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61ache
12th of February 2008 (Tue), 11:24
Took some night shots last night and noticed on a lot of my images blue streaks. Is this flare or dust showing?

244422

Particulars: Canon 400D, EF50mm F1.8II
f14 15" ISO 100.
bryank930
13th of February 2008 (Wed), 16:42
Ghosts! :eek:
canusa
13th of February 2008 (Wed), 16:45
Do those blue smudges appear in the same spot in all the images. Dust doesn't usually show up in colour :P
edge900rr
13th of February 2008 (Wed), 18:40
ALIENS!!!!!
61ache
13th of February 2008 (Wed), 21:16
ALIENS!!!!!

Must be aliens. I'm calling UFO hunters. They don't show up in the same spot. Are being picked up int the dark sky--not always but usually around lights. I was using a small aperature with long shutter times (just fooling around and experimenting). This kind of leads me to believe its some sort of optics reflection. Another idea I had for possibility was that the camera (400D) had problems reproducing a certain shade of black. I thought someone with more experience would know right away.

Leads me to a question, with skylines at night where I want lots of DOF but want to minimize shutter time what's a good aperature? 7, higher, lower, etc?
Tdragone
14th of February 2008 (Thu), 20:49
Leads me to a question, with skylines at night where I want lots of DOF but want to minimize shutter time what's a good aperature? 7, higher, lower, etc?

All I can say is experiment!
Different lenses will produce different 'stars' around lights at different Apertures.
For my 17-40; I like F8
For my 10-22; I usually use F16