Pentax smc DA* 300mm f/4 ED [IF] SDM
Professional-grade weather-sealed telephoto prime lens
![Pentax smc DA* 300mm f/4 ED [IF] SDM](https://www.lightandcomposition.com/wp-content/uploads/2026/04/Pentax-smc-DA-300mm-f4-ED-IF-SDM-gear-image-generated.png)
Key Features
Lens Capabilities
Click the Links Below for Details
The Most Important Rings & Switches — Pentax smc DA* 300mm f/4 ED [IF] SDM
| Ring / Switch / Control | Status | Note |
|---|---|---|
| Focus Ring | ✓ Present | Manual focus clutch mechanism |
| Zoom Ring | ✗ Not Present | Prime lens |
| Aperture Ring | ✗ Not Present | Controlled via camera body |
| AF/MF Switch | ✓ Present | On lens barrel |
| Image Stabilisation Switch | ✗ Not Present | Handled by IBIS in camera |
| Focus Limiter Switch | ✓ Present | Full/Limit range |
| Function (L-Fn) Button | ✗ Not Present | |
| Zoom Lock Switch | ✗ Not Present | |
| Optical Image Stabilisation (OIS) | ✗ Not Present | |
| Weather Sealing | ✓ Present | Full WR series protection |
How-to Use Pentax smc DA* 300mm f/4 ED [IF] SDM
Welcome to the How-to section of the lens. In this Light & Composition University website, each page for a lens has a how-to section and a section for learning. The rings, switches and controls of each lens are placed differently between brands and models. The how-to section helps you operate the lens; however, if you are interested in learning photography, you also need to know what each control changes and why you would change it. Click the “Learn” or scroll down.
Learn & Master Photography with Pentax smc DA* 300mm f/4 ED [IF] SDM
For over a decade, we have been teaching photography following a university standard. No one does it better than us. We have a selection of courses, diplomas, graduate and post-graduate programs, as well as some of our best-selling university press publications, to guide you in the best possible way for your lens. Enroll in the fundamentals and then move to the genres you want to master.
Technical Specification
| Focal Length | 300mm (460mm equivalent on APS-C) |
| Aperture | f/4 to f/32 |
| Lens Construction | 8 elements in 6 groups |
| Min Focus Distance | 1.4m |
| Filter Thread | 77mm |
| Diaphragm Blades | 9 (rounded) |
| Focus Motor | SDM (Supersonic Direct-drive Motor) |
| Weather Sealing | Yes (7 seals) |
| Weight | 1070g |
| Dimensions | 83mm x 184mm |
