Archived posting to the Leica Users Group, 2020/10/08
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]But I can be very patient and still have friends at KEH. On Thu, Oct 8, 2020, 3:14 PM Jim Nichols <jhnichols at lighttube.net> wrote: > Thanks for the comments, Don. I think you will find that 1.4s are very > scarce. > > On 10/8/20 3:02 PM, Don Dory via LUG wrote: > > I think that the difference is close enough that I would use either > > depending on magnification needed. The extension tube is higher in > > contrast which helps perception of sharpness. In all things compromise > is > > inherent so choice will be made based on priorities of the moment. I do > > appreciate the research as I now will be looking for an inexpensive R > > teleconverter although I might try for a 1.4. > > > > On Thu, Oct 8, 2020 at 1:10 PM Jim Nichols <jhnichols at lighttube.net> > wrote: > > > >> I've been using the Leica-R 60 macro lens for a few days and began > >> wondering which gave the best results, adding the dedicated extension > >> tube or the tube plus the Leica-R 2X Extender. So, I did a kitchen > >> counter experiment. Using kitchen lights and a shiny dime, I first > >> combined the dedicated extension tube with the 2X extender and mounted > >> the assembly on an old Star-D tripod. I adjusted the height so that the > >> image of the dime filled the height of the frame, and took several > >> exposures. Here is the resulting image: > >> > >> http://www.gallery.leica-users.org/v/OldNick/20201008-DSCF2180.JPG.html > >> > >> I then removed the 2X Extender and mounted the lens and extension tube > >> as it was intended to be used. I took several images of the dime, which > >> now filled about half the height of the frame, and cropped the resulting > >> image to match the first one: > >> > >> http://www.gallery.leica-users.org/v/OldNick/20201008-DSCF2192.JPG.html > >> > >> It is my opinion that the lens/tube combination is sharper without the > >> 2X Extender, even with enlargement. I am ignoring differences in > >> lighting with this setup. > >> > >> -- > >> Jim Nichols > >> Tullahoma, TN USA > >> > >> > >> _______________________________________________ > >> Leica Users Group. > >> See http://leica-users.org/mailman/listinfo/lug for more information > > > > > -- > Jim Nichols > Tullahoma, TN USA > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information