Pentax HD Pentax-DA 10-17mm F3.5-4.5 ED fisheye 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.

Pentax

HD Pentax-DA 10-17mm F3.5-4.5 ED fisheye

Tamron

SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF)

Verdict at a glance

Tamron SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF) is faster by 0.6 stops (f/2.8 vs f/3.5), letting in more light.
Pentax HD Pentax-DA 10-17mm F3.5-4.5 ED fisheye goes wider (10mm vs 17mm).
Tamron SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF) reaches further (50mm vs 17mm).

Specification comparison
Spec	HD Pentax-DA 10-17mm F3.5-4.5 ED fisheye	SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF)
Brand	Pentax	Tamron
Mount	Pentax K	Pentax K
Type	Wide Zoom	Zoom
Focal length	10-17mm (wider)	17-50mm
Max aperture	f/3.5	f/2.8 (faster)
Format	aps-c	aps-c
Weight g	317	n/a
Length mm	70.0	n/a
Diameter mm	68.0	n/a
Min focus m	0.14 (closer focusing)	0.27
Filter mm	n/a	67

Pentax HD Pentax-DA 10-17mm F3.5-4.5 ED fisheye

A fisheye zoom for Pentax APS-C bodies. It weighs about 317 g and focuses as close as 0.14 m.

Pros

Zoom flexibility
Close focus 0.14 m
HD coating
Compact

Cons

APS-C only
Strong distortion
No front filters

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

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