The Pentax smc Pentax-DA 18-135mm f/3.5-5.6 ED AL IF DC WR is a 18–135 mm zoom lens with a maximum aperture of f/3.5 for the Pentax K mount. Here are its field of view on different sensors, hyperfocal distances, Milky Way exposure limits and the cameras it fits.
Focal length
18–135 mm
Max aperture
f/3.5
Mount
Pentax K
Designed for
1.53× crop
Field of view by sensor
| Sensor | Diagonal angle of view | 35 mm equivalent |
|---|---|---|
| APS-C (1.5×) | 76.3° – 12.0° | 28–207 mm |
| Canon APS-C (1.6×) | 73.8° – 11.4° | 29–216 mm |
| Micro Four Thirds | 62.0° – 9.2° | 36–270 mm |
Hyperfocal distance
| Focal length | f/5.6 | f/8 | f/11 | f/16 |
|---|---|---|---|---|
| 18 mm | 3.0 m | 2.1 m | 1.5 m | 1.1 m |
| 135 mm | 166 m | 116 m | 85 m | 58 m |
Circle of confusion 0.020 mm (sensor size the lens is designed for).
Longest exposure for sharp stars
| Camera | NPF rule (wide open) | 500 rule |
|---|---|---|
| APS-C (24 MP) | 13.3 s @ f/3.5 | 18.2 s |
Cameras that fit (43)
- KMZ Zenit 122K
- KMZ Zenit 212K
- KMZ Zenit 312K
- KMZ Zenit KM
- Pentax 35mm film: full frame
- Pentax *ist DL2
- Pentax *ist DL
- Pentax *ist DS2
- Pentax *ist DS
- Pentax *ist D
- Pentax K-m
- Pentax K100D
- Pentax K100D Super
- Pentax K110D
- Pentax K10D
- Pentax K20D
- Pentax K-30
- Pentax K-50
- Pentax K-500
- Pentax K-7
- Pentax K-52010
- Pentax K-5 II2012
- Pentax K-5 IIs
- Pentax K-32013
- Pentax K-3 II2015
- Pentax K-3 III2021
- Pentax K-3 III Monochrome
- Pentax K2000
- Pentax K200D
- Pentax K-x
- Pentax K-r
- Pentax K-S2
- Pentax K-S1
- Pentax K-01
- Pentax KF2022
- Pentax KP2017
- Samsung GX10
- Samsung GX20
- Samsung GX-1S
- Samsung GX-1L
- Pentax K-12016
- Pentax K-1 II2018
- Pentax K-702016
Where to buy
B&H PhotoAmazonKEH (used)MPB (used)FAQ
What is the Pentax smc Pentax-DA 18-135mm f/3.5-5.6 ED AL IF DC WR equivalent to on APS-C?
It is designed for a 1.53× sensor, giving a full-frame equivalent of 28–207 mm.
Which cameras is the Pentax smc Pentax-DA 18-135mm f/3.5-5.6 ED AL IF DC WR compatible with?
It fits KMZ Zenit 122K, KMZ Zenit 212K, KMZ Zenit 312K, KMZ Zenit KM, Pentax 35mm film: full frame and more (see the full list above).