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Hi
Radek
If you
get the CNC tube with the 3" focuser, you'll be able to use the standard TMB/APM
medium format Field Flattener. If you get the FF with a Pentax
67 camera mount - be sure it's the Japanese manufacture version - it
should allow you to mount almost any 35mm or CCD camera using standard
thread-on Borg components available from Hutech in the USA. This option
would give you the greatest flexibility in mounting cameras of any type, and the
nice thing about the Borg adapters is that they preserve the correct FF-to-film
plane spacing. I suspect that the FeatherTouch focuser is actually a
better unit (I haven't tried one, but hear they are excellent), but unless you
can be sure that a Field Flattener is available to fit it,
you may have problems with image quality shooting at prime focus without a
FF. It may also be possible to get a reducer for the TMB115, but certainly
if you get the TMB/APM FF, there are Borg components to mate a 2" accessory like
the TeleVue reducer.
Unfortunately, there are a couple of different APM Pentax 67 camera
mounts around. The Japanese manufactured versions I have for my
TMB152 and TMB105 both accept the Borg adapters for 35mm, and I'm certain that
Ted Ishikawa at Hutech has something to fit any 2" or C-mount accessory as
well. It will be important to determine what version you are getting
before you buy. Good luck, and good shooting. I think that with a
FF, that 115 will be an excellent astrophotography
instrument.
Jon Kolb |
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