Re: New camera?

[Bertha Adamson <badamson@xxxxxxxxxxxxx>]

Frank Schiffel wrote:
> 
> --- Deena Weintraub <bertie@xxxxxxxxxxx> wrote:
> > And my question is - there's no mark on the camera body or lens
> > for infrared.  Do I just use autofocus with infrared film?  This
> > is the Nikon F100, and the manual doesn't talk about infrared
> > at all.
> 
> There are a couple of solutions.  One would be to advance your lens 1/4% of its
> focal length.  Easier said than done. <g>
> 
> The other is simply to close down a bit.  As long as you are not shooting close
> and not using a long lens, stopping down to about f8 or f11 should give you
> enough depth of field to correct most focusing errors.
> 
> Cheers -
> 
> george
> 
> depending on the lens you are using, there is an IR mark on it. at the center of the barrel, you should see a focus mark. to the left of that is an IR mark. depending on the lens, the IR mark will be red, or you will see a white dot and a white line to the left of the usual focus point that white line is your IR focus mark.
> 

It's not just using autofocus that is the problem. Many modern autofocus
have NO IR markings whatsoever, whether focusing manually or
automatically. NONE of the lenses for the Canon EOS system that I OWN
have the mark. (Of course, I have less expensive lenses.) So, I have to
shot at f/8 to f/16 to cover a wide depth, or just make an educated
adjustment, i.e. guess. 

This is why I also picked up a used Canon AE-1P with old lenses that do
have the mark, to use for IR. That is, until a tragic wind accident at
Bodie, CA. **Sob!**

But, I have had little problem with focus in my pictures by using f/8 or
above with the autofocus lenses.

Bertha
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