LumoLabs: Pentax K-5 low light focus study is published

Started Feb 23, 2011 | Discussions thread
falconeyes
OP falconeyes Senior Member • Posts: 1,486
Re: Typo??????

janneman02 wrote:

falconeyes wrote:

The paper contains an example. IIRC, it says something like 25cm on 1m distance at 31mm f/1.8.

IIRC?? you wrote it yourself....
25cm on a 1 m distance???? That is a lot... sure it is not 25mm????

I think your response isn't polite.
The fact I wrote it doesn't mean I know every sentence by heart.

The focus shift in subject space for a focal length of 31mm and 250µm defocus is easily computed from the thin lens formula (using a pocket calculator).
http://en.wikipedia.org/wiki/Thin_lens

 falconeyes's gear list:falconeyes's gear list
Sony RX100 III Pentax *ist DS Nikon D800E Nikon D500 808
Post (hide subjects) Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow