The Pentax SMC FA 645 80-160mm f/4.5 is a legacy telephoto zoom lens that’s compatible with the . Key features include:
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63 to 126.5mm-equivalent focal range after crop factor
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Excellent for portraiture
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Clutch design for fast autofocus/manual-focus switching
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Advanced optical design for high-quality images
Telephoto Zoom. With a focal range equivalent to 63-126.5mm after sensor crop factor, the 80-160mm f/4.5 is a high-quality zoom that covers the normal to telephoto/portrait focal lengths. Its range makes it a great choice for portrait or any other type of photography where you’d need telephoto zoom range options.
Autofocus/Manual-Focus Clutch. The 80-160mm f/4.5 uses a clutch design to switch between AF and MF, giving you fast access to make minute manual-focusing tweaks.
Please Note. This is a legacy lens that was originally designed for medium-format film cameras. We’ve noticed that it tends to slightly front- or back-focus, so you’ll want to make sure you microfocus adjust before you start shooting.
| Angle of View |
21.5° to 47° |
| Aperture |
f/4.5-32 |
| Autofocus |
Autofocus |
| Brand |
Pentax |
| Compatibility |
Medium Format |
| Diameter |
3.35″ |
| Dimensions |
Length: 5.14″ |
| Filter Size |
77.0mm (nonrotating front element) |
| Filter Style |
nonrotating front element |
| Focal Length |
80.0-160.0 |
| Groups/Elements |
10/11 |
| Hood Included |
Yes |
| Hood Type |
PH-RBF77 |
| Image Stabilization |
No |
| Item Type |
Lens |
| Lens Type |
Normal Range and Telephoto |
| Low Dispersion Elements |
0 |
| Max Aperture |
4.5 |
| Maximum Magnification |
.17x |
| Minimum Aperture |
22.0 |
| Minimum Focusing Distance |
3.28feet |
| Mount |
Pentax 645 |
| Weather Resistant |
N/A |
| Weight |
2.22 lb |
| Zoom Method |
Barrel-extending |














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