Tamron focal length visualization tool

Archived from groups: rec.photo.digital.slr-systems (More info?)

On Saturday 25 June 2005 10:22, Brian Sullivan wrote:

> I have been poking around looking at digital SLR cameras and lenses
> lately. Not having experience with SLRs of any description, I have
> been having a hard time getting a mental picture of what various focal
> length lenses mean in real terms.
>
> I haven't seen this posted here before so I thought it was worth
> adding a link to a Tamron tool that helps:
>
> http://www.tamroneurope.com/flc.htm

Cute tool, but since there seems to be no place to set the focal length
conversion factor, the view shown for "Digital" will only be
approximate. For example, my Canon D30 has conversion factor of 1.6.
So, a 24mm lens on the D30 would have the same angle of view as a
38.4mm lens (24 * 1.6) on a 35mm film camera. However, on the Nikon
D70 which has a conversion factor of 1.5, that same 24mm focal length
would be equivalent to a 36mm.

A rough calculation based on angle of view indicates that Tamron is
using a conversion factor of around 1.56 to 1.59. Still, it's a useful
little tool. I'm going to bookmark it.

--
Stefan Patric
NoLife Polymath Group
tootek2@yahoo.com