Star Trail questions

I've tried this one and it didn't work out well for me. Now I've been doing some reading and some people crank up their ISO really high for this. Is the worry about Noise not there since your add dark frames anyways? (About want ISO should I be around? Another problem i've been having is that once I started stacking the photo's and the end result wasn't seemless and didn't really stick out like alot of people's pictures that i've seen.

Noise isn't as big of an issue since you will be doing dark frames. On the 7D you can easily go to ISO1600, and probably 3200 without problems. The main reason for this is to get the fainter stars to show up. As far as the non-seamless look, that's from the camera buffering inbetween shots. Best thing to do is to turn off all the noise reduction, live view, image viewing after, etc. Basically anything the camera does after taking a picture takes time away. This time away is what the gaps show. Since you are doing star trails, you won't be confined to a lower shutter speed, either.

Could the buffering issue be due to the large size of the RAW files as well? The last time I tried this I turned off noise reduction and preview. Now would it work if I placed it to in Continuous drive mode on Tv with 30sec exposure? Or should this be kept on bulb at 30's at a time?

Well you would need a shutter remote and just do it in manual at your largest aperture, 30s, and start it with the remote and slide it so it stays pressed. Has to be in continuous drive mode.

I have a remote and such I just wanted to see which way was deemed correct either bulb mode or if Tv set at 30s on continuous drive mode work the same way.

seoul4korea wrote in post #11945226
Could the buffering issue be due to the large size of the RAW files as well?

Nope. The 7D has a buffer that can hold at least 15 raw files. Any delay between one shot and the next is due to the camera doing noise-reduction etc.

seoul4korea wrote in post #11947278
I have a remote and such I just wanted to see which way was deemed correct either bulb mode or if Tv set at 30s on continuous drive mode work the same way.

Bulb mode will just take a single exposure for as long as the shutter is held down. Just switch it to M mode, largest aperture for the lens, continuous drive, 30s exposure, ISO 1600 or so. Stack up all the shots in the startrails.de program.

kk I'll try this out and get back at ya. Thanks agian.