>
>> I'm working on improving my abilities with infrared (IR) photography and
>> I'm finding that using the IR focusing mark on my prefered MF lens does
>> not produce sharp images. I'm going to evaluate other lenses that I have
>> available, but in the meantime I'd like to ask if it is prefereable to
>> use a primary (ie - fixed FL) lens for this, or is there a zoom lens in
>> the near wide (28-35mm) to near telephoto (70-85mm) range that will
>> produce sharp IR images?
>>
>
>Stick with primes, Chris. If you're having difficulty with a prime it
>will likely only be moreso with a zoom. You might want to have a look
>at the Wiki article on the challenges of focusing infrared images. Note
>especially the mention of increased diffraction using infrared. That
>may invalidate one's normal reaction to stop down to improve focus.
><http://en.wikipedia.org/wiki/Infrared_photography#Focusing_infrared>
>
I'll dig a couple out and give them a try. I have a Vivitar/Kiron 28/2.5
and Vivitar TX/Tokina 35/2.5 that are worth looking at (or should I say
"through"?).
One thing I've noticed with this is that the internal meter on the E-510
is way off when the 750µ IR filter is on. The meter indicates that I should
use 1/250 at f/5.6 whereas the correct exposure is 4-5 seconds. Is there
something about the internal metering, such as high red sensitivity, that I/we
should be aware of?
Chris
When the going gets weird, the weird turn pro
- Hunter S. Thompson
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