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Re: [OM] IMG: Cirrus in B&W

Subject: Re: [OM] IMG: Cirrus in B&W
From: "Chris Trask" <christrask@xxxxxxxxxxxxx>
Date: Mon, 12 Mar 2012 11:54:00 -0700
>
> I've probably shown this here before but here goes again
> <http://www.chucknorcutt.com/dust%20spec%20test/index.htm>
>
> There are two images here taken with my Minolta A1.  The A1 has an f/2.8
> lens and uses a 49mm filter.  I don't have the camera with me but would
> guess the clear aperture at about 45mm.
>
> One of the shots is with an unobstructed lens.  The other has a 1/2"
> square piece of electrical tape stuck in the middle of it and
> obstructing about 10% of the surface area.  Probably much less area than
> the gouge you were talking about.
>
> The third image on the page is a paired 1:1 pixel view of the flower
> details from both shots.  Can you tell the difference?  Maybe.  Could
> you tell the difference at 50% rather than 100%.  I doubt it.
>

    I cannot discern any difference at all.  Had I had this demonstration in
mind, I would have bought that lens.  Now, it's $40 of gas away.  <<SIGH>>

Chris

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