07-13-2015, 08:03 PM
Quote: What makes that a "telescope lens"? Ok, in a quick look, the length + flange distance would suggest it isn't telephoto design, but regardless I'd still consider it a lens.It not being a telephoto design makes it a long-focus lens, but not a telelens. I guess it is not done to call these telescope lenses

![[Image: HD%20Pentax-DA%20560%20optics.jpg]](http://www.pentaxforums.com/content/uploads/files/77/p601/HD%20Pentax-DA%20560%20optics.jpg)