Help judging performance of my FE55z, FE35f2.8z horizon/infinity

Started Jul 5, 2016 | Questions thread
l_d_allan
l_d_allan Veteran Member • Posts: 5,087
Re: Help judging performance of my FE55z, FE35f2.8z horizon/infinity

holin wrote:

As for the testing method, I'd test with a brick wall, carefully aligned,

Agree (and there are also more than a few other considerations to be aware of besides alignment).

A real issue with distant targets is "atmospherics" ... haze/pollution/humidity, wind, etc.

Objects at "near infinity equivalent" like 1000x to 10,000x focal length are often not all that flat, which can throw off evaluation.

or try to find slightly flatter infinity subject - so that almost everything is far away in the photo. Now you only have very thin corner to corner line of detail (buildings) from which to judge sharpness. Trees won't do, especially when it's windy.

I think with enough experience doing valid "good copy vs bad copy" testing with real attention to detail, testing a newly purchased lens can eventually get to be pretty quick and simple.

However, my impression from reading way too many q/c related posts on DPR is that there is a LOT of invalid testing being done.

And then ... as much or more flawed evaluation of the test captures.

Am I the only one who has found there is a definite learning curve involved?

A. Pope: A little learning is a dangerous thing ; Drink deep, or taste not the Pierian spring :

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