Hi Adam

> The K100D does not permit you to override focal length parameters.

Damn!

> But I believe that focal length and lens ID are tranmitted seperately.

I'm not sure how that would help.

> I'm not aware of any TC for Pentax bodies which contains actual 
> firmware, which would be necessary to communicate actual focal 
> length to the body. Canon EF TC's have firmware and can do the calculations.

It looks like it's tripod time with TC's then.

Thanks Adam,

John


---------- Original Message -----------
From: Adam Maas <[EMAIL PROTECTED]>
To: Pentax-Discuss Mail List <[email protected]>
Sent: Sat, 25 Nov 2006 18:49:52 -0500
Subject: Re: FL information & SD ( was Reservations about DA 16-45)

> John Whittingham wrote:
> > Hi Christian
> > 
> >> It certainly is.  However, with the matching 1.4x and 2x EX 
> >> converters it still shows up as 300mm.  I'm not sure if that would 
> >> adversely effect SR (600mm vs 420mm vs 300mm).  As a point of 
> >> example, the Canon 300/4 and 1.4x converter show as 420mm in the 
> >> EXIF data and the 600/4 + 1.4x show up as 840mm.
> > 
> > Forgive me I've been away from the list for some time, it was you who 
told me 
> > originally I believe, as well as showing some of your great images. I 
feel OK 
> > with the 300 and converters because I can enter the focal length manually 
as 
> > long as the camera will let me. I'm pretty sure I should be able to 
overide 
> > the automatic settings, but it remains to be seen. It's the zoom I'm 
> > concerned with knowing some of the problems Canon owners have had to put 
up 
> > with Sigma lenses such as the 70-200/2.8 EX.
> > 
> > Regards
> > 
> > John
> > 
> > John Whittingham
> >
> 
> The K100D does not permit you to override focal length parameters. 
> But I believe that focal length and lens ID are tranmitted seperately.
> 
> I'm not aware of any TC for Pentax bodies which contains actual 
> firmware, which would be necessary to communicate actual focal 
> length to the body. Canon EF TC's have firmware and can do the calculations.
> 
> -Adam
> 
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