For that FOV he likely does, but they only show up upon higher magnification.
With my 16/3.5 fisheye on FX (170 deg. FOV) I get the start of star trails in the far corners at 30 sec if I look close enough. It also depends on the portion of the sky you are imaging too . . . .
Good to know - somewhere I read that 20 seconds are about the limit. I will have to try longer, next time I get to a place where you can actually see stars...
pburke wrote:
Good to know - somewhere I read that 20 seconds are about the limit. I will have to try longer, next time I get to a place where you can actually see stars...
The exposure times to avoid star trails are primarily dependent on the focal length of the lens and your latitude. If you're between the equator and 30 degrees, try 400 divided by the focal length to arrive at max exposure times in seconds. If you're between 30 and 45 degrees try 500/focal length. Between 45 and 60 degrees try 600/focal length. And between 60 and 75 degrees, try 750/focal length. Pixel density may also play a role in the max times so I'd just use the formulas above and tweak for your sensor.
akclimber wrote:
The exposure times to avoid star trails are primarily dependent on the focal length of the lens and your latitude. If you're between the equator and 30 degrees, try 400 divided by the focal length to arrive at max exposure times in seconds. If you're between 30 and 45 degrees try 500/focal length. Between 45 and 60 degrees try 600/focal length. And between 60 and 75 degrees, try 750/focal length. Pixel density may also play a role in the max times so I'd just use the formulas above and tweak for your sensor.
Hope that's useful.
Cheers!
great formulas - will try it at 35 seconds next time I am up there. 10 seconds clearly was too slow to pull out any smaller stars. In fact, if it had not been freezing cold, I would have tried a whole range of shutter speeds, but when it's 10 F and mice are invading your tent you call it quits when the LCD shows some stars. Clearly, I could have gone to 20 sec or longer.
First outing with the Samyang 14mm on my D800E. Giants cave, Morialta conservation park, south australia. Looking forward to some more time with this lens, it's a good one.
markhout wrote:
OK - Lightroom Lens Correction back to zero, this is with PT Lens (cropped the black space that PT lens generates):
I need to get myself around to downloading/installing PT Lens - does it correct for color shift, too? I notice my 14mm has a slight cast to green in the corners when I shoot into the sun.
