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

Started Mar 31, 2013 | Discussions thread
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krikman Regular Member • Posts: 402
Re: Do lenses have subjective qualities not shown in any technical specification?
1

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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