[LRflex] Re: IMG: My lens-test window
- From: Richard Ward <ilovaussiesheps@xxxxxxxxx>
- To: leicareflex@xxxxxxxxxxxxx
- Date: Thu, 11 Feb 2010 19:19:27 -0800 (PST)
Hi Doug,
I would like to extend my compliments to you what I would consider a very
sound methodology and subject(s) for evaluating your lenses with shots of a
single scene. It also lends itself to repeatability of evaluations longitudally
across time. Very nice. Very very nice. The 'dirty window' ought to be
adressed, you don't want a couple of dusty days in a row to combine with a
wimpy rain shower to give you a grubby window and give a lens a 'bowser' label
when it really isn't. :-)
Speaking as someone who loves his own 20D, I positively shiver at the
thought of using ISO800 to evaluate a lens. "Dear God Man, Have You Lost Your
Mind?!?!" is a movie line which is repeatedly going thru my mind at this
moment. :-) (Wish I could remember from which movie!) Douglas, I definitely use
800 and faster iso's myself and I do so surprisingly often because of my
available light shooting style. So, I don't consider it at all an unusable
setting, but I use it knowing I've given up an awful lot compared to what the
20D gives at iso100.
Richard in Michigan
________________________________
Be Nice To Your Children!
They Will Be Choosing
Your Nursing Home :-)
________________________________
________________________________
From: Douglas Sharp <douglas.sharp@xxxxxx>
To: LeicaReflex <LeicaReflex@xxxxxxxxxxxxx>; LUG <lug@xxxxxxxxxxxxxxx>
Sent: Thu, February 11, 2010 5:20:59 PM
Subject: [LRflex] IMG: My lens-test window
Who needs lens-test cards? :-)
A shot through my office window today:
http://gallery.leica-users.org/d/203014-1/_MG_0702.jpg
Car number plate on the left = edge sharpness
A brick wall in the background = centre sharpness, contrast
Twigs and branches = chromatic aberration, fringing, sharpness and contrast
Snow = white balance
Shield on lamp-post = right-edge sharpness
Cyclistâ??s face = flesh tones
The whole shot = depth of focus (I focused on the plate of the VW Golf
in the middle)
I think this Soligor 35-80 zoom might be a keeper, it seems to work well
enough at f5.6 and 80 mm, light and compact too :-)
A similar test with a Tokina 35-105 proved that the lens barks :-(
Technical data: shot with a Canon 20D, 1/320, ISO equivalent 800 through
a slightly grubby windowpane
All I need now is some sun to try it out again in decent weather at ISO
100.
BTW: winter,snow and dull weather have now been with us here in Hannover
since the 18th of December - and I'm gradually getting sick of it.
Cheers
Douglas
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