On 1/20/2011 11:04 AM, George Themelis wrote:
> 2. Are zoom lenses more susceptible to haze vs. fixed focal length lenses?
>
> And what causes this internal haze?
I see this has been addressed, but one factor not yet mentioned. None of the
lenses you are talking about are sealed. So
when the elements move, air is pushed around, both redistributing anything in
it to begin with and 'pumping' air in and
out of the lens.
As a general rule, prime lenses have less element movement than zooms and short
focal lengths have less movement than long.
Sooo. Things that cause haze, fungus spores, moisture for them to sprout, dust,
dispersed petroleum fractions from
helical grease breakdown, smoke, smog, cigarette smoke, etc. are more likely to
be found in some lenses than others.
Use a wide range, long, single control zoom actively, and you cycle lots and
lots of outside air through it. All the
detailed bits inside act like filter elements. So shoot only in dry, clean air.
:-)
A. Movable Moose
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