D200 + PN 11 extension tube

[dave_osborne]

Hi there,

Excuse what may be a silly question - my D200 just landed yesterday so I'm still

getting to grips with it.

 

I was curious whether it's possible to get matrix metering with a Micro 105/2.8

MF + PN-11 extension tube.

I know that would mean entering the max aperture and focal length in the non cpu

lens data - but given there is no 157mm option in the menu (105 + 52.2 ish) can

I assume it's only possible to get centre weighted and spot metering with this

set up?

 

Thanks in advance,

Dave.

[akira]

Hi, Dave,

 

You don't need to multiply the FOV factor of the Ai lens. All you have to do is just to dial in 105/2.8, put PN-11 tube normally between the Micro and the body, and shoot away. The camera will compensate for the exposure value for close-ups automatically just like conventional TTL film cameras.

 

Hope you enjoy your new toy!

[arnabdas]

157mm option in the menu (105 + 52.2 ish)

 

Are you sure that's the correct effective FL with PN11? I was under the impression focal length shortens with either diopter or extension.

[dave_osborne]

No I'm not all all sure... from the link it sounds I was misunderstanding that moving the lens away from the focal plane would simulate increasing the focal length. From this ( http://xoomer.alice.it/ripolini/Close_up.htm ) it looks like that's not the case.

I lost the will to live a few paragraphs in though so what the hell it *does* do to focal length I still have no idea!

[Michael R Freeman]

The PN-11 tube adds extension, not focal length. As to the change (decrease) in effective focal length of the 105/2.8 Micro (AIS and AF-D versions) as the lens is focused closer, I believe that it is more influenced by the complex shift in internal element groups and the CRC feature, than by the extension of the lens helical itself. Different versions of the 105/2.8 have different effective focal lengths when focused to their minimum - only 60mm for the AF-D at 1:1, and 88mm for the AIS at 1:2 and 1:1 (with the PN-11).

 

It doesn't matter anyway me thinks, as probably the only thing the D200 does with the *focal length* data (other than store it in memory) is to write it to the EXIF data. I think the main reason for entering the maximum aperture AND focal length is that it allows you to store several non-CPU lenses in memory for future recall.

 

Enter 105mm and don't worry about it. That will give you the option of all metering modes, including 2D matrix.

[klix]

<i>It doesn't matter anyway me thinks, as probably the only thing the D200 does with the *focal length* data (other than store it in memory) is to write it to the EXIF data. I think the main reason for entering the maximum aperture AND focal length is that it allows you to store several non-CPU lenses in memory for future recall. -- Michael Freeman.</i>

<p><p>

That is my understanding as well. The focal length and max aperture that you dial in are just "IDENTIFIERS," NOT the true focal length or aperture. You might as well dial in 1000mm as FL and 1.2 as max aperture, the exposure will be the same as entering 105mm and setting max aperture to 2.8. Only the exif data will be different.

<p><p>

KL

<p>

[rjacksonphoto]

I use the PK-13 and simply enter the actual lens focal length (i.e. 85mm) into the D200 and get good exposures.

[david_h._hartman]

The focal length of a lens is distance from the

rear principle point of the optical design to the film or sensor

plane at infinity. The effective focal length is the

distance to the film or sensor as used. For example the 105/4.0

AIS Micro-Nikkor has an effective focal length of 210mm at 1:1

using 52.5mm or helical extension and 52.5mm of the PN-11. The

105/2.8 AIS Micro-Nikkor has CRC which causes some loss of

effective focal length so its effective focal length is

somewhat less than the 105/4.0 Micro-Nikkor when focused close.<br>

<br>

It is very important to set the correct maximum aperture of the

lens in the non-CPU lens data. You can easily test this by

missetting the maximum aperture while setting the correct focal

length. Shoot three shots with the maximum aperture reported as f/1.2,

f/2.8 and f/5.0 with a shooting distance of several meters out to

infinity. The error in exposure with incorrect data is obvious. <br>

<br>

Since I own a 105/2.5 AIS I give the 105mm non-CPU data memory to

that lens. My 105/4.0 AI and 105/2.8 AIS Micro-Nikkor share the

100mm slot. I always enter the correct maximum aperture. I do not

set the effective maximum aperture for AI and AIS

Micro-Nikkor lenses. I once recommended that and got call on it

by Oivind Toien. I think he was right, that is the AI meter

coupling takes care of the exposure factor or effective maximum

aperture when focusing close. Im not sure what I was

thinking.<br>

<br>

Here is a sample of matrix metering with correct and miss set non-CPU

data at several meters. The test lens was the 105/2.8 AIS Micro-Nikkor...<br>

<br>

<img

src="http://www.photo.net/bboard-uploads//00Gjz0-30272784.jpg"><br>

<br>

...can I assume it's only possible to get centre weighted

and spot metering with this set up? --Dave Osborne<br>

<br>

You can have color matrix metering and i-TTL flash as well as

center-weighted and spot metering.<br>

<br>

Best,<br>

<br>

Dave Hartman.

[dave_osborne]

Thanks for all the answers... that's very good to know!

[dan_renner]

<p>I was noticing the comments on the PN-11 extension tube and was hoping I might be able to get a little help from someone with experience. I just bought a PN-11 and mounted it to me Nikon D200. Everything mounted up as expected but now the extension tube won't come off of the camera. The lens release on the camera body doesn't seem to function properly with the extension tube and I don't see any other releases. Anyone have any ideas?</p>

[Michael R Freeman]

<p>It's better to post a NEW question as a separate topic rather than pose it as a reply in a long dead (3+ years) thread. I only saw your question because I had a long forgotten email alert for this topic.</p>

<p>Mounting (and removing) a PN-11 should be no different than mounting any other manual focus AI or AIS lens. The back end mount of the PN-11 is identical to the mount on any of your other Nikon lenses, with a small slot at 9 o'clock that engages the lens release lock pin.</p>

<p>Try rotating the tube back and forth (don't force it) as you push the lens release button on the D200 to see if that will help.</p>