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From downtown of a million city: M42 with just DSLR

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elgol20

elgol20

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Hi,

the weather has been so bad and I took advantage of 2 hours clear sky to contribute to a school project to show what is (also) possible to do in astronomy from within a big city; so I was quite amazed what came out from 90 min total exposure with a Esprite Apo 80/400mm and no further filters used. With naked eye I barley see 100 stars if at all...

Nikon D810A, 120 *15s, 60*30 sec and 30*60"



dee50e707c1a47a0b94f641d05bb9b24.jpg

Noise and color are more tricky but so what, 2 hours on balcony is better than driving 1 hour where it is dark and having clouds again:-)

--
_____
Stefan
 
Always interesting to see what can be done with modern gear - and yes, taking advantage of clear weather close to home can be very rewarding. A lot can be done despite not having optimum conditions. Wil never win the big prize, but that is not always the goal...

The colors are a bit untraditional and the center of the nebula could well be a bit brighter (after all it is the brightest part of the nebula). But still a good catch despite difficult conditions - great!
 
Trollmannx said:
Always interesting to see what can be done with modern gear - and yes, taking advantage of clear weather close to home can be very rewarding. A lot can be done despite not having optimum conditions. Wil never win the big prize, but that is not always the goal...

The colors are a bit untraditional and the center of the nebula could well be a bit brighter (after all it is the brightest part of the nebula). But still a good catch despite difficult conditions - great!
Click to expand...
it is a composite of 15sec and stack of all. so center stars come visible. saw a pic of a 1 mp cmos camera with 2 sec exposure taken more than 1800 times and wow it was good. some 300 bucks planet cam but nice trapez and dust. really amazing these days
--
___
Stefan
 
Trollmannx said:
The colors are a bit untraditional and the center of the nebula could well be a bit brighter (after all it is the brightest part of the nebula). But still a good catch despite difficult conditions - great!
Click to expand...
actually I quite like the Hubble picture of Orion even though I know the Hubble pallet ain't natural color.

take a look at Cmos 2 seconds per frame

for me truly amazing with a camera like that

when the weather stays like that I should stay on that balcony and do monochrome cmos short exposure with hubble pallet :-D
 
elgol20 said:
it is a composite of 15sec and stack of all. so center stars come visible. saw a pic of a 1 mp cmos camera with 2 sec exposure taken more than 1800 times and wow it was good. some 300 bucks planet cam but nice trapez and dust. really amazing these days
--
___
Stefan
Click to expand...
Stefan,

Did you stack all the exposures together or did you do 3 stacks for the respective exposures, and then stack the 3 resulting TIFs or merge them in PS?
 
Dogglet said:
elgol20 said:
it is a composite of 15sec and stack of all. so center stars come visible. saw a pic of a 1 mp cmos camera with 2 sec exposure taken more than 1800 times and wow it was good. some 300 bucks planet cam but nice trapez and dust. really amazing these days
--
___
Stefan
Click to expand...
Stefan,

Did you stack all the exposures together or did you do 3 stacks for the respective exposures, and then stack the 3 resulting TIFs or merge them in PS?
Click to expand...
both :). all stacked plus inside region superimposed with stacked 15sec exposures via PS
--
___
Stefan
 
elgol20 said:
Dogglet said:
elgol20 said:
it is a composite of 15sec and stack of all. so center stars come visible. saw a pic of a 1 mp cmos camera with 2 sec exposure taken more than 1800 times and wow it was good. some 300 bucks planet cam but nice trapez and dust. really amazing these days
--
___
Stefan
Click to expand...
Stefan,

Did you stack all the exposures together or did you do 3 stacks for the respective exposures, and then stack the 3 resulting TIFs or merge them in PS?
Click to expand...
both :). all stacked plus inside region superimposed with stacked 15sec exposures via PS
--
___
Stefan
Click to expand...
I'm kinda lazy, so was the one that was stacked all at 1 go look anything as good as this?

Roger
 
Dogglet said:
elgol20 said:
Dogglet said:
elgol20 said:
it is a composite of 15sec and stack of all. so center stars come visible. saw a pic of a 1 mp cmos camera with 2 sec exposure taken more than 1800 times and wow it was good. some 300 bucks planet cam but nice trapez and dust. really amazing these days
--
___
Stefan
Click to expand...
Stefan,

Did you stack all the exposures together or did you do 3 stacks for the respective exposures, and then stack the 3 resulting TIFs or merge them in PS?
Click to expand...
both :). all stacked plus inside region superimposed with stacked 15sec exposures via PS
--
___
Stefan
Click to expand...
I'm kinda lazy, so was the one that was stacked all at 1 go look anything as good as this?

Roger
Click to expand...
Just the inside area was blown even with 32bit Tiffs, since M42 has great contrast I think using just one exposure will not render what I like. For me I want to see the trapezium, was a problem too due to bad seeing
 
elgol20 said:
Just the inside area was blown even with 32bit Tiffs, since M42 has great contrast I think using just one exposure will not render what I like. For me I want to see the trapezium, was a problem too due to bad seeing
Click to expand...
 
elgol20 said:
Dogglet said:
elgol20 said:
Just the inside area was blown even with 32bit Tiffs, since M42 has great contrast I think using just one exposure will not render what I like. For me I want to see the trapezium, was a problem too due to bad seeing

--
___
Stefan
Click to expand...
Ah no, I meant with the 3 sets of light frames you took with different exposures, could you have achieved this final result by just stacking the whole lot together and then post-processed? Or is it a must to stack separately and then merge manually for best results?

Roger
Click to expand...
like I said, yes except for the brightest region. I stacked them all together and processeed them. correction only for inside... wait have pics somewhere
--
___
Stefan
Click to expand...


4b6a001764ce4b4c99cb0fc35090b581.jpg.png

this is what the first stack looked like without any pp



00ba178635904a65825900e2c34f2852.jpg.png

first stack after some post to my taste in APP



dbd9accf76f9433eb13ff11998ebe135.jpg

some further adjustments to my liking that evening (I usually prefer natural color as well)

first stack only



b1ae477a957c4509b5b33c7e01517093.jpg

second stack of 15sec only

--
_____
Stefan
 
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