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DEPTH OF FIELD PREVIEW
Your camera enables you to preview just what will and what will not
be sharp in your pictures. By depressing the preview lever near the
lens mount, you can close the lens down to whatever aperture you
have set. You can then preview how much sharpness you will get in
your picture by examining the picture area on the ground glass. After
previewing your picture, if you release the preview lever, the lens will
return to full aperture for focusing. You cannot, however, preview
the depth of field with your camera set in the Programmed AE mode.
Note: Taking pictures with the preview lever depressed will result in
incorrectly exposed pictures.
Depth-of-field Table: SMC Pentax A 50mm Lens
unit-meter
Dirt*r>c* ten t
1/1.4
m
m&
m
f/S6
m
»/11
f/16
f/22
0.448
0 446
0 445
0.443
0.440
0 436
—
'
0455
0.457
'
0 460
- 0 465
- 0.471
- 0 481
' 0.493
0.5m
0.497
-
0 503
0 495
-
0 505
0.494
-
0 507
0491
0.509
0 487
-
0.513
0 482
- 0 519
0.476
- 0.527
0 466
- 0 540
0.454
0.6m
0 595
-
0.605
0 593
-
0607
0 590
-
0610
0 586
0 615
0 581
-
0621
0.573
- 0 630
0 564
- 0642
0 549
- 0 663
0.532
0 Bm
0.791
-
0.810
0 787
-
0.814
0 781
~
0.820
0 774
0 828
D 764
-
0 840
0 749
- 0 859
0.732
- 0 883
0 705
~ 0 927
0675
10n
0 985
-
1.016
0 978
-
1.023
0.970
-
1.032
0 958
1 046
0.942
_
-
1.066
0.919
- 1 098
0 892
- 1.140
0.851
- 1.218
0 806
1,5m
I 464
-
1538
i 449
-
1 555
1.430
-
1.578
1.402
1.613
1.366
-
1.664
1.316
- 1.746
1.259_
- 1.861
1.1 74 _
- 2.093
1.086
- 2 462
20
m
1.935
-
2070
1 908
-
2.101
1.874
-
2144
1 825
2.213
1.764
-
2.312
1 679
_ - 2.478
1.584
- 2 724
1.449
_- 3.266
1.314
- 4 298
3.0m
2.853
-
3 164
2 794
-
3.239
2.719
-
3 346
2.615
3 521
2 487
-
3 785
2.318
- 4 265
2 137
- 5.073
1 892
- 7 426
1 665
-16 883
10.0m
8.488
- 12.171
T973
- 13.421
7.375
- 15.552
6631
20 422
5846
~ 35. Id
4 966
4.181
3.313
2^55
"
56 370
38.772
27.707
19.40a
13.876
9 726
7.066
4.885
3.565^
• 54
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