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
1

JimKasson wrote:

The format in which I find it easiest to do these tests is to export the images as full-sized TIFFs from your raw developers to Photoshop as separate layers. Then label the layers with the settings, write the file out as a PSD, host it on Dropbox or something similar, and post a link here.

I'm curious what kind of info you would include in the "separate layers".

My observation is that the EXIF has most of the relevant info (EFCS?, temp?, IBIS?). Would the layer have details about non-EXIF such as tripod usage? How much care taken for issues such as atmospherics?

I really try to stay away from TIFF's unless there are compelling reasons .. and I have TB's of inexpensive storage. I get impatient with the sluggishness of huge .tif files.

My experience is that a .tif is about 5x larger than a cRAW, at least for my a7Rii. I almost always use uRAW and then DngConverter to get .dng's with "pragmatic lossless compression" ... so a uRAW goes from 85 MB to 45 MB. But then it would bloat to about 230 MB for the .tif.

Then anybody doing the reviewing can just click on the layer visibility icons to directly compare any images in the stack.

The downside of this is that it means that everybody involved has to have Ps, though.

Unless I'm unaware of lots of info that should be in the "separate layers", I'd speculate that a simple uRAW or cRAW or .dng ... WITH more or less detailed annotations about exceptions for standard practice... might suffice, and also avoid the need for PS.

I looked at your raws. They look fine to me.

I would very much appreciate learning how you went about evaluating the OP's raws.

Perhaps you could "think out loud with your keyboard" to explain what you look for, what you observed with the OP's raws, and what it meant.

Have you done something like that as a TLW blog article?

Since being in the market for pricey Sony lenses with their earned rep for so-so QC, I've done perhaps more than my share of brick wall testing. However, I have my doubts I really know how to evaluate the results of this tedious and error-prone "good copy vs bad copy" testing.

I never got close to getting valid, objective MtfMapper numbers, so it all seems rather subjective "by eyeball".

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