Difference between Nikon AI and AI-S lenses?

I am aware that AI-S is newer and that some AI-S lenses such as the 28 mm f/2.8 has a much improved optical formula with CRC compared to its AI predecessor. But what I am looking for is the technical difference between the systems.

If you want to subscribe to this thread and get an email every time the thread is updated, you need to register. Registration is free and carry no obligations.

One response:

avatar

The main difference is that with AI-S, there is a standardised linear relationship between the movement of the stop-down tab at the rear of the lens and the aperture opening. I.e. moving the tab a known amount stops down the lens to a known aperture. This is required for accurate exposures in shutter priority and program modes. AI lenses do not do this.

In addition, AI-S lenses will automatically trigger the high speed program mode (where the camera will pick a shorter exposure time for hand-holding) with the FA and F501/N2010 if the focal length is 135 mm or longer.

However, only a few old camera models, such as the FA (1983) and F501/N2020 (1986) make use of these features. Newer cameras (including the F3, F4, F5, F6, the FE and FM-series and all digital models) treat AI and AI-S as the same. These models do not let the photographer use shutter priority or program modes with any manual lenses. For these models, the AI-S functionality is redundant (unless the lens is “chipped”).

If a manual focus lens is “chipped”, setting the aperture on the body, instead on the lens itself, only works with an AI-S lens.

Leave a comment.

Title (optional):

Comment:

Enter the caracters below into the Verify-field to indicate that you are not a spambot.
To avoid having to enter a verify code, register at the site and log in before posting.
CAPTCHA Image new image 2
Verify code:  (Required.)
Your name:   (Required.)
Your email:   (Will not be published.)

Notice: If you feel that you have found inappropriate content on this site, please let us know by contacting us with the with the URL of problematic page. TIA.

This page is from: http://dpanswers.com/roztr/content_show.php