Pentax SMC 100mm f/4 Macro Lens
The Pentax 100mm f/4 Macro is a 100mm f/4 lens designed for Pentax K mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.
Pentax SMC 100mm f/4 Macro Lens
Get notified when one lists.
We'll text or email you the moment a Pentax 100mm f/4 Macro is listed on GearFocus.
Have a Pentax 100mm f/4 Macro sitting in your bag?
You'd be the first listing for this model.
Serious buyers are already watching — list yours in minutes.
Lens Overview — Pentax 100mm f/4 Macro
Key Features — Pentax 100mm f/4 Macro
100mm Prime Focal Length: Fixed 100mm provides a comfortable working distance between the lens and subject, reducing the risk of disturbing small or sensitive subjects during macro shooting.
1:1 Macro Capability: Designed specifically for close-up work, allowing life-size reproduction of subjects on the sensor.
Manual Focus Only: No autofocus motor means focus is fully under the photographer's control, which is well-suited to macro work where depth of field is extremely shallow.
f/4 Maximum Aperture: A dedicated macro aperture that balances usable depth of field with adequate light gathering for close-up subjects.
Full-Frame Coverage: Designed for full-frame sensors, so it can be used on both full-frame and APS-C Pentax K-mount bodies without vignetting.
Pentax K Mount: Native K-mount compatibility makes this lens a straightforward fit for a wide range of Pentax DSLR bodies.
Lens Specifications — Pentax 100mm f/4 Macro
| Spec | Detail |
|---|---|
| Use Cases | Macro, Product, Creative Effects |
| Lens Type | Macro |
| Format | Full Frame |
| Zoom/Prime | Prime |
| Focal Length | 100mm |
| Maximum Aperture | f/4 |
| Camera System | DSLR |
| Lens Mount | Pentax K |
| Autofocus | No |
| Focus Type | Manual |
| Image Stabilization | None |
| Filter Thread | 49mm |
Description — Pentax 100mm f/4 Macro
The Pentax SMC 100mm f/4 Macro is a prime lens built around the Pentax K mount, offering full-frame sensor coverage for use on DSLR camera systems. With a fixed 100mm focal length and a maximum aperture of f/4, it is purpose-designed for macro and close-up photography. The lens is manual focus only, with no autofocus capability — a setup that suits macro photographers who value exact, hands-on control over their focal plane.
Image stabilization is not present, so a steady hand or support is recommended when shooting at close distances. Accepting 49mm screw-in filters, this lens keeps your filter investment minimal, and its 290g weight ensures it remains a light, manageable option in the field. Straightforward and uncluttered in its feature set, the SMC 100mm f/4 Macro is a dedicated close-up tool for the Pentax K-mount shooter.
Pros — Pentax 100mm f/4 Macro
- ✓Lightweight at 290g, making it easy to handle during close-up shooting sessions
- ✓Full-frame coverage via Pentax K mount ensures compatibility across both full-frame and crop-sensor DSLR bodies
- ✓100mm prime focal length provides a useful working distance for macro subjects
Cons — Pentax 100mm f/4 Macro
- ✗No autofocus — manual focus only, which may slow down shooting for some users
- ✗Maximum aperture of f/4 is relatively modest, limiting light-gathering in low-light macro situations
- ✗No image stabilization, which can be a challenge when shooting handheld at close focusing distances
Videos — Pentax 100mm f/4 Macro
VINTAGE $100 Pentax Takumar Macro Lens vs a Modern $600 Canon Macro Lens — Mark Holtze
Frequently Asked Questions — Pentax 100mm f/4 Macro
Does this lens have autofocus?+
No, the Pentax SMC 100mm f/4 Macro is a manual focus only lens. There is no autofocus motor of any kind. Shooters must focus manually, which is common and often preferred for precise macro work.
What camera mount does this lens use?+
This lens uses the Pentax K mount, making it compatible with Pentax K-mount DSLR camera bodies. It is designed for full-frame coverage.
What filter size does this lens accept?+
The Pentax SMC 100mm f/4 Macro accepts 49mm screw-in filters, which is a relatively small and affordable thread size.
How heavy is this lens?+
The lens weighs 290g, making it a compact and lightweight option for a dedicated macro prime lens.
Can this lens be used on a crop-sensor Pentax body?+
Yes. Since the lens is designed for full-frame coverage with a Pentax K mount, it can be mounted on crop-sensor Pentax K-mount DSLRs without vignetting concerns.
Does this lens have image stabilization?+
No, the specifications confirm that image stabilization is listed as None on this lens. Any in-body stabilization would depend entirely on the camera body being used.