So Bart, would I have to assume in your scenario that the 105mm would allow me the same depth of field as the 60mm should I choose to move further away from the subject thus forcing me to seriously crop my image to achieve the same affect as the 60mm (final image magnification for presentation)? Just trying to decide if I need to include the 60mm in my arsenal of lenses.
You would not need to crop at all. Once you move back with your 105mm to get the same magnification as the 60mm the images will be the same size. Interceptor121 has a lot of good other comments on field of view and background. Like CamelToad if I had to choose between my canon 100mm and 60mm I would keep the 100mm. And like Bill I am now using m43 with the 60mm which happens to sit right in between the 60mm and 100mm when used on APS-C.
I think for most people the two dominant reasons to prefer the 60mm over 100mm is that the former is more versatile because it gives more leeway to get images of larger critters as well as the small stuff without having to back off too much. The other is for people who dive in peasoup and want to get as close as possible. The 100mm advantages are when you want a bit more working distance for lighting or to not scare your subject. I almost exclusively shoot fish for which the latter is important. If my passion was nudibranch I would probably keep the 60mm. A secondary advantage is for those using wet diopters. They give more bang for the buck on longer lenses.
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