Julian,
I'm now favoring the 20/2.8 because my informal tests (consisting of
getting 8x12s made from identical pictures made with both lenses) show it
to have higher resolution at f/8.
Pierre
At 12:29 3/4/2001 -0500, you wrote:
>Hi Pierre,
>
>I went shopping, and ...
>came home with a Canon EF 20-35mm f/3.5-4.5 zoom and matching
>EW 83 II hood. My intended use is mainly travel, but also for nature
>scenics and nature closeups.
>
>Here's MY rationalization. I hope it does not have to be logical) :-)
>
>Common negative points
>1) 5 bladed diaphragm. Pentagonal bokeh, ugghh...
>2) Hood not included
>3) Hey, I thought there were 20 million EF lenses ever made.
> So, how come there are so few used EF 20 and EF 20-35's?
> Did Canon make 18 million 28-80 IV (Photodo 2.2)?
>
>EF 20-35mm
>1) Zoom is more versatile (e.g. framing slides and when travelling)
>2) Lighter (340g vs 405g)
>3) Identical Photodo rating (3.4) as the 20mm prime lens
>4) Photodo measured focal length 20-35mm (unlike some other lenses)
>5) Cheaper
>
>EF 20mm
>1) Focuses closer (25cm vs 34cm)
>2) 72mm filter mount
>3) Less linear distortion (photodo -2.33% vs -4.55%)
>
>The zooming aspect became relatively important, especially for
>travelling in Europe with two young children.
>
>I wanted to discuss just two issues: the close-focussing, and filter
>mount diameter.
>
>Close focussing is important, but the DOF calculator
>http://www.photozone.de/depth.htm
>reports the hyperfocal distance for a 20mm lens at f/16 is 1 meter.
>
>Does this mean that "infinite DOF" scenics need to be composed so
>that "everything" lies between 0.5m to infinity?
>
>Does this mean that focussing closer blur distant objects?
>
>
>Another reason for choosing the zoom is the ability to crop the
>unwanted detail out of the picture. Details like my shoes, tripod
>legs, camera bag, power lines, sun, etc :-)
>
>The filter situation bothered me more. A good solution would be to
>have drop-in rear filters, like the EF 17-35 L. Another method is
>to forego filters altogether and buy a rangefinder with a Zeiss
>16mm Hologon or 21mm Biogon or even a Voigtländer 12mm or 15mm
>Heliar. Those solutions are not in my current budget :-)
>
>In order to use my existing 72mm filters, I could either buy the
>EF 20mm or search for a used discontinued (non USM) EF 20-35 L in
>good condition. (KEH has some battered ones on their website).
>
>However, since I also have Cokin P filters (83 to 85mm in size), I was
>equally happy to use the Cokin CPOL and Grad NDs. There are many reports
>of vignetting with Cokin P and super-wide angle lenses in the archives.
>
>Would it help to just hold the filters by hand in front of the lens?
>
>Or use a rubber band to secure the Cokin P holder to the lens hood
>bayonet mount?
>
>Or even surgically modify a Cokin P holder, using WJM's idea of a hot
>soldering iron :-)
>
>Bring on the flames :-)
>
>Cheers
>Julian Loke
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