Pentax SMC-FA 50mm f/1.4 - Review / Lab Test Report
Lens Reviews -
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Special thanks to Markus Stamm for providing this lens!
It took a while but welcome to the first Pentax lens test here at Photozone.
As usual we'll start with a reference lens, typically 50mm primes and the
Pentax SMC FA 50mm f/1.4 qualifies here. Despite being one of the most
affordable Pentax branded lenses it is also the fastest one in the
current Pentax lens lineup. By now it is a fairly old lens and one of the
few remaining full format Pentax FA lenses. All Pentax tests will be performed
on the K10D - an APS-C DSLR where the FA 50mm has a field-of-view equivalent
to 75mm so it behaves like a moderate tele lens within this scope.
The build quality of the lens is very fine based on very good quality plastics
and a metal mount. The small rubberized focus ring operates very smooth. As you
can see above the lens extends a little bit towards closer focus distances.
The front element does not rotate so using a polarizer is no problem. The lens
has no internal AF motor and relies on a slotted drive screw operated by the camera.
As a result AF operation will generate a moderate degree of noise.
The AF speed is very decent on the K10D.
|Equiv. focal length||75 mm (full format equivalent)|
|Equiv. aperture||f/2.1 (full format equivalent, in terms of depth-of-field)|
|Optical construction||7 elements in 6 groups|
|Number of aperture blades||8?|
|min. focus distance||0.45 m (max. magnification ratio 1:6.7)|
|Dimensions||64 x 46 mm|
|Filter size||49 mm (non-rotating)|