Resolution test, between crop (18MP) and fullframe (12.8MP)

Started Mar 12, 2013 | Discussions thread
qianp2k Forum Pro • Posts: 10,350
Re: Resolution test, between crop (18MP) and fullframe (12.8MP)

joger wrote:

f/11 does make not much senesce look also here

I'd rather suggest f/4.0 for crop and f/5.6 for ff - which is btw for most fast lenses the sweetspot

Agreed that confirmed in DXOMark test of this lens on 5D and 7D.  Check Measurements | Sharpness | FieldMap, it also suggests F/5.6 has best sharpness on 5D and F/4 on 7D.  They are very close as DXOMark test result shows.

I will do a similar test in this weekend on this suggestion.  It seems will be raining in Saturday and will look into Sunday's window.  My test will be on tripod, MLU with 2-sec timer, MF (try best on 5D thru VF), remote release with cable, against remote subject with lots of textual details.

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