Free Shipping on ALL Products
camera reviewsbest cameraslens reviewsphotography tipscamera forumvideo toursphotography bookssupport me
It is currently Fri Apr 18, 2014 11:15 am

All times are UTC




Post new topic Reply to topic  [ 12 posts ] 
Author Message
 Post subject: I'm seeing stars :-)
PostPosted: Fri Feb 29, 2008 7:01 am 
Offline
User avatar

Joined: Mon Dec 03, 2007 4:14 am
Posts: 421
Location: Idaho (US)
well, it was another clear night so I thought I would try again at shooting the stars, and this it what I came up with.

Image
18mm f5.0 shutter speed 35min
I wanted to get the light trails :shock:

Image
18mm f5.0 shutter 61 sec
The long orange line was a shooting star :shock:
Image
18mm f5.0 shutter 69sec
It looks as tho anything longer then 60 sec you will start to see the light trails :idea:

I like #1 because it looks cool, but #2 I think is the best of the three.
What do you guy's think?

Nick.

_________________
Canon Rebel XTI, Tamron 70-300mm w/180-300 macro AF, Canon 18-55mm,Canon 50mm F1.8, Sandisk ExtremeIII 2gig.
Nikon N2020.My Flickr


Top
 Profile  
 
 Post subject:
PostPosted: Fri Feb 29, 2008 8:34 am 
Offline
Site Admin
User avatar

Joined: Tue Nov 08, 2005 3:32 pm
Posts: 9952
Location: Queenstown, New Zealand
Hi Nick, great work!

If you're anything like me when I started astrophotography, you'll soon know the exact time at which the stars will begin trailing at any focal length! If you zoom into 100%, I'm betting there's a bit of trailing at 60 seconds even zoomed out to 18mm (27mm equiv), but you might get away with 50 secs... depends how much you want those stars to look like perfect dots!

Also remember the further the stars are from the pole, the more they'll trail. In fact, try a really long exposure with the pole in the middle, maybe zoomed-in to accentuate the effect and see what happens!

PS - how come you closed the aperture to f5 on the 60 second exposures? Was the sky too bright otherwise?

And what ISO were you using?


Top
 Profile  
 
 Post subject:
PostPosted: Fri Feb 29, 2008 8:54 am 
Offline
User avatar

Joined: Mon Dec 03, 2007 4:14 am
Posts: 421
Location: Idaho (US)
#1 and #2 are ISO 100 #3 1600. I was just out side the city and there was still some "city light" in the backround.
I was just south of the city looking south west I think. so that would have put the pole just about above town. . . right?? I don't know very much about star maps. just a few names and about where they are. no more then that realy.
Still playing with the settings taking notes as I go. I had a small amount of time (only about 1hr. takes me 15-20 min to get there) before I had to pick up my brothers from the movies, so I only got 4 shots off. If I had more time I would have stayed longer.

It might be clear fri & sat so I will go out again.
I have got the canon 50mm 1.8 on order now. should have it next tue or wend. :lol:

How far would one have to be to be far enough away from the city lights?
I was about 2.5-3 miles away the way the bird fly's.

Nick

Nick

_________________
Canon Rebel XTI, Tamron 70-300mm w/180-300 macro AF, Canon 18-55mm,Canon 50mm F1.8, Sandisk ExtremeIII 2gig.
Nikon N2020.My Flickr


Top
 Profile  
 
 Post subject:
PostPosted: Fri Feb 29, 2008 9:26 am 
Offline

Joined: Wed Jan 16, 2008 12:24 pm
Posts: 646
Location: Stockholm, Sweden
#2 is just specially nice as you got the shooting star.

Looks really great :)

_________________
Canon EOS 40D - Canon EF-S 17-85mm f/4-5.6 IS USM - Canon EF 50/1,8 II - Canon EF 70-200/4L IS USM - Speedlite 430 EX - Lowerpro Nova 4 AW
My Flickr


Top
 Profile  
 
 Post subject:
PostPosted: Fri Feb 29, 2008 10:36 am 
Offline

Joined: Mon Sep 17, 2007 9:17 am
Posts: 3662
Nice shots!

_________________
Graham
Flickr


Top
 Profile  
 
 Post subject:
PostPosted: Fri Feb 29, 2008 11:05 am 
Offline
Moderator
User avatar

Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9784
Location: UK
Hi Nick,

Nice shots and thanks for posting. A lot better than my own effort when I first pointed a 400D/XTi at the stars. You will see a big difference with the f/1.8 lens.

Scattered light from street lights is the bane of most of us. However it is quite acceptable if some creeps into your shots as it can subsequently be removed by post-processing. I use IRIS, which is free. It's a very powerful program but has a slightly quirky and unfinished user interface. Fortunately there is an active user community out there who share tips. The web site also has links to some tutorials as well as an online help system.

Removing a constant sky background is pretty straightforward (can be done with a lot of image processing software) but IRIS makes it possible to go the next step and remove a gradient background (quite common near the horizon). Removing a sky gradient is described here.

Clear skies. 8)

Bob.

_________________
OM-D E-M1 + ED 12-40mm f/2.8, H-F007014E, M.ZUIKO DIGITAL 45mm 1:1.8, M.ZUIKO DIGITAL ED 75mm 1:1.8, L-RS014150E.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


Top
 Profile  
 
 Post subject:
PostPosted: Fri Feb 29, 2008 5:40 pm 
Offline
User avatar

Joined: Tue Feb 19, 2008 9:30 am
Posts: 2370
Location: Malmö, Sweden
Great shots love teh shooting staro on the second image!

I was wondering did you combinw two images to with 30sec to make it 61 or can u choose teh option on your camera for sucha long exposure time?

_________________
My Picasa

My Flickr


Top
 Profile  
 
 Post subject:
PostPosted: Fri Feb 29, 2008 8:13 pm 
Offline
User avatar

Joined: Mon Dec 03, 2007 4:14 am
Posts: 421
Location: Idaho (US)
alex168 wrote:
I was wondering did you combinw two images to with 30sec to make it 61 or can u choose teh option on your camera for sucha long exposure time?


No, I bought a shutter release for the camera. It was $30 I think, and I had the camera set into "Bulb".

Thanks Bob for the link. I will take a look at it. I have PS CS3. It can all so be done there. . . . right??

I am still playing with it and don't realy know how to use it.

Nick

_________________
Canon Rebel XTI, Tamron 70-300mm w/180-300 macro AF, Canon 18-55mm,Canon 50mm F1.8, Sandisk ExtremeIII 2gig.
Nikon N2020.My Flickr


Top
 Profile  
 
 Post subject:
PostPosted: Fri Feb 29, 2008 9:09 pm 
Offline
Moderator
User avatar

Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9784
Location: UK
Nick12984 wrote:
Thanks Bob for the link. I will take a look at it. I have PS CS3. It can all so be done there. . . . right??...

Yes, you can do a huge amount with Photoshop. Gradient removal is probably a lot easier with IRS though. So easy that I haven't even tried it in Photoshop. IRIS is by no means the only game in town. I've never used it but MaximDL is another one to look at and isn't too expensive if you are going to use it regularly.

Bob.

_________________
OM-D E-M1 + ED 12-40mm f/2.8, H-F007014E, M.ZUIKO DIGITAL 45mm 1:1.8, M.ZUIKO DIGITAL ED 75mm 1:1.8, L-RS014150E.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


Top
 Profile  
 
 Post subject: How to focus?
PostPosted: Thu Aug 14, 2008 7:26 pm 
Offline

Joined: Thu Aug 14, 2008 3:35 pm
Posts: 2
Location: Northern Bay Area, Ca. USA
I've been trying to shoot the night sky but can't quite get the focus right. Many say just to use manual focus and set it all the way out. I do this and the stars in the image are blurry. Not streaking across the sky as they would with too long of an exposure. No, these are definitely out of focus. Auto focus won't lock on the night sky with my Canon XSI. So how do I go about getting the proper focus?
Thanks,
Chris


Top
 Profile  
 
 Post subject:
PostPosted: Thu Aug 14, 2008 7:37 pm 
Offline
User avatar

Joined: Sun May 25, 2008 12:48 pm
Posts: 7997
Location: UK
The end position is usually beyond infinity, which is pretty far away! It is put there to allow for variations. Infinity is just a little before then.

Best way would be to manually focus by eye and leave it.

If there is something else bright and far away (moon, far buildings etc), you could try focusing on that with AF then switch to MF, making sure not to disturb the focus in the process.

_________________
Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.


Top
 Profile  
 
 Post subject:
PostPosted: Tue Aug 19, 2008 10:15 am 
Offline

Joined: Mon May 26, 2008 11:09 pm
Posts: 272
Location: Paris, France
popo wrote:
The end position is usually beyond infinity, which is pretty far away! It is put there to allow for variations. Infinity is just a little before then.


I didn't know the difference between infinity and beyond infinity. What's the distance beyond which I should use beyond infinity?

And is the reddish color of sky due to the city lights?

Cheers,
Tony

_________________
GALLERY


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 12 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  

All words, images, videos and layout, copyright 2005-2012 Gordon Laing. May not be used without permission.
/ How we test / Best Cameras / Advertising / Camera reviews / Supporting Camera Labs

Webdesign by Alphabase IT
Powered by phpBB® Forum Software © phpBB Group