Sony ILCE-6500 Manual page 291

The higher the ISO value, the more noise will appear on the images.
The available ISO settings will differ depending on whether you are shooting still images, shooting
movies, or shooting slow-motion/quick-motion movies.
When shooting movies, ISO values between 100 and 25600 are available. If the ISO value is set to a
value larger than 25600, the setting is automatically switched to 25600. When you finish recording
the movie, the ISO value returns to the original setting.
When you use [Multi Frame NR], it takes some time for the product to perform the overlay processing
of images.
When you select [ISO AUTO] with the shooting mode set to [P], [A], [S] or [M], the ISO sensitivity will
be automatically adjusted within the set range.
Hint
You can change the range of ISO sensitivity that is set automatically in [ISO AUTO] mode. Select
[ISO AUTO] and press the right side of the control wheel, and set the desired values for [ISO AUTO
Maximum] and [ISO AUTO Minimum]. The values are also applied when shooting in [ISO AUTO]
mode under [Multi Frame NR].
You can set the effect level for noise reduction by selecting [NR Effect] under [Multi Frame NR].
[308] List of MENU items
ISO AUTO Min. SS
If you select [ISO AUTO] or [ISO AUTO] under [Multi Frame NR] when the shooting mode is P
(Program Auto) or A (Aperture Priority), you can set the shutter speed at which the ISO
sensitivity starts changing.
This function is effective for shooting moving subjects. You can minimize subject blurring while
also preventing camera shake.
MENU →
1
Menu item details
FASTER (Faster)/FAST (Fast):
The ISO sensitivity will start to change at shutter speeds faster than [Standard], so you can
prevent camera shake and subject blurring.
STD (Standard):
The camera automatically sets the shutter speed based on the focal length of the lens.
SLOW (Slow)/SLOWER (Slower):
The ISO sensitivity will start to change at shutter speeds slower than [Standard], so you can
Camera Settings1
(Camera Settings1) → [ISO AUTO Min. SS] → desired setting.