Just for fun, I attempted a simple test of 3 lens to test sharpness and bokeh at the 135mm focal range. Here goes my findings.
Original photo
135mm f2.8 prime @ f2.8 (Cropped)
135mm f2.8 prime @ f4.5 (Cropped)
28-135mm zoom @ f4.5 (Cropped)
Beercan 70-210 @f4.5
Bokeh-wise, the 135mm@f2.8 is of course the nicest being the most wide open. At f4.5 for this test however, I cannot seem to find big differences between the 3 lens.
Sharpness wise, as shown above, the 135mm @f4.5 is the sharpest, followed by 135mm @f2.8, beercan @f4.5, and worst is 28-135mm@f4.5.
Focusing distance-wise, the 135mm and beercan can focus closer (alomost same distance) than the 28-135mm zoom.
Please feel free to comment on the results or inaccuracies of the test if any. More photos in my Flickr site.
Original photo
135mm f2.8 prime @ f2.8 (Cropped)
135mm f2.8 prime @ f4.5 (Cropped)
28-135mm zoom @ f4.5 (Cropped)
Beercan 70-210 @f4.5
Bokeh-wise, the 135mm@f2.8 is of course the nicest being the most wide open. At f4.5 for this test however, I cannot seem to find big differences between the 3 lens.
Sharpness wise, as shown above, the 135mm @f4.5 is the sharpest, followed by 135mm @f2.8, beercan @f4.5, and worst is 28-135mm@f4.5.
Focusing distance-wise, the 135mm and beercan can focus closer (alomost same distance) than the 28-135mm zoom.
Please feel free to comment on the results or inaccuracies of the test if any. More photos in my Flickr site.