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Old Jan 26, 2008, 5:55 PM   #1
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I took some shots with the Promaster/Phoenis/Vivitar/Cosina/etc 100-400 (on the K100D (default settings, green mode) and also the 70/100-300 Tamron macrozooms (70-300 on K100D and 28-300 on K10D) to see how comparable they might be. The object was not to compare images directly out of the camera, but after similar minimal processing (brightness, contrast, sharpness) - not what the lenses could do, but what I could (or would)do with them (which is the bottom line). All hand held (but braceed against a door frame)

1) Promaster @ 400 (=600) 1/750" f9.5 ISO 200
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Old Jan 26, 2008, 5:57 PM   #2
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2) Promaster @ 400 (=600) 1/250" f9.5 ISO 200 (Cropped, but full sized; takenat minimum focusing distance)
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Old Jan 26, 2008, 5:58 PM   #3
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3) Promaster @ 300 (=450) 1/500" f9.5 ISO 200
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Old Jan 26, 2008, 6:00 PM   #4
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4) Tamron 70-300 @ 300 (=450) 1/350" f8 ISO 200
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Old Jan 26, 2008, 6:02 PM   #5
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5) Tamron 28-300 @ 300 (=450) 1/180" f6.7 ISO 100
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Old Jan 26, 2008, 6:03 PM   #6
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6) Promaster @ 400 (=600) 1/750" f9.5 ISO 100
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Old Jan 26, 2008, 6:05 PM   #7
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7) Tamron 70-300 @ 260 + Sigma 1.4 TC @ =364 (=546) 1/500" f5.6 ISO 200
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Old Jan 26, 2008, 6:06 PM   #8
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8- Tamron 28-300 @ 300 + Sigma 1.4 TC= 420 (=630) 1/250" f6.7 ISO 100
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Old Jan 26, 2008, 8:40 PM   #9
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these all seem to compare to each other very well as far as IQ. what i'm more interested in is IQ shooting wide open.

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Old Jan 26, 2008, 11:00 PM   #10
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This was not intended to be a Modern Photography type of lens evaluation. It was just a quick series to see if the Promaster was worth keeping after I received it, and I concluded it was. I was most surprised that it was useful as a telemacro - it has not been presented as such before. Edge sharpness (as much as one can tell without a lab bench test) seems good, and there is no gross pincushioning or barrel distortion. I didn'tcompare the shorter end of the range because I was most interested in use at the longer end. My overall impressions (there were additionsl images, too) are that the Tamron 70-300has an edgeexcept at 300 + the TC when matched against the straight 400. I didn't take them with the intention of posting them, but thought it worthwhile after seeing the results, given the level of interest that has been shownin the lens.
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