Just got back from hiking in the Grand Canyon. It was a bit cold but really beautiful with almost no crowds. Here is a night shot (30s exposure) from the bridge to Bright Angel campground. Only the moon was lighting the scene of this view of the Bright Angel Creek flowing towards the Colorado River. Jupiter is the bright object in the sky.
It is hard to compose in the darkness using the viewfinder so I relied on the bubble level on the hotshoe to get me close. I found that away from the city lights with the mixed white balance that daylight gave the most realistic color representation.
Thanks, Larry, at 100% you can see the movement of the stars but just barely. There is a rule of thumb of 500/(Focal Length) to give the shutter speed where blurring will be evident. On my 8mm DX convert to full frame for the formula and I have 500/(8 * 1.5) = 42 seconds. So 30 seconds is still OK by the formula. Shooting wide open is not the best for producing sharp images but stopping down would increase the shutter time and increasing the ISO would create intolerable noise robbing detail. Trade offs.
Sat 22-Dec-12 07:09 PM | edited Sat 22-Dec-12 07:11 PM by MasterDabber
A very nice image Dean. An interesting comment regarding the use of the bubble level. I'm optimistic that Father Christmas is bringing me a D7000 for Christmas... hope I can produce something as nice. Derek
I'm sure you will find some interesting subjects for your new D7000. Maybe you should look for a bubble level in your stocking as the built in sensor will only indicate one axis of information and a wide angle or fisheye needs to be level in two planes to avoid distortion effects unless that's what you are looking to produce.
This is a very special photo, Dean. After using the formula to determine a 30 second expoasure did you then set the other variable manually by trial and error or did you let the D7000 determine aperture and ISO settings. I'd be interested in hearing a more detailed explanation of your methodolgy.
I did not even check to see what the camera would have suggested although I think it may have been pretty close. I know the the noise increases at ISOs higher than 1250 at a rate that causes diminishing returns on usable sharpness balanced against unsightly blotches of color noise. I had been doing some similar shots down by the river and settled in on the ISO and the aperture of that lens if wide open at f/3.5.
No, it's not de-fished. The lens has a pretty nice distortion pattern and if I keep it level the results look normal. I don't have any specific software to accomplish this. Do you or anyone else have something to recommend?