Out of focus with converter TC-E2

Started Jan 10, 2004 | Discussions thread
Henrik 1881
Forum MemberPosts: 61Gear list
Like?
Re: Out of focus with converter TC-E2
In reply to Ching-Kuang Shene, Jan 11, 2004

Thank you Ching-Kuang Shene,

Great answer. Great link. I'll save it.

I still think this should be mentioned in the manual. (I can't find information about it anyway.) And I still wonder why the infinity position shouldn't work. I mean, you set the camera to converter position so the camera knows it is mounted. Couldn't Nikon fix some software so the infinity position can be used together with converter lenses?

Thanks again,
Henrik

Ching-Kuang Shene wrote:

Henrik 1881 wrote:

In my CP 4500 manual it says "Use auto focus when optional
converter lens is attached. In manual focus mode, the actual focus
distance will differ from that shown in the monitor."

Yes, this is a typical problem when using afocal systems (e.g.,
front mounting converters). The second part means that this
distance reported by the camera (e.g., 3 feet) may not actually
mean 3 feet if a converter is mounted. The camera uses its step
motor for distance calculation when focusing. If a converter is
mounted, focal length is shifted and hence the step motor can no
longer accurately report the distance.

That seems to be true when using the infinity position too. Anyone
than can confirm this? Or is it something wrong with my Nikon CP
4500?

Yes, you are right. Infinity distance means the lens moves back to
its shortest barrel lens (for most cases). This focusing distance
is wrong for many converters. Consequently, there is nothing wrong
with your 4500.

I believe I have the same problem with the WC-E63 too, but it is
more difficult to see due to the longer depth of focus.

It can happen to many or virtually all front mounting converters.
Take a look at the "Converter Lenses" section of my 4500 user guide
for more details.

CK
http://www.cs.mtu.edu/~shene/DigiCam
Nikon Coolpix 950/990/995/2500/4500/5700 User Guide

Reply   Reply with quote   Complain
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow