Archived posting to the Leica Users Group, 2011/08/26
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Jim Nichols wrote: >>> I have experimented with a bellows, and I am amazed at the shallow DOF that results. I got a hint of this when I read the instructions for using the extension with the 60mm Macro. The instructions specify setting the lens at smallest aperture before adding the extension. <<< The instructions for the 60 Macro specify setting the lens aperture at the smallest setting before adding the 14198 extension tube because the 14198 has its own aperture ring, and it also has a collar that covers the lens aperture ring. Setting the lens aperture ring to the the smallest setting allows the lens to fit the 14198 because this extension tube has a lockout that prevents the lens from being mounted if the lens aperture ring is not set to f/22. This allows the extension tube aperture ring to use the full range of apertures. The whole reason behind the aperture ring on the 14198 was that its first metering cam adjusts for the extension factor. With any extension other than the 14198 the lens aperture ring does not need to be set to any particular value. Doug Herr Birdman of Sacramento http://www.wildlightphoto.com -------------------------------------------------------------------- myhosting.com - Premium Microsoft? Windows? and Linux web and application hosting - http://link.myhosting.com/myhosting