AT-X Pro - professional line (constant aperture zooms or primes)
AT-X - consumer line
IF - Internal Focus System
FE - Floating Element System
NH - No Hood (10-17mm fisheye without built-in hood)
Optical design:
AS - Aspherical Optics
F&R - Advanced Aspherical Optics
SD - Super Low Dispersion
HLD - High-Refraction and Low Dispersion
MC - Multi-Coating
Lenses
Tokina 135mm f2.8 lens on an Olympus Digital body
Zoom
AT-X 107 DX AF fisheye 10-17mm f/3.5~4.5 (available with and without the built-in hood. No hood version can be used on full-frame. The lens is also sold under Pentax brand.)
AT-X 116 PRO DX AF 11–16mm f/2.8
AT-X PRO SD 11–20mm f/2.8 (IF) DX
AT-X 124 PRO DX AF 12–24mm f/4 (The lens is also sold under Pentax brand)
AT-X 124 PRO DX II SD IF AF 12–24mm f/4
AT-X PRO DX AF 12-28mm f/4
AT-X PRO FX AF 16-28mm f/2.8
AT-X 165 PRO DX AF 16–50mm f/2.8 (The lens is also sold under Pentax brand)
AT-X DX AF 16.5-135mm f/3.5-5.6
AT-X PRO FX AF 17-35mm f/4
AF 193 19-35mm f/3.5~4.5 (made by Cosina)
AT-X 235 PRO AF 20-35mm f/2.8
AF 235 20-35mm f/3.5-4.5 (72mm filter)
AF 235 II 20-35mm f/3.5-4.5 (77mm filter)
AT-X 240 AF 24-40mm f/2.8
AT-X 24-70mm PRO FX f/2.8
AT-X 242 AF 24-200mm f/3.5~5.6
RMC 25-50mm f/4
AT-X 270 PRO AF 28-70mm f/2.6-2.8
SZ-X 287 28-70mm f/2.8-4.3
AT-X 287 PRO SV AF 28–70mm f/2.8
AT-X AF 28-70mm f/2.8
AT-X 280 PRO AF 28-80mm f/2.8
SZ-X 270 SD 28-70mm f/3.5-4.5
AT-X 285 28-85mm f/3.5-4.5
AF 28-80 f/3.5-5.6
SMZ 287 28-70mm f/4
RMC 28-85mm f/4
AT-X 235 28-135mm f/4-4.6
AT-X 357 35-70mm f/2.8
RMC 35-70mm f/3.5
RMC 35-105mm f/3.5
SMZ 35-105mm f/3.5-4.3
RMC 35-135mm f/4-4.5
AT-X 352 35-200mm f/3.5-4.5
AT-X SD 35-200mm f/3.5-4.5
AF 353 SD 35-300mm f/4.5-6.7
AT-X 535 PRO DX AF 50–135mm f/2.8 (The lens is also sold under Pentax brand)
EMZ 520 50-200mm f/3.5-4.5
AT-X 525 50-250mm f/4-5.6
AT-X 120 60-120mm f/2.8
AT-X PRO FX AF 70-200mm f/4 VCM-S (image stabilization)
RMC 70-210mm f/3.5
RMC 70-210mm f/4
RMC 70-220mm f/3.5
RMC 75-150mm f/3.8
SMZ 75 75-260mm f/4.5
AT-X SD 80-200mm f/2.8
AT-X 828 AF 80-200mm f/2.8
AT-X 828 PRO AF 80-200mm f/2.8
SMZ 835 80-200mm f/3.5-4.5
SZ 820 80-200mm f/4.0
RMC 80-200mm f/4.0
RMC 80-200mmf/4.0
SMZ 845 80-200mm f/4.5
RMC 80-250mm f/4.5
AT-X 840 AF 80-400mm f/4.5-5.6
AT-X 840 PRO D AF 80-400mm f/4.5~5.6
AT-X 100-300mm SD f/4
AT-X 340 AF 100-300mm f/4
AT-X 340 AF II 100-300mm f/4
RMC 100-300mm f/5
SZ 10 100-300mm f/5.6
AT-X 150-500mm f/5.6
SZ-X 205 28-105mm f/4-5.3
SZ-X SD 35-200mm f/4-5.6
SZ-X 210 SD 70-210mm f/4-5.6
SZ-X 820 80-200mm f/4.5 (filter 55mm)
SZ-X 80-200mm f/ 4.5-5.6 (filter 49mm & 52mm)
RMC 90-230mm f/4.5
Prime
100mm macro400mm telephoto
SL 17 17mm f/3.5
AT-X 17 AF 17mm f/3.5
AT-X 17 PRO AF 17mm f/3.5
RMC 17 17mm f/3.5
FiRIN 20mm f/2.0 FE MF
RMC 24mm f/2.8
SL 24 24mm f/2.8
RMC 28mm f/2
RMC 28mm f/2.8
SL 28 28mm f/2.8
AT-X M35 PRO DX AF 35mm f/2.8 MACRO
SL 35 35mm f/2.8
Opera 50mm f/1.4
AT-X M90 90mm f/2.5 MACRO
AT-X M100 AF 100mm f/2.8 MACRO (internal focus, 1:2)