[meteorite-list] Meteorite Photography

From: Dark Matter <freequarks_at_meteoritecentral.com>
Date: Wed, 27 Jan 2010 12:17:56 -0700
Message-ID: <822da19a1001271117o6114f106ub673fbd386995997_at_mail.gmail.com>

Hi All,

While 2.8 does not seem all that fast, it is a standard speed for
macro/micro lens. However, the big guns for sports, news, and wildlife
routinely have 2.8 firepower with the 300 2.8 as the standard and even
a 400 2.8! 500s and 600s are available in f4. Ultra wides in the 2.8
range are also considered screamers.

The fastest lens I know of is Leica's 50mm F0.95

-Martin



On Wed, Jan 27, 2010 at 11:44 AM, Matson, Robert D.
<ROBERT.D.MATSON at saic.com> wrote:
> Hi Eric, Al, Erik,
>
>> Erik is right, The higher f-stop of 22 will increase depth of field
> ...
>
> Yes.
>
>> ... not sharpness of focus.
>
> Unless you have a very good lens, it will ALSO increase sharpness of
> focus for stationary objects.
>
>> This is why sports photographers use a low/large f-stop lens like
>> f2.8 lenses.
>
> (f/2.8 is actually not that fast a lens for a professional. f/1.4 is
> a fast lens.)
>
>> The reason is simple, the smaller aperture only allow focus on a
>> small area of the subject, blurs out the background and has a
>> very shallow DOF ...
>
> All of these points are true, but that's not the main reason sports
> photographers use low f/#. In sports photography, short exposure times
> are crucial so that action isn't blurred. This cannot be achieved at
> high f/# because the stopped-down lens doesn't let in enough light
> for a properly exposed image. That said, professional photographers
> usually do NOT use the fastest f-stop of a lens since the lens
> periphery has the maximum optical aberrations. An image (of a still
> object like a meteorite) taken at f/1.4 using an f/1.4 lens will
> rarely be as crisp as an image taken with the same lens at f/2.
>
> Best,
> Rob
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Received on Wed 27 Jan 2010 02:17:56 PM PST