I picked up the zoom for my Sony Nex 5 today as the 16/2.8 P lens is
a bit wide for some applications and I was hoping it be ok for
digiscoping.
Unfortunately it is a bit too recessed for digiscoping with a
conventional eyepiece ( 17 - 20 mm of ER ) , even on a Balance Bar,
so I tried it with the Kowa 25x LER eyepiece. Good results from 27
mm ( manageable vignetting) to 48 mm ( no vignetting ). This gives a
range of 675 - 1200 mm with Auto Focus on a Balance Bar. This is a
good range for garden digiscoping. It does seem to be internally
focusing but I haven't tried it with a conventional adapter yet .
I will test it out in the field tomorrow.
Neil
Hong Kong,
China.
Oct 2010
a bit wide for some applications and I was hoping it be ok for
digiscoping.
Unfortunately it is a bit too recessed for digiscoping with a
conventional eyepiece ( 17 - 20 mm of ER ) , even on a Balance Bar,
so I tried it with the Kowa 25x LER eyepiece. Good results from 27
mm ( manageable vignetting) to 48 mm ( no vignetting ). This gives a
range of 675 - 1200 mm with Auto Focus on a Balance Bar. This is a
good range for garden digiscoping. It does seem to be internally
focusing but I haven't tried it with a conventional adapter yet .
I will test it out in the field tomorrow.
Neil
Hong Kong,
China.
Oct 2010