an experiment in narrow band imaging with an unmodded canon 300D

[seeker372011 (Narayan)]

As one of the last three people in the world still imaging with an unmodded canon 300D , I wanted to experiment with an OIII filter (instead of a H alpha filter) to see if one could still enter the realm of narrow band imaging with an un modded Canon

Would appreciate any comments on this first foray.

The target was the lagoon nebula , and this represents 50 minutes of exposure-five 10 minute subs, stacked and processed in IRIS. Scope was ED 80 (autoguided), camera the Canon 300d, Astronomik OIII filter. Imaged last Saturday, but I only got around to processing tonight.

as an independent exercise I will see what happens when I add this data to RGB images -also with an un- modded Canon-from last year..when I get around to it

[EzyStyles (Eric)]

very nice seeker! shouldn't it be blue if image through an O-III filter?

[Lester]

Very nice shot, nebula almost jumps off the screen at ya.

[seeker372011 (Narayan)]

Originally Posted by EzyStyles

very nice seeker! shouldn't it be blue if image through an O-III filter?

yes it is blue..there is virtually no data in red channel. I simply converted to grey scale

[tornado33]

Howdy
Great image there. With my O3 filter I find as yours, no data in red channel, plenty in green and some in blue, so in IRIS I went into colour balance, reduced the red levels to zero, reduced the green by 50% then turned the result into grayscale, that way theres a little less noise as all the red channel had was noise so may as well get rid of it.
My camera is modded but that makes no difference to O3 imaging, only H a imaging. Your camera will do just as well in O3.
Scott

[seeker372011 (Narayan)]

Originally Posted by tornado33

so in IRIS I went into colour balance, reduced the red levels to zero, reduced the green by 50% then turned the result into grayscale, that way theres a little less noise as all the red channel had was noise so may as well get rid of it.
.
Scott

thanks for the tip..I ws really struggling with noise and this may be the solution..while I was at it I had a go at the swan as well in OIII-at full res it looked half ok but aagain noise was the problem so I will go back and reprocess as you suggest.

[seeker372011 (Narayan)]

well here is the Lagoon reprocessed as suggested by Scott..much better looking histogram

[Striker (Tony)]

Nice results.

I tried a SII image the other day and was not impressed...I believe I will fail in my experiment trying mapped colour images.

Keep these coming...their something about Ha/OIII images that appeal to me.

[RB (Andrew)]

Very nice indeed Naryan.

[tornado33]

Glad I could assist.
Striker, what colour did the SII image look to be, and what was the problem, a very low signal?
Scott