... Help with D100 aperture

cosmicnode wrote:

Neil-O wrote:

cosmicnode wrote:

Neil-O wrote:

cosmicnode wrote:

Neil-O wrote:

Iain G Foulds wrote:

... Mait: I have two lenses now. The other being the Zenitar 85/1.4, a manual focus lens, and the aperture ring works perfectly.

... Think Neil has it. Simply a matter of the incompatibility of certain older lenses with certain older cameras.

Iain - I can't seem to find the discussion I recall about third party lens compatibility, but I'm sure there was talk about some lenses having to be "rechipped" - at some expense - by the manufacturer. What puzzles me about your problem is that you would assume the compatibility issue would arise with newer cameras, not older ones. In other words, it would be fair to assume that a lens would work with any camera made before the date the lens was manufactured, but not necessarily newer cameras. I could understand it if the lens worked with the D100 not the D200.

So, I wonder if the reason the lens works with the D200 is because the D200 has the ability to function with non CPU lenses, and it's seeing the Tokina as a non CPU lens..?

What happens if you put the lens on your D40?

I have found at least 3 Nikon camera bodies that requires that you choose if the option of the aperture remaining fixed as you zoom and the second option is to remain a constant number of stops from the max aperture as you zoom. this body is the D1, D1X and D1H which are a little older than the D100 but you can see with the 2 choices Nikon made this may have made it difficult for 3rd party lens manufacturers to fully function as a Nikon equivalent. unless the D100 has this setting

Custom menu 19, Aperture control

Option 0, "Aperture does not change with focal length or lens to film distance, is the default"

Option 1 "Aperture is maintained at a value a constant number of steps from the maximum aperture for the current focal length or lens to film distance"

It could be that Nikon did not give this choice to the d100. but set it to simply chose option 0, it would be interesting to see how a Nikon variable aperture lens functioned on the body.

But this doesn't explain why Iain can't set the aperture manually.

I found a online D100 manual, It basically say's you have to lock the aperture ring at the min setting to be able to take a photo. that is in the section Attaching a lens.

I was under the impression Ian's Tokina is a "gelded" lens..?

If it isn't he would still be able to set the aperture with the ring manually, or electronically by locking the ring as you do with D type lenses. Unless I have completely misunderstood, the Tokina lens relies on the CPU contacts to set aperture with the sub command dial, and it won't work with the D100.

You cant set the aperture manually on the D100 with D type lenses or on many other bodies, they need a setting in the menu for aperture control, either with the control ring or the aperture ring. only a few bodies have this setting.

You can set the aperture manually on the D100, with a D or G type lens - I don't know what you mean by menu setting.  On either type of lens the aperture is controlled by the sub command dial you don't have to go into the menu or anything.