Compare lenses

Pentax HD D FA 28-105mm f/3.5-5.6 ED DC WR vs Pentax smc DA 18-135mm f/3.5-5.6 ED AL [IF] DC WR

The Pentax HD D FA 28-105mm f/3.5-5.6 ED DC WR and the Pentax smc DA 18-135mm f/3.5-5.6 ED AL [IF] DC WR side by side, computed from this guide's catalogue.

Which to pick

Pick the Pentax HD D FA 28-105mm f/3.5-5.6 ED DC WR if you want coverage of full frame, so it suits the larger-sensor bodies too. Pick the Pentax smc DA 18-135mm f/3.5-5.6 ED AL [IF] DC WR if you want more reach (to 202mm equivalent) and a design for APS-C, which usually means smaller and lighter.

Still torn? Ask the guide about the Pentax HD D FA 28-105mm f/3.5-5.6 ED DC WR and the Pentax smc DA 18-135mm f/3.5-5.6 ED AL [IF] DC WR

Specs side by side

Rows that differ are in full colour; the better value is marked where one is better by any measure.
Spec	Pentax HD D FA 28-105mm f/3.5-5.6 ED DC WR	Pentax smc DA 18-135mm f/3.5-5.6 ED AL [IF] DC WR
Maker	Pentax	Pentax
Focal length	28-105mm (zoom)	18-135mm (zoom)
Full-frame equivalent	28-105mm	27-202mm on APS-C
Maximum aperture	f/3.5-5.6	f/3.5-5.6
Made for	Full frame	APS-C
Mounts	Pentax K	Pentax K
Stabilised	no	no
Autofocus	yes	yes
Zoom range	3.8×	7.5×more range
Weight	not listed	405 g
Cameras it fits	20 in this guide	20 in this guide

Focal range, in full-frame terms

Pentax HD D FA 28-105mm f/3.5-5.6 ED DC WR: 28-105mm.

Pentax smc DA 18-135mm f/3.5-5.6 ED AL [IF] DC WR: 18-135mm on APS-C, like 27-202mm.

Aperture

Pentax HD D FA 28-105mm f/3.5-5.6 ED DC WR: f/3.5 wide open.

Pentax smc DA 18-135mm f/3.5-5.6 ED AL [IF] DC WR: f/3.5 wide open.

Each opening drawn to scale against f/1.4: a smaller f-number lets in more light and blurs the background more.

Field of view

How wide each sees, at each end, on the sensor it was made for.

Cameras they fit

20 cameras in this guide take both, so either works on the same body.