P-TTL Test Images

Flash Modes

Below we compare the following flash modes:

Slow sync (row 1)
High speed sync (rows 2 to 6) (The A-lens test was done with another scene than F/FA)
Standard sync in M exposure mode (row 7)
Standard sync in P exposure mode (row 8)
Trailing curtain sync in P exposure mode (row 9)

Setup:

Pentax K-3
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-Av=slow=dir=ctr=vf 0.7sec F5.6 ISO 200	F50-Av=slow=dir=ctr=vf 1/6sec F2.8 ISO 200	A50-Av=slow=dir=ctr=vf 1/180sec F2.8 ISO 200
2	FA50-M=hss=dir=ctr=vf=F028=s0250 1/250sec F2.8 ISO 400	F50-M=hss=dir=ctr=vf=F028=s0250 1/250sec F2.8 ISO 400
3	FA50-M=hss=dir=ctr=vf=F028=s0500 1/500sec F2.8 ISO 400	F50-M=hss=dir=ctr=vf=F028=s0500 1/500sec F2.8 ISO 400
4	FA50-M=hss=dir=ctr=vf=F028=s1000 1/1000sec F2.8 ISO 400	F50-M=hss=dir=ctr=vf=F028=s1000 1/1000sec F2.8 ISO 400
5	FA50-M=hss=dir=ctr=vf=F028=s2000 1/2000sec F2.8 ISO 400	F50-M=hss=dir=ctr=vf=F028=s2000 1/2000sec F2.8 ISO 400
6			A50-M=hss=dir=ctr=vf=F056=s1500 1/1500sec F5.6 ISO 100
7	FA50-M=std=dir=ctr=vf=F028=s0180 1/180sec F2.8 ISO 400	F50-M=std=dir=ctr=vf=F028=s0180 1/180sec F2.8 ISO 400	A50-M=std=dir=ctr=vf=F028=s0180 1/180sec F2.8 ISO 400
8	FA50-P=std=dir=ctr=vf 1/90sec F5.6 ISO 200	F50-P=std=dir=ctr=vf 1/90sec F6.7 ISO 200	A50-P=std=dir=ctr=vf 1/125sec F2.8 ISO 200
9	FA50-P=trail=dir=ctr=vf 1sec F6.7 ISO 200	F50-P=trail=dir=ctr=vf 1sec F6.7 ISO 200	A50-P=trail=dir=ctr=vf 1/6sec F2.8 ISO 200

Observations:

F and FA lenses perform virtually identical
F and FA images slightly underexposed
The A lens tends towards overexposure with a (very) few blown highlights
Flash zoom must be set manually with A-series lenses
HSS provides darker results as the shutter speed increases

Bounce Flash

Next: P-TTL with Various Lenses and Focal Lengths

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