===== Pentax 67 SMC Takumar 400mm f/4 ED [IF] ===== 
{{ :lens:pentax400mm6x7f4edif.png?400|}}
==== Summary ====
The SMC Pentax-M★ 67 400mm f/4 ED [IF] is the final and most advanced 400mm telephoto lens designed for the Pentax 6×7 medium format system, introduced in 1986 and produced until the system’s discontinuation in the early 2000s. It replaced the earlier Takumar and SMC 400mm f/4 designs with a completely new optical formula, incorporating ED (Extra-low Dispersion) glass and internal focusing (IF)—a major leap in both performance and usability. Optically, it features a 9-element - 9-group design with Super Multi-Coating (SMC) and a 9-blade automatic diaphragm. The lens stops down to f/45, focuses as close as 2.8 meters, and delivers a 0.01× magnification ratio. It uses rear-mounted 67mm drop-in filters, weighs a hefty 3.7kg, and measures 132.5 × 305mm. It includes a built-in rotating hood, removable rear filter holder, tripod collar, and strap lugs for easier handling. The lens ships in a dedicated metal trunk and was often paired with a padded leather hood cover and optional CPL 67 polarizer*.
==== Tech Specs ====
| Manufacturer    |Pentax|
| Series          |67|
| Model           |SMC Takumar|
| Focal Length    |400mm|
| Max Aperture    |f/4 ED [IF]|
| Min Aperture    |f/45|
| Format          |6x7|
| Image Circle    |-|
| Minimum Focus   |280cm|
| Focus Rotation  |°|
| Iris Blades     |9|
| Optical Design  |9/9|
| Squeeze         |none|
| Front Diameter  |132.5mm|
| Filter Thread   |67mm (rear)|
| Focus/Zoom Rod  |none|
| Native Mount    |Pentax 6x7|
| Data Protocol   |none|
| Length          |305mm|
| Weight          |3700g|
| Body Telescope  |-|
| Body Material   |-|
| Focus Drive     |-|
| Iris Drive      |-|
| Zoom Drive      |-|
==== History ====
Country of Origin:  \\
Release Date: 1986 \\
Launch Price:  \\
Design Revisions:  \\

==== Service ====
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Service Manual: (Insert link to manual here) \\
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Full CLA: **TBD hrs.**\\
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==== Cine-Mod ====
<nodisp 8>
Focus Ring O.D.: -\\
Zoom Ring O.D.: -\\
Iris Ring O.D.: -\\
De-click Y/N: -\\
Additional Notes: \\
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==== Notes ====
==== Media ====