Two 50mm f/2 Lenses for Your Pentax K-Mount Film SLR
If you are looking for an affordable, fast prime for your Pentax K-mount 35mm film SLR, you will likely come across two similar options: the SMC Pentax-M 50mm f/2 and the standard Pentax 50mm f/2. Both are used, both share the same focal length and maximum aperture, and both fit the Pentax K mount. But small differences in design and condition can influence which one is right for your kit.
This comparison focuses on what the CameraMall listings actually confirm, so you can make a practical decision without assuming details that are not supplied.
What the Listings Confirm
- USED SMC Pentax-M 50mm f/2 (#4130629CM): This is a used SMC Pentax-M 50mm f/2 lens, offered by CameraMall under the Pentax brand. It is a prime 50mm lens associated with the Pentax K mount, making it relevant to 35mm SLR film camera setups. The SMC Pentax-M series is known for its multi-coating and compact build. This listing confirms the K mount and film SLR suitability, but does not specify included accessories or cosmetic condition.
USED SMC Pentax-M 50mm f/2 (#4130629CM) - USED Pentax 50mm f/2 (#4248748CM): This is a used Pentax 50mm f/2 lens offered by CameraMall. It is a Pentax K mount lens, listed under used lenses for 35mm SLR film cameras. The item is identified by the reference number #4248748CM. The standard Pentax 50mm f/2 is a simpler, often earlier design. The listing confirms basic specs but does not detail lens coating or included caps.
USED Pentax 50mm f/2 (#4248748CM)
SMC Pentax-M 50mm f/2 vs Pentax 50mm f/2: Key Differences
Both lenses are 50mm f/2 primes for Pentax K mount 35mm SLR film cameras. The main differences come from their design era and the specific item condition.
- Lens coating and design: The SMC Pentax-M features Super Multi Coating (SMC), which generally improves contrast and reduces flare. The standard Pentax 50mm f/2 may have a simpler coating or no multi-coating. The listings do not confirm the coating type for the standard lens, so treat this as a possible advantage for the SMC version.
- Build and size: The SMC Pentax-M is typically more compact, while the standard Pentax 50mm f/2 is often slightly larger. Both are manual focus and manual aperture. The listings do not provide dimensions or weight, so rely on general knowledge of the Pentax-M series.
- Price and value: The used SMC Pentax-M 50mm f/2 is listed at USD 35.49 (catalog comparison price USD 49.99). The used Pentax 50mm f/2 is listed at USD 30.35 (catalog comparison price USD 45.99). The SMC version costs about $5 more, which may be worthwhile if you prioritize coating quality.
What to Check Before You Buy
Since both lenses are used and the listings do not include detailed condition reports, you should review the provided images carefully. Look for scratches, haze, fungus, and smooth aperture ring operation. Neither listing confirms the presence of front or rear caps, so check if they are included.
Also, confirm that the Pentax K mount is compatible with your specific film SLR body. Most Pentax K-mount cameras will accept both lenses, but some early K-mount bodies may have minor differences in aperture coupling. The listings do not provide this detail, so verify with your camera's manual if needed.
Which Lens Should You Choose?
Choose the SMC Pentax-M 50mm f/2 if you want the potential benefits of multi-coating and a more compact lens, and you are willing to pay a small premium. Choose the standard Pentax 50mm f/2 if you want a straightforward, slightly cheaper option and are less concerned about coating technology.
In either case, the condition of the specific used lens you receive will matter more than the theoretical differences. Both are capable of excellent results on 35mm film when in good shape.
