help needed with night shots

carlogambino · Post by **carlogambino** » Wed Jul 14, 2004 9:22 pm

hihi besides astro i also like to do photography, esp taking long exposure night shots, but im not very good at it. Since i live near the causeway, here's one:(attached)

Any one knows how to reduce noise in this pic? I sued ISO 50(to reduce CCD graininess and noise), f8.0 and exposure of 13 secs.

gwenyi · Post by **gwenyi** » Wed Jul 14, 2004 11:24 pm

well... u can always get SBIG's ccd cams, which are equipped with cooling fans

. anyway, adobe photoshop 7.0 is relatively useful and it would be good to try.

by the way, how long are your exposures?

cheers,
wenyi

Post by **Airconvent** » Thu Jul 15, 2004 1:59 am

opps...your photo has disappeared!
we now accept attaching of images as long as they are not hugh.
since yours disappeared, it could only mean you attached a raw print.
please resize it down to 72 dpi and do not let the image exceed 50K.
cheers

rich

MooEy · Post by **MooEy** » Thu Jul 15, 2004 5:47 am

can't see anything, can't help much. for me i shoot film, not much problem with noise.

~MooEy~

carlogambino · Post by **carlogambino** » Fri Jul 16, 2004 11:16 pm

edited

gwenyi · Post by **gwenyi** » Fri Jul 16, 2004 11:29 pm

If u are serious about astrophotography, a 10s exposure would not suffice. However, you can always alter the ISO speed of the film to show more detail on the pic and that means more noise on cams using ccd chips. Thus, another good alternative would be to get slr cams with cable release to take long exposures would having to worry about noise. Coupling the slr cam with ektachrome professional ISO 200 film would be ideal for astrophotographers as the film is especially sensitive to the red spectrum

If tracking is provided, then a 40 min exposure would make every gasp when they see ur pic. haha.

2 cents,
wenyi

MooEy · Post by **MooEy** » Sun Jul 18, 2004 6:08 pm

*scratch head* where's the noise? i think u need let me see a full size one. usually the noise will be in the empty black areas, in the case of this pic, in the top right corner.

~MooEy~