020-7828 4925|Store Opening Hours|Glossary Est. 1985 - the Kind of Service of which Legends are Made
Some Important Information For Our Customers
In line with the Government’s announcement of new Tier 4 restrictions for London, the shop is no longer open for appointments. However, you can still shop with us online or over the telephone if you prefer on 020-7828 4925, Monday to Friday 10:00 a.m. to 5:30 p.m..
Grays of Westminster
Online Shop
New Equipment
New Equipment
New Nikon Camera Equipment
Nikon Manual Focus Lenses Pricelist
Price-Match Guarantee
Instruction Manuals
Hawkesmill Bags & Straps
Think Tank Camera Bags
Book Shop
Grays Merchandise
Ordering Information
Finance
Currency Converter
Nikon Data
Gift Certificates
Second-hand Equipment
Second-hand Equipment
Autofocus Nikkor Lenses
Nikon Digital Cameras
Nikon 35mm Film Cameras
Nikon Mirrorless
Manual Focus Nikkor Lenses
Vintage & Pre-AI Nikkor Lenses
Nikon Rangefinder Equipment
Nikon Accessories
Nikonos
Nikon Cine Cameras
Second-hand Grading
Wants List
Wanted for Cash
How to Find Us
Contact Us
About Us
News
Events
An Introduction
Grays of Westminster Film
Testimonials
In The Movies
Grays of Westminster Gazette
Tour the Shop
Awards
What the Press say
What other websites say
Book an appointment
Blog
Store Opening Hours
Glossary
Glossary

Home / Glossary

Photographic Definitions & Questions

Nikkor Ai-P lenses

All auto-focus Nikkor lenses have what Nikon refer to as a built-in Central Processing Unit, or CPU, (strictly speaking it is not a CPU but an encoding micro-chip that passes information to and fro between the lens and camera body). The advanced automatic features and exposure control available with many of the current range, and more recent AF Nikon SLR cameras require AF Nikkor lenses to have this technology in order that they can operate with full compatibility.

Generally, manual focus Nikkor lenses do not have a CPU. However, Nikon does produce three manual focus lenses that do include a CPU. They are the:

  • Nikkor 45mm f/2.8 P
  • Nikkor 500mm f/4 P
  • PC-Micro Nikkor 85mm f/2.8D

These are usually referred to as an Ai-P, or P-type Nikkor lens, although it is somewhat confusing that the latter carries the 'D' designation (in common with many AF Nikkor lenses) in place of the 'P' designation. All three lenses provide full functionality with the exposure modes and TTL metering systems of compatible manual focus and auto-focus Nikon cameras.

Join our Mailing List Go

MAIN MENU

Home

New Equipment
Second-hand Equipment
Wanted for Cash
How to Find Us
Contact Us
About Us
Blog
Store Opening Hours
Glossary
CONTACT US

40 Churton Street
Pimlico, London
SW1V 2LP, England

Telephone: +44 (0)20-7828 4925
E-mail: info@graysofwestminster.co.uk

Opening hours:
Mon - Fri: 10:00am - 5:30pm
Closed on Public and Bank Holidays

CORPORATE

Registered in
England & Wales.

Registered office:
40 Churton Street
Pimlico, London
SW1V 2LP, England

Company Reg. No. 5652450

VAT No. 872 2684 03

SUNDAY
7
MARCH
Copyright 2021 Grays of Westminster. All Rights Reserved. Site by Amazing Internet
Terms & Conditions|Privacy Policy|Cookies