Shooting stars at higher ISO and quicker shutter speeds vs lower ISO and longer shutter speeds?

12 years 6 months ago #158048 by Photo Mojo
I'm hopping to get some star shots and star trails in this weekend, but have some thoughts. So if I use higher ISO, my shutter will obviously open and close quicker getting what light it needs from the stars quickly. Am I thinking right to believe this will give less noise from ambient light pollution? Because if I shoot with lower ISO and longer exposure time, I'm giving the camera more time to soak in that unwanted light in earths stratosphere?

I'm learning as I go here, so your thoughts would be appreciated.

Kevin


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12 years 6 months ago #158051 by TheNissanMan
From what I have read but am yet to try...

- A tripod is essential with ermote release
- As low an ISO as possible
- As long an exposure as possible
- Stay away from the city/towns to reduce ambient light

It's something I must try when we get a clear sky next...


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12 years 6 months ago #158067 by Photo Mojo
Thanks Nissanman. I can't avoid the city lights and have tried longer exposures and got a bone whitish film in the photos.

I'm wondering if I'm going to have to get to city limits in order to get a good shot. Will a telescope get around the light in the atmosphere?


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12 years 6 months ago #158069 by chasrich
I think the only difference might be in the length of the star trails. I think it would be an interesting experiment to try. Longer exposures might increase the likely hood that a star will pass through the frame but that difference would be slight. Faster shutter speeds would likely let any shooting stars appear brighter - a two second shooting star will make more of an impression on a twenty second exposure than it will on a 120 second exposure. I'm seeing more a lot of pros and cons either way. Make sure you wear a white lab coat while you experiment - it makes it more scientific... :rofl:

“Amateurs worry about equipment, professionals worry about money, masters worry about light, I just make pictures… ” ~ Vernon Trent
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12 years 6 months ago #158071 by chasrich

Photo Mojo wrote: Thanks Nissanman. I can't avoid the city lights and have tried longer exposures and got a bone whitish film in the photos.

I'm wondering if I'm going to have to get to city limits in order to get a good shot. Will a telescope get around the light in the atmosphere?


The city light is reflected light from the city off of the atmosphere and clouds. Clear skies are your best bet anyway.

“Amateurs worry about equipment, professionals worry about money, masters worry about light, I just make pictures… ” ~ Vernon Trent
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12 years 6 months ago - 12 years 6 months ago #158087 by Baydream
And tonight and tomorrow
October 21, 22 - Orionids Meteor Shower. The Orionids is an average shower producing about 20 meteors per hour at their peak. This shower usually peaks on the 21st, but it is highly irregular. A good show could be experienced on any morning from October 20 - 24, and some meteors may be seen any time from October 17 - 25. The nearly last quarter moon may hide some of the faintest meteors this year. Best viewing will be to the east after midnight. Be sure to find a dark location far from city lights.

This from www.seasky.org/astronomy/astronomy-calendar-2011.html

and with moon rise not until 1:20 and 2:20 on these days, that should help.
These shots were from Aug 2010 (Aug 2011 had a full moon that lit up the sky.)
The first is the orig and picked up some ambient light (from a very dark area). By converting to B&W and increasing contrast, the edited photo looked better.
Canon XSI, 50mm 1.8 at f/1,8, ISO 1600 and 20 sec exposure.





Hoping the one in November finds good weather this year.

Shoot, learn and share. It will make you a better photographer.
fineartamerica.com/profiles/john-g-schickler.html?tab=artwork

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12 years 6 months ago #158097 by chasrich
I got the car packed and my sweetie to come along. I'll post anything that turns out tomorrow... If you want me I'll be checking the skies from 11PM until the moon rises. :woohoo:

“Amateurs worry about equipment, professionals worry about money, masters worry about light, I just make pictures… ” ~ Vernon Trent
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12 years 6 months ago #158179 by Foggy
Santa you can drop that 10" or 11" Meade or Celestron down my chimney any time you need to. No need to wait till Christmas :whistle:


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12 years 6 months ago #158264 by Joves

Photo Mojo wrote: I'm wondering if I'm going to have to get to city limits in order to get a good shot. Will a telescope get around the light in the atmosphere?


No a telescope actually suffers more from light pollution, your average telescope has a Focal Length from 600mm to 2000mms which magnifies the light and also any turbulence in the air. You can tell how stable the air is by looking at the stars, if they are twinkling the air mass unstable or mixed with warm and cold air converging, if they are steady then the air is stable and better for seeing.
Now on your initial question. The difference is ISOs will not matter except the higher ISO will actually capture the pollution faster, either way to get trails you need long exposure times. So the lower ISOs are what you want for longer exposure times and longer trails. What your maximum time for having the shutter open can be determined by the maximum length of video your camera can shoot, if you expose longer than that then you will can potentially over heat your sensor.


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12 years 6 months ago #158902 by Tam
I don't think it's possible to shoot stars at a higher ISO and quicker shutter speeds. I don't think anything will be capture, because the camera isn't open long enough.


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