Nikon CPU lens q..............possible numpty content.

[Furyous]

When fitting a CPU lens to the body, the manual states that the aperture ring should be locked at the highest F number.

Why exactly ? Is it to to give the body a reference point, ie if you dont lock the ring and its only on say F12,will all the apertures then be incorrect ?

Also, am I right in assuming that the body can adjust the aperture internally ?


Sorry if it seems a stupid question, Im just trying to understand the workings of it all.

[_dobbo_]

The reason is that the body uses a small lever to adjust the aperture - a lever in the body connects to the lever on the lens to adjust the aperture. If the lens aperture ring isn't stopped all the way down, the lever doesn't have the full range of movement so the camera can't adjust aperture internally.

All that aside, the camera simply wont work unless you stop the lens all the way down.

[Furyous]

Cheers for that.Id guessed it something along those lines, but couldnt quite get my head round it.

Couldnt find any pics on google either.

[Furyous]

Further research turned this up which I found interesting....

http://www.photoscene.com/sw/tour/inside.htm

[_dobbo_]

That's a canon thing, I don't think canon lenses have the same way of controlling aperture.

If you look at your nikon lens you should be able to see the lever on it and move it - and you'll see the aperture changing when you do.