Minolta AF 70-210mm F4 (beercan) A-mount lens review by sooner

reviewer#2359 date: May-26-2007
sharpness: 4.5
color: 4
build: 5
distortion: 4
flare control: 3
overall: 4.1
tested on:
  • film camera:Film camera
  • APS-C: 6MP6 MP; 10MP10 MP; 12MP12 MP; 14MP14 MP; 16MP16 MP; 20MP20 MP; 24MP24 MP
  • full frame: 12MP12 MP; 24MP24 MP; 36MP36 MP; 42MP42 MP; 61MP61 MP
ownership:I own this lens
compared to:Minolta 75-300
Sigma 28-200D
price paid:
missing
positive:Sharp in center wide open and at f/8. O.K. in corner.
negative:A beast to lug around.
comment:I have tested this lens, and those listed above, using the Koren, 2003, (5mm) test charts to determine the resolution based on MTF-50. The following information is based on results from two of the sine-wave, test, strips; one horizontal near the center of the frame, and the other, diagonal, very close to the corner of the frame. The tests were made with a KM5D, hand held, image stabilization β€œon”, ISO 100, in bright sunlight so that the shutter speed was quick enough to satisfy the reciprocal of the focal length criterion. Results: (focal length/f-stop/lines per inch on an 8” x 12” print at center/ditto-at corner). (210/8/169/80), (210/4.0/165/66), (70/8/197/82), (70/4.0/137/53). My understanding of photo resolution quality is: >150 lpi=excellent, >110 lpi=very good, >80 lpi=good. I believe the corner results represent a pretty severe test since the test strip extended radially, and the region of interest was very near the corner. These results are further confirmation of the optical sharpness of this lens. The Sigma can match it (but, looses an f-stop at 200mm), is more compact and has a larger zoom range. More details on this and other lenses can be found at: http://www.geocities.com/royanddee/lens_test_results_mtf50.htm

rating summary

lens image
  • total reviews: 397
  • sharpness: 4.49
  • color: 4.78
  • build: 4.84
  • distortion: 4.56
  • flare control: 3.98
  • overall: 4.53
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