新手星光

lsman1

just outside my house... but the street light is very strong....
I wished it will be darker...


f9 48 min ISO100 27mm

[ 本帖最後由 lsman1 於 2008-10-21 12:33 編輯 ]

initials

影星軌光圈太細, 條軌跡唔係咁明顯...
long time ago...


[ 本帖最後由 initials 於 2008-10-21 12:43 編輯 ]

lsman1

i have one f5.6 and 15 mins
The sky almost the same brightness
(but out of focus so... )

another f4 and half an hour all go white...LOL.. I need to find a "darker sky"

initials

原帖由 lsman1 於 2008-10-21 12:48 發表
i have one f5.6 and 15 mins
The sky almost the same brightness
(but out of focus so... )

another f4 and half an hour all go white...LOL.. I need to find a "darker sky"

you need to go to country side and there is no cloud on the sky...
if you want to shoot in the city, you have to expose less time and shoot continuously and then ps the stack...

lsman1

yeah... if you look closely there is actually a plane left a trail of its own.

But this is fun... at 45F weather...

KKKK

How come the sky was rotating ......

Funny!

lsman1

原帖由 KKKK 於 2008-10-21 20:43 發表
How come the sky was rotating ......

Funny!

star rotates against the North pole star a full circle every 24 hours.

From what I read, usually 2 main approach....

#1. (like me) find the North star (actually my 2nd night try... I just find North and point to sky... it happen to be around the North star...lucky...) and point to it... You may want to position the star other than the center of frame. Usually in this approach you try to have a longer exp

#2 (like initials) point East or West... the lines will be more straight and shorter exp gives "longer" trail.

There are more ticks into it too.
#1. black card in between (as initials does, there is one "broken" in the lines) or at end to make it look like "  !  "
#2. black card then small focus change. It may give enlarge trail effort.


---------Tools------------
tripod, shutter cord, camera with "BULB" mode, fully charge battery, compass if you need to local the north. May be a flash light (or color paper/gel to cover the light) if you want to "paint" the near object (tree, building etc), Mirror lock up (but I didn't do...)

what I need now is a warmer night and a darker sky..  Look forward to play more


Another approach is take hundreds of same pictures in 30s and minutes apart.. Then PS them to one...
(I didn't have PS, so its out of question)

[ 本帖最後由 lsman1 於 2008-10-22 01:11 編輯 ]

initials

haha, i just gave a try as there was a quite clear sky...
actually, i have no idea about astronomy as well as photography...