Minolta AF 70-210mm F4 (beercan) A-mount lens review by sooner
 sooner#2359 date: May-26-2007 | |
|---|---|
| sharpness: 4.5 color: 4 build: 5 distortion: 4 flare control: 3 overall: 4.1 | tested on:
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| 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 “on”, 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 |
; 10MPrating summary
- total reviews: 397
- sharpness: 4.49
- color: 4.78
- build: 4.84
- distortion: 4.56
- flare control: 3.98
- overall: 4.53