oly 12 2 versus oly 12-40 2.8?

Started Mar 24, 2014 | Discussions thread
Guy Parsons
Guy Parsons Forum Pro • Posts: 29,866
Re: oly 12 2 versus oly 12-40 2.8?

Drplusplus wrote:

Guy Parsons wrote:

# 2 wins. Check out the LensTip resolution charts for both lenses (12-40mm and 12mm ) and see that the 12-40mm is seemingly perfect at 12mm wide open, the 12/2 does not get there until f/4.0~5.6

LensTip shows the 12-40 to have an interesting characteristic of decreasing in sharpness as you stop down,

That demonstrates that the lens is near perfect at wide open and decreases due to the usual diffraction as it is stopped down.

instead of (as lenses frequently do) improving up to about f/4-f/5.6.

That demonstrates that lens imperfections rule at the largest aperture and only reach a compromise between imperfections and diffraction around 2 stops down.

If we believe the SLRGear blur indexes, the 12 looks to be ahead of the 12-40 in the aperture range f/4-f/11. So people may want to consider what aperture they expect to use most frequently.

It's all a bit academic as only the people who waste their lives pixel peeping or that they print regularly to 16 x 20 inch and view them too closely will ever see the differences.

Opinions on the optical quality of the 12 are all over the map, and some users report having a bad copy. I wonder if LensTip's results may have come from such a copy, since their report is far less enthusiastic than what LensRental reported.

I see it that the 12mm lens is only 12mm, while the 12-40mm is 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm and 40mm and all at f/2.8 if needed.

Just for fun I used ExposurePlot to analyse the last week or two where I have used only the 12-40mm, about 120 shots analysed......

Sure, there's a big bump at 12mm but I was doing more experiments with 12mm panoramas at the time, the rest get used but the hump around 15,16,17mm again proves to me that I "see" things best at around that 35mm equivalent, which was my most used prime in film days.

So if I had to live with only one prime it would be the 17mm as the first buy, but thanks to the lens gods on Mt. Olympus now I don't have to go the expensive and cumbersome prime route.

Regards.... Guy

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