What is possible with 30Sec exposures.

[mill]

Just to show what is possible and giving some hope to beginning astro photographers :thumbsup:
This is M42 taken on a crappy night with moisture in the air, as can seen by the nice blue halo around the brightest star right of M42 :mad2:
The advantage for me is that i have a QHY9, but this is also possible with a dslr and some longer exposures.
Here we go: Red=7x30Sec Green=6x30Sec Blue=7x30Sec and Luminance=13x30Seconds

I have only done levels,curves and noise reduction in CS5
The black point is a wee bit cut but i dont care :P

To have a look at how it is done go here and try some of those techniques --->>> http://www.newastro.com/zone/downloads/index.htm

[AdrianF]

Nice would be happy with photos like that.

Adrian

[mswhin63]

Hi Martin, that is brilliant.

I have to agree it is possible to do something in under 30 seconds. I dont mean to hijack a thread but I also managed to same http://www.iceinspace.com.au/forum/attachment_browse.php?a=85246 in 34 10 sec exposures. It really opened up some possibilites want to follow up with other objects.

Although ISO levels are needed to be higher and I also have 12" DOB on an EQ platform. Much more apeture so shorter exposure

Tried to capture more last night but my platform played up.

[rcheshire]

That's stunning Martin. If you were to use a dslr, what exposure times would you recommend?

[mill]

Nah the more you do it, the more critique you have on yourself :)



Looking good Malcolm :thumbsup:
The only problem with a dslr is the noise :(





The exposure time depends on the ISO and what you want to capture.
For M42 you need to experiment with the exposure time to get the trap and not blow it out.
Then you take longer exposures to get the nebulosity and blend the shorter exposures into the longer exposures( this is not always the case ).
So it all depends on what you want to image.

[mswhin63]

I have to agree, it is all about experimenting. If you can only do short exposure then you are generally safe to do M42 without too many blowout issues. What I have learnt is processing is the key, too long exposure causes the core to blowout so you need to combine long and short exposures to get overall detail, which I have still yet to learn and experience.

Have fun, DSLR is a good beginner camera and can provide pleasing photos as you gain experience along with the addiction you can then fork out more money to get clearer pictures.

It is post like Martin's that really help advance your skill as a beginner.

[jjjnettie]

Short exposure astrophotography is a terrific way to learn. Not just about exposure times and iso's, but the processing skills you learn will serve you well.
LOL Not wanting to hijack your thread either, but I used to be the queen of the 20 second sub.
Here's some images I took using a Canon 20d through an ED80 scope. My mount was an alt azi iOptron Minitower.
Total exposure times on these images was 42 minutes, 26 minutes and 17 minutes. That's a hell of a lot of 20sec subs.:lol:

[ballaratdragons]

Very very nice result Martin. :)
The detail is quite stunning actually :thumbsup:

Not wanting to hijack your thread either, either :lol:

These are all 10 second single frame images I got with the Samsung: