Andrew McPhee wrote:
> At 01:40 AM 24/03/2006 +0000, you wrote:
>
>> ...I've also been trying to figure out what the red/green lines on the barrel
>> of the Tokina actually mean - ISTR there being a post about this on list, but
>> the search engine turned up nothing. One straight green line, with a red line
>> starting from the same point
Shouldn't be exactly the same point, fairly close, but offset.
>> , but ending up about 1/2in away at the front of
>> the lens, with the 80 / 100 / 135 / 200 markings on the left)
>>
Like this <http://moosemystic.net/Gallery/tech/CRW_2293.jpg>? I have
another Tokina RMC 80-200 around somewhere, but Tokina's IR markings are
consistent across the zooms I have.
> I don't have that lens, but my guess is the red line is for infra-red
> focusing. When using IR film frame the shot and focus as normal then
> before taking the photo re-adjust the focus point from the green to the red
> line.
>
Exactly right!
> The reason for this IIRC is that IR waves are longer (or shorter?) than
> light waves.
>
Longer.
Moose
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