Pentax smc DA 40mm F2.8 Limited vs Tamron SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF)
Side-by-side comparison from our catalogue data. Better values are highlighted only where a clear difference exists.
Verdict at a glance
- Tamron SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF) goes wider (17mm vs 40mm).
- Tamron SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF) reaches further (50mm vs 40mm).
| Spec | smc DA 40mm F2.8 Limited | SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF) |
|---|---|---|
| Brand | Pentax | Tamron |
| Mount | Pentax K | Pentax K |
| Type | Prime | Zoom |
| Focal length | 40mm | 17-50mm (wider) |
| Max aperture | f/2.8 | f/2.8 |
| Format | aps-c | aps-c |
| Weight g | 90 | n/a |
| Filter mm | 49 | 67 |
| Length mm | 15.0 | n/a |
| Diameter mm | 63.0 | n/a |
| Min focus m | 0.4 | 0.27 (closer focusing) |
Pentax smc DA 40mm F2.8 Limited
A tiny metal-bodied pancake lens for Pentax APS-C bodies, weighing about 90 g. It is 15 mm long and takes 49mm filters.
Pros
- Very small at about 90 g
- Metal build
- Natural normal view on APS-C
- Sharp
Cons
- APS-C only
- f/2.8 is not fast
- No weather sealing
Tamron SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF)
A popular APS-C standard zoom with a constant f/2.8 aperture, much used on Pentax bodies with in-body stabilization. It has a 67mm filter thread and a minimum focus distance of 0.27 m.
Pros
- Constant f/2.8
- Compact 67mm filter size
- Constant aperture with in-body stabilization support
- Works with Pentax in-body stabilization
Cons
- APS-C only
- No weather sealing
- Plastic build