[Leica] IMGS: Comparing SL and M240 and 19R and Noctilux

[jbmmllug at jbm.org (Jeff Moore)]

On Dec 1, 2015 2:01 AM, "Philippe" <photo.philippe.amard at gmail.com> wrote:
>
> There must be some submenu in the menus that allows you to choose a
minimal shutter speed (then auto ISO will compensate for the lack of light
and allow you to shoot steadily in available darkness).
>
> Even the fujis have this feature.
>
> Must be hidden somewhere, and might be described in the manual.

Of course (for those rare stationary subjects) the big SL zoom lens's OIS
should let you get away with improbably slow hand-held speeds; but for
regular M or R lenses...

It looks as if the SL has basically the same sort of automatic
slowest-exposure-time choice in the auto-ISO settings you're probably
already familiar with from the M240.  Here's a quote from the SL manual:

-------------------------------------

Auto ISO Setting
When ISO is set to Auto, the camera automatically adjusts the
sensitivity to match the ambient brightness. However, when using
the function, it is also possible to specify priorities, for example for
compositional reasons. This enables you to limit the range of
sensitivities used (e.g. to control noise) and also to set the shutter
speed above which the automatic increase in sensitivity is
activated (instead of using continually slower shutter speeds, e.g.
to prevent blurred pictures of moving subjects).
Setting the functions
1. In the menu's SETUP section, select Auto ISO Settings,
2. in the submenu Auto ISO Photo, and
3. in the next submenu Maximum ISO, Maximum Exposure Time or
Floating ISO, and
4. select the desired settings in the respective submenus, or
switch the Floating ISO function On or Off.
Floating ISO is intended for use with zoom lenses with varying full
stops. When set to ON, it can compensate their changing effective
apertures while zooming in the following situations:
? in manual exposure control mode
? ISO is set to one of the values, i.e. not to Auto ISO
Notes:
? Maximum ISO and Maximum Exposure Time are only effective
when ISO is set to Auto ISO.
? 1/f results in the slowest possible shutter speeds based on the
rule of thumb for free-handed, blur-free pictures, e.g. 1
?100s with a
focal length of 100mm. 1/2f is principally the same, except that
it results in twice as fast shutter speeds whenever possible, e.g.
for even more safety against blurred pictures.