I don't know why I'm so stupid today. Crop factor question.

Started Jul 23, 2014 | Discussions thread
Shop cameras & lenses ▾
ForumParentFirstPreviousNextNext unread
Flat view
Northoceanbeach
Contributing MemberPosts: 502
Like?
I don't know why I'm so stupid today. Crop factor question.
Jul 23, 2014

Maybe its the rain, but for some reason my mind is toast.  I was looking at some manual focus contax lenses.  So I have a nex 7.

Lets say I put a 50mm old manual focus lens on it, one designed for full frame, on my camera it will be a 75mm because of the crop factor?

now let's say I put the e mount 50mm 1.8 on, the one designed for the nex.  It's still going to give me a 75mm focal length?

Because my camera has a 1.5 crop factor.  But does that affect lenses made for it like the sel50/1.8? Because if you put the sel50 on an A7, it crops it down and you don't get the whole picture, because it was designed for an aps-c sensor.

So why then would the sel50 on my nex not give me a true 50mm focal length, and it is only when I put on a lens designed for full farm, that it crops it and you multiply by 1.5.  Am I explaining this well?

ForumParentFirstPreviousNextNext unread
Flat view
Post (hide subjects)Posted by
ForumParentFirstPreviousNextNext unread
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow