Upload & Sell: Off
HOWEVER, last month I acquired a 105mm f/2.8 ais micro, and while at close up range I had no surprise confirming the micro lens to be better (since it is made for that) than 105/2.5 + tubes, I was more than surprised to see also that at infinity the micro had better borders than the 105/2.5 ais.
General view of test scenario - 105mmf2.5ais at f5.6 (shadowed areas are the tested ones):
Test scene general view 105mmf2.5ais at f5.6 by labecoaves, on Flickr
Darkened areas were the cropped ones for the comparisons below.
All shots with a D3 + tripod + MC30 cable = 5s of MLU. Focusing for both was optimized through Live View. The focus was at the centre (white house).
Below itt will be a torture - the several cropped areas - sorry for that.
There we go:
CENTRE at f2.8
CENTRE at f2.8 by labecoaves, on Flickr
CENTRE at f/5.6
CENTRE at f5.6 by labecoaves, on Flickr
TOP LEFT at f2.8
TOP LEFT at f2.8 by labecoaves, on Flickr
TOP LEFT at f5.6
TOP LEFT at f5.6 by labecoaves, on Flickr
TOP RIGHT at f2.8
TOP RIGHT at f2.8 by labecoaves, on Flickr
TOP RIGHT at f5.6
TOP RIGHT at f5.6 by labecoaves, on Flickr
BOTTOM LEFT at f2.8
BOTTOM LEFT at f2.8 by labecoaves, on Flickr
BOTTOM LEFT at f5.6
BOTTOM LEFT at f5.6 by labecoaves, on Flickr
BOTTOM RIGHT at f2.8
BOTTOM RIGHT at f2.8 by labecoaves, on Flickr
BOTTOM RIGHT at f5.6
BOTTOM RIGHT at f5.6 by labecoaves, on Flickr
This is it. For me both lenses are similar at infinity and at f/8-f-16(not shown here), but the micro version is better at f/2.8-4 and slighly better at f/5.6 (mostly at borders).
These results must be considered very cautiously , since my N = 1 for both lenses using just a N= 1 body (D3).
Anyway you have two excellent choices, no chance to go wrong:
105/2.5 - classic lens, good all around performance, for landscapes even performance between centre-border at f8-f11; cheaper and lighter.
105/2.8 micro - beautifully built, very good allround performance, in your case with the "bonus" of good macro at 1:2 without tubes, surprisingly good performance at infinity.