60da others

[blink138]

this concludes last nights efforts

15 90sec iso 800 m16
" " " " M17
" " " " M27

pat
dont know what happened to m27 all twisted an all!

[Garbz]

Looking good. The Ha response seems quite reasonable. Do you edit in photoshop? If so there's a free plugin called Ahasta La Vista Green that could clean up your photos quite nicely. http://blog.deepskycolors.com/archivo/2010/04/26/hasta-La-Vista-green.html

[blink138]

thanks chris
i dont have phtoshop and the pics are in jpeg as they would not download in the canon photo professional for some reason
i will have to look into that one
pat

[Terry B]

I think that flat fields are needed here.

[blink138]

thanks terry
how are falts taken? i know they are photos taken with a dusk sky..... but do they need to be taken prime focus or can they be done hand held? what exposures / speed / quantity need to be done?
pat

[doppler]

You will have to google for full detail regarding flats, but basically they have to be taken with the camera left on the ota in the same position as the lights were taken with a white cloth or light source over the objective. Flats help to remove any blemishes in the imaging train such a dust spots and in your case uneven field illumination "vignetting" caused by using a too large sensor for your imaging train. Great effort otherwise and my guess with the m27 pic is that your camera has rotated on one or more subs. You could always crop the pic a bit to reduce the vignetting.

[blink138]

haha how the hell as this come up from 2012?
i have learnt a little bit more over these five years thank goodness
pat

[doppler]

Lol didn't even look at the post date, the newbies seem to bring them up, they start at the first post of the thread.

[blink138]

haha you're the culprit then rick!
actually thanks mate, as these are some of my first pics ever and i should file them away properly somewhere
pat

[doppler]

No it was actually "crawford" the post before my reply that resurrected the thread I just replied lol. But you are right about filing old data properly I have stuff copied everywhere and couldn't find some that I was looking for today.