The below information is compiled from a line of posts by MR and JD.
I have found with the C2100/E-100rs you can stack a C210 and B300
teleconverter for a 3.2x. The quality is good and maintains all the
automatic functions of the camera, there is some very slight
vignetting and about 1 F-stop loss of light. This gives you a 35mm
equivalent of 1227MM lens.
The Set-up requires you to buy a C210 (about $59 at Adorama), you
will need a 49 to 52mm step up ring for C2100 to C210
teleconverter. then you will need a 49 to 55mm Step-up ring that is
epoxied to front of C210 to add needed threads (epoxied used was
Simpson Epoxy tie, about $7 at home depot, and is extremely
strong). Care must be exercised not to drip epoxy on front element
of C210. This can be accomplished by putting a bead of epoxy on the
flange of the 49 to 55mm step-up ring, and placing the front on the
C210 down into. Allow 24 hrs. for set, then B300 will screw into
the 55mm thread.
When handholding it is easy to support the lens combo. I usually
set my UZI on Shutter priority to 1/800 to minimize camera shake.
You need a strong tripod to hold it. It is a long lens with some
weight to it. It would be preferable if added support could be
added. I am going to see if the lens support for my Eagle eye will
fit around the base of the C210, to centre balance the Combo more.
The C-210 is really small, the outer lens is not much larger than
the B300 inner lens (about 1/2") The inner glass is tiny at 3/4" in
diameter. Not a problem though. It is about 2 -1/2" long, very very
light weight. Doesn't appear to be quite as well made as the B300.
"Made in Taiwan". Again , not a problem considering that the lens
is only $59.00 and provides 1.9X tele.
I don't believe I am getting any more vignetting, than if I shot
with the C210 without the 49-55 step-up in front of the lens. The
reason I like the 49 to 55 mm step-up is to give me some surface
area for the epoxy, to bond to. But a thinner Step-up ring may work
It should be noted that the lens hood that snaps into place now
when you pull it out all the way. Will pull out, but wont snap into
place after 49-55 step-up is epoxied on. But I think you be happy
with results of this combo compared to any manufactured conversion
lens available.
The C-210 appears to be pretty close to the B300 in clarity and
sharpness when plenty of light is available, but due to the smaller
glass it doesn't perform nearly as good unless there is plenty of
light. I did compare them in darker and lighter situations. The
B300 was exceptional as usual but the C-210 needs more light to be
able to capture a sharp image . Of course this was not on a tripod.
It might be OK when used with slower tripod speeds. I handheld and
used a monopod (love that monopod). The difference of image
magnification between the B300 at 1.7X and the c-210 at 1.9X is
noticeable. Image size is substantially larger with the C-210, but
NOT one tiny bit of zoom range (without vignetting appearing ) is
possible
I could not get the C-210/B-300 set-up to vignette . I don't
understand but after approx 30 images I could barely detect
vignetting in only a couple. No vignetting when used at full tele
alone with the C2100 either..
Pictures of the set-up and a few samples can be found at
http://albums.photopoint.com/j/AlbumIndex?u=1767819&a=13650334
Regards, Maxven