120, 240 or 480 seconds. What is better ?

[cometcatcher (Kevin)]

4 hour of 3324 should be interesting!

[jsmoraes (Jorge)]

I did 4 hours and 24 minutes. 66 x 240 seconds ISO 800. I am not glad with the result, because I did a comparison with another photo of 2013 with only 40 minutes, and I see that my seeing here is very worse after this two years.
The large photo of 2013 can be seen at: http://www.astrobin.com/41885/
The atual large photo at http://www.astrobin.com/186662/

Despite of 4 hours the nebula was very faint. To enhance it I will need to do some hours with UHC filter.

To get what you can see I needed to strech very much the signal. Since the files are larger than 200 Kb I can not publish here. Please take a look at http://jsmastronomy.30143.n7.nabble....ula-td431.html, also.

[jsmoraes (Jorge)]

Ok, it was done. Total of 7 hours and 16 minutes, with 27 x 480 sec ISO 800 UHC filter.
The files are very large because of amount of data in the image. Please take a look:
large scale: http://www.astrobin.com/187281/
normal : http://jsmastronomy.30143.n7.nabble....d431.html#a432

[cometcatcher (Kevin)]

Very nice Jorge. The UHC filter helped bring out much more Ha nebula. What type of UHC filter was it?

[chuckywiz (Ben)]

Hi Jorge,

Love the photo, ive tried this target and is not even in the same ballpark. as im still very very early learning on processing, any chance you could post a pic of what 1 x 480 sec shot looks like with no processing. Id be interested to see how that look so i can see if im on the right track with longer exposures etc.

Ben

[jsmoraes (Jorge)]

Kevin it is a Halfa + OIII filter from Teleskop germany shop

could post a pic of what 1 x 480 sec shot looks like with no processing

It is difficult with no processing, because it will debayered. If I do a copy screen from ZoomBrowser-Canon and a conversion to JPG by Photoshop-CamaraRAW with all sliders in zero, the photos will be different because of different algorithm to debayering.

I am posting conversion JPG from Photoshop. Wide view and a crop with full resolution of camera.
As the 480 seconds was with UHC filter I am posting the 240 seconds skyglow filter also.

Skyglow, UHC and Crop