IR passband comparison image

Hi,

I did a quick comparison shot of the Rheita valley a few nights back during fairly poor seeing. I shot one video with a Schular 850nm passband filter and then quickly took it out and shot another one without. here is the comparison, the image on the right (the really crappy one)was shot without, I had trouble even getting a proper alignment because the frames were so distorted, the one on the left was with the filter and its not half bad. I'm pretty sold on IR passband filters, the only drawback is they eat up a lot of light, at least the Schular one does, I ordered the Baader 670 a while back I'll let you know which one seems better!

cheers

Mike Wirths

Attached Image:

Mike, I'll take it you tried to Re-Focus your scope before taking the one on the right?
As much as I like the comparison, the one on the right is waaaaay too fuzzy compared to the one on the left... and I don't see how the IR passband filter would improve the image so much compared to the other one... I mean, like night & day, literally!

Illuminate me, please! 8)

Hmm...I guess if you look REALLY hard you can see a difference .

That is truly dramatic Mike, thanks for showing it. I'm still waiting my Baader 610 bypass filter.

Paul

Mike Wirths said:

Hi,

I did a quick comparison shot of the Rheita valley a few nights back during fairly poor seeing. I shot one video with a Schular 850nm passband filter and then quickly took it out and shot another one without. here is the comparison, the image on the right (the really crappy one)was shot without, I had trouble even getting a proper alignment because the frames were so distorted, the one on the left was with the filter and its not half bad. I'm pretty sold on IR passband filters, the only drawback is they eat up a lot of light, at least the Schular one does, I ordered the Baader 670 a while back I'll let you know which one seems better!

cheers

Mike Wirths

Wow Mik4e what a Huge difference! Thanks for posting. I use one as a matter of habit because I sarted imaging when Mars was around and never took the filter off!!

Jim Phillips

Hi Mike,

That is a big improvement ,how do the raw frames compare.
This has got me enthused about trying out my new IR pass filter
when the clouds clear.

Thanks,

Wes Higgins