P-TTL Test Images

EV compensation

Next we illustrate the effect of exposure compensation (rows 1 through 4) and of varying the ISO (rows 4 and 5).

Setup:

Pentax K-3 in P exposure mode
Unprocessed JPGs (except for scaling)
Autofocus with center focus point
smc Pentax-A, -F, and -FA 50mm F1.4 lenses
AF 360 FGZ II flash mounted on camera
Direct flash, zoom head at 48 mm matching the lenses

Click any thumbnail to start browsing larger images.

	FA50	F50	A50
1	FA50-P=std=dir=ctr=vf=i0100=ev+1 1/90sec F5.6 ISO 100 EVC 1.0	F50-P=std=dir=ctr=vf=i0100=ev+1 1/90sec F4.0 ISO 100 EVC 1.0	A50-P=std=dir=ctr=vf=i0100=ev+1 1/125sec F2.8 ISO 100 EVC 1.0
2	FA50-P=std=dir=ctr=vf=i0100=ev-1 1/90sec F4.0 ISO 100 EVC -1.0	F50-P=std=dir=ctr=vf=i0100=ev-1 1/90sec F4.0 ISO 100 EVC -1.0	A50-P=std=dir=ctr=vf=i0100=ev-1 1/125sec F2.8 ISO 100 EVC -1.0
3	FA50-P=std=dir=ctr=vf=i0100=ev-2 1/90sec F4.0 ISO 100 EVC -2.0	F50-P=std=dir=ctr=vf=i0100=ev-2 1/90sec F4.0 ISO 100 EVC -2.0	A50-P=std=dir=ctr=vf=i0100=ev-2 1/125sec F2.8 ISO 100 EVC -2.0
4	FA50-P=std=dir=ctr=vf=i0100=ev0 1/90sec F4.5 ISO 100	F50-P=std=dir=ctr=vf=i0100=ev0 1/90sec F4.5 ISO 100	A50-P=std=dir=ctr=vf=i0100=ev0 1/125sec F2.8 ISO 100
5	FA50-P=std=dir=ctr=vf=i0400=ev0 1/90sec F9.5 ISO 400	F50-P=std=dir=ctr=vf=i0400=ev0 1/90sec F8.0 ISO 400	A50-P=std=dir=ctr=vf=i0400=ev0 1/125sec F4.0 ISO 400

Our findings are:

EV compensation works as expected
There is no significant difference between ISO 100 and 400 regarding exposure
The A-series lens exposes on the bright side
The FA and F lenses always underexpose some
The K-3 always picks a larger aperture with the A lens than with the F/FA lenses in P mode.

FA vs F vs A-series lenses

Next: Live View vs. View Finder

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