Do lenses have subjective qualities not shown in any technical specification?

Started Mar 31, 2013 | Discussions thread
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Re: Do lenses have subjective qualities not shown in any technical specification?
In reply to Alex Notpro, Apr 1, 2013

Yes. Lenses have important and decisive characteristics behind specs. Most common annoing flaws are:

1. Optical.

- flares at some conditions;

- looses contrast contra-light;

- complex distortions at wide end; (i.e. not straigt barrel or picussion)

- while most lenses washes far plane smoothly, only few actually renders 'near focus plane bokeh' or as I call it "focus plane transitions". It is most common flaw and reason that some lens "draws" picture, but some not.

In reality is shows as a very thin focus plane sharpness surrounded by harsh transitions. for example of such 'bokeh' picture ruined by 55-200vr, but some defective lenses make it much worse.

This sample from 55-200vr shows bad and intrusive bokeh

2. Mechanical.

- focus ring path too short;

- focus ring rotates with autofocus;

- change lenght while zoom or focus;

- wobbles and clicks inside;

- "eyepiece blow" while zooming.

3. Handle.

- Too thick for comfortable handling;

- Sigmas zoom rotates contra direction for Nikon.

- some zooms distribute weight to far end while zooming.

- Feeling of plastic and metal finish.

Optical qualities often meet in lens-to lens variations, while mechanical and handle issues are common for all pieces of same model.

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