sounds interesting. I don't get quite what you mean though, as you say you use an IR for the Lum. layer already. Are you suggesting a more severe (if that's the correct term) IR filter so you end up with IR, IR++, G and B in place of LRGB, or have I misread the post? I'd think the IR++ might be better as a Lum. filter and the "normal" IR instead of the red might be more suitable for normal looking images, but I don't know what you're trying to acheive.

Kaptain Klevtsov

[MrEd]

OK to clear up my original post.

(this is for advanced planetary imaging)

Using 680nm IR pass for luminance helps with atmosphere distortion.

A more severe filter in the IR (742 or 847nm) produces a very red/Sharper image.

Now will this shift into the infra red be an ideal replacement for a normal Red

filter or does it only improve the moon and mars as targets?

(or does it all make no sense!!!!)

Regards

Ed

[Nick Smith]

Hi Ed

I've got the 802 lp filter and it really steadies the image down in marginal seeing. I've used it on Venus and also the Jupiter shots I posted on here in the planetary section. The trouble is it blocks out a lot of light. With the C11, I could not even use a 2x barlow on Jupiter and even on the Moon it gets a bit dim with anything other than prime focus stuff. Couldn't use it all on Saturn. I'm hoping it will be okay on Mars, but at f30 or f40 I expect things will be getting a bit dim.

With your scope, you'd probably be better off with the 742nm filter, though having said that the mono Toucam should be more sensitive than the camera I have been using (a Lumenera Infinity 2-1M). Also, I haven't got any data on the IR transmission of the xlt coatings on the C11 as this could obviously have a bearing on the issue.

Hope this helps

Regards

Nick

[MrEd]

Hi Nick

Many Thanks,I know what ypu mean

i have imaged in the UV 350nm and i can barley see

a thing.

I think i will go for 742 nm and use it for 'special targets'

regards

Ed

[bern]

The 742 is the most useful IR pass filter Ed, you can see a comparison between IR pass filters on my feedback page:

http://www.modernastronomy.com/feedback.html (scroll down)

Like KK says, it's most often used as an L filter

bern

[barkis]

Bern, on that link you provided, I was astounded by the Venus images by Rick Schrantz.

It is rare to see such Cloud detail via a ground based telescope.

Super.

Ron.

[bern]

Bern, on that link you provided, I was astounded by the Venus images by Rick Schrantz.

It is rare to see such Cloud detail via a ground based telescope.

Super.

Ron.

Pretty sweet considering the images were taken with his Toucam Pro II that we modified to Mono + Raw output.

bern

[MrEd]

Thanks for heads up bern.

I know what to go with now.

Regards

Ed

[peonic]

Sorry to drag this thread off topic for a second, but as RAW modded ToUcams were mentioned - does flashing a Toucam's EEPROM to enable RAW mode effect it's capabilities as a guide cam in any way?

Cheers,

Chris

[bern]

Sorry to drag this thread off topic for a second, but as RAW modded ToUcams were mentioned - does flashing a Toucam's EEPROM to enable RAW mode effect it's capabilities as a guide cam in any way?

Cheers,

Chris

All the Mono webcams we do are RAW flashed and the LX modded versions are used for guiding. I doubt if the RAW flash itself has any major impact on guiding efficiency but it can't hurt and is reversible anyway.

bern

[peonic]

Cheers Bern - I've got one of Andy Ellis' moded SPC900C's and I was quite keen to flash it to RAW - just didn't want to scupper it's main job of being my guidecam.

Chris

[bern]

Andy may have raw flashed it already, might be worth checking with him.

bern