Originally posted by gordon_l34 Good Evening All,
I want to try star trails using a Super A with a 400 ASA film. I have an A series f2 50mm, 3.5 35-105 and an f4 70-210 lens to choose from. what are your suggestions regarding settings.
I was advised not to use my K20D as it would possibly burn out the sensor on a long exposure.
Regards,
Gordon.
Gordon, there is obviously some urban myth about sensor burn out. That is nonsense, as long as you don't put a 400/2.8 lens on the camera and expose the sun for a minute fully open…
The thing is, that the sensor gets warm, some call it hot, at long exposures, which leads to an annoying level of noise and a very visible noise gradient in the image. The K20 seems to be quite sensible to this. But this will not damage the camera.
Nevertheless for long star trails a film camera is the better option, at least for starters. Use the widest lens you have and expsore for at least 20 minutes. This gives a good length to the single star trail, short trails just look as whether you had camera shake. If you live near city lights, stop down the aperture to f/8 or smaller with your 400ASA film. Out under really dark skies, you can open up to f/5.6 or so.
One important thing about star trails: look for a place with a nice foreground (tree silhouttes or a mountain range or whatever), because including some foreground detail makes the image much more interesting.
Ben