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Leica M24o (M Type 240)
Leica M24o (M Type 240)

Usability: Exposure Limits

Firmware version 2.0.0.11.

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 1.1.0.2), 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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Since 2009, Diglloyd Guide to Leica is the authoritative review and reference for Leica M lenses: Leica M, Zeiss ZM, Voigtlander, as well as Leica M digital bodies. Leica S is also included.

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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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