Archived posting to the Leica Users Group, 2000/02/28
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]David, which summicron focuses to 1/3 meter? All of my models of various generations got to 1m or .7m, and no closer. best of light, Alistair - -----Original Message----- From: drodgers@nextlink.com [mailto:drodgers@nextlink.com] Sent: Monday, February 28, 2000 7:34 PM To: leica-users@mejac.palo-alto.ca.us Subject: [Leica] Re: The Summicron Austin You wrote: >>Since the 'lux opens up more than the 'cron, the 'lux is capable of far less depth of field than the 'cron.<< Technically, because the 'cron has a closer mimimum focusing distance, it is capable of creating a photograph with less depth of field than the 'lux. For instance, a 'cron will at it's minimum focusing distance (approx 1/3 meter) and maximum aperture (f2) have less depth of field than a 'lux at it's minimum focusing distance (approx 1 meter) and maximum aperture (f1.4). So in theory the 'cron is capable of less depth of field than the 'lux. DOF is a function of focusing distance, not just aperture setting. The closer the plane of focus, the less depth of field. However, I'd agree that if both 'cron and 'lux were wide open and focused at, say, 10 feet, the 'lux could provide less depth of field with f1.4. David