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EXCERPT page containing first few paragraphs. 2017-03-27 21:26:05

Leica M24o (M Type 240)

Usability: Exposure Limits

Firmware version

The shutter speed dial design precludes using an exposure longer than 8 seconds in manual exposure mode (though auto exposure goes to 60 seconds with the M240).

In addition, there is a hard limit of 60 seconds for exposure at ISO 200 (as of firmware, with shorter limits for higher ISO values.

In practice, this means that night exposures are often 1-3 stops underexposed for interesting outdoor conditions, greatly increasing the noise. Yet well exposed 60 second images show no sign of this being a sensor quality limit.

Tuolumne River erratic by moonlight

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32 sec @ ~ƒ/2.8, ISO 200, 0.2 pull
Leica M240 + 50/2 APO-Summicron-M ASPH
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