On 3 Oct 2003 at 23:44, Tom Pfeiffer wrote:
> The article says it's HSM, although the title doesn't. Gel filters
> seem ok, ANYTHING would likely vignette on the front of a 12mm,
But *not* with a 17mm on a full-size frame....that's 104
degrees....while 12mm on a non-full-size frame is only equivalent to
20mm, or 94 degrees....and not even a 14mm accepts front filters.
(for full-size, it's quite an easy riddle to remember:
24mm 84 degrees
20mm 94
17mm 104
14mm 114
For many filters it's hardly a problem, but for polaroid and opaque
filters it still is a dilemma (the latter even more for UV-pass
instead of IR-pass, since UV-pass requires glass (although there is a
thin non-glass alternative).
> and
> gel filters are the norm for superwides anyway.
Full-size 104 degrees can still be handled with front filters...
(even though Canon doesn't make such a 17mm themselves)
--
Bye,
Willem-Jan Markerink
The desire to understand
is sometimes far less intelligent than
the inability to understand
<[EMAIL PROTECTED]>
[note: 'a-one' & 'en-el'!]
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