Long Exposure calculating?

Started 8 months ago | Discussions thread
ForumParentFirstPreviousNextNext unread
Flat view
Colin Franks
Senior MemberPosts: 1,117Gear list
Like?
Long Exposure calculating?
8 months ago

Scenerio: After sunset, getting somewhat dark-ish.

Goal: Long exposure of landscape/sky/clouds with 10-stop ND filter.

If normal exposure time (without filter) is say 1.6 seconds (F11; low ISO), this means about 24 minutes exposure with filter. But how does one account & calculate for the fact that in that 24 minute exposure, it's going to get even darker outside, meaning more time required?

 Colin Franks's gear list:Colin Franks's gear list
Panasonic Lumix DMC-G3 Canon EOS 6D Panasonic Lumix G Vario 14-45mm F3.5-5.6 ASPH OIS Canon EF 50mm f/1.2L USM Tamron SP AF 17-35mm F/2.8-4 Di LD Aspherical (IF) +17 more
ForumParentFirstPreviousNextNext unread
Flat view
ForumParentFirstPreviousNextNext unread
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow