Micro Four Thirds Focal Reducer Shootout

Started Feb 20, 2014 | Discussions thread
dougjgreen1 Veteran Member • Posts: 4,068
Re: I'm not questioning your testing methodology.....

brian wrote:

Like I said, there was no cherry picking. The Speed Booster is my one and only personal sample. I've had it since last summer, and it was given to me - I didn't buy it. It was selected at random from the normal production run. I purchased all the other focal reducers online, just one sample of each.

The primary result of sample variation is uneven corner performance due to tilted and/or decentered lens elements. This is why I took the trouble to show all four corners and both sides in my 100% crops. This ensures that you don't just show the worst corner or the best corner etc. This helps to prevent sample variation from degrading the value of the test.

Thank you.  I was simply  asking how the test subjects were obtained.  That's the info I was looking for.

 dougjgreen1's gear list:dougjgreen1's gear list
Olympus Stylus XZ-10 Nikon 1 V2 Olympus PEN E-P5 Olympus E-M1 Olympus E-PL7 +17 more
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