Tamron SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF) vs Pentax smc Pentax-DA Fish-Eye 10-17mm f/3.5-4.5 ED IF

Side-by-side comparison from our catalogue data. Better values are highlighted only where a clear difference exists.

Tamron

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

Pentax

smc Pentax-DA Fish-Eye 10-17mm f/3.5-4.5 ED IF

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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 smc Pentax-DA Fish-Eye 10-17mm f/3.5-4.5 ED IF 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	SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF)	smc Pentax-DA Fish-Eye 10-17mm f/3.5-4.5 ED IF
Brand	Tamron	Pentax
Mount	Pentax K	Pentax K
Type	Zoom	Fisheye
Focal length	17-50mm	10-17mm (wider)
Max aperture	f/2.8 (faster)	f/3.5
Released	n/a	2006
Format	aps-c	aps-c
Filter mm	67	n/a
Min focus m	0.27	0.14 (closer focusing)
Blades	n/a	6
Groups	n/a	8
Af motor	n/a	screw-drive
Elements	n/a	10
Weight g	n/a	320
Length mm	n/a	71.0
Diameter mm	n/a	69.0
Max magnification	n/a	0.39

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

Pentax smc Pentax-DA Fish-Eye 10-17mm f/3.5-4.5 ED IF

This 10-17mm f/3.5-4.5 fisheye lens from Pentax fits Pentax K mount cameras, with extra-low dispersion glass. It suits dramatic perspectives, astrophotography and creative wide-field work.

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