Graflex.org

unclened · Joined: 07 Dec 2014 Posts: 7 Location: United Kingdom

I have the Aero Ektar 178 f2.5 and the 135 f4.7 Graflex lens on a Pacemaker Speed Graphic. I'm finding that the focussing margin for infinity focus and objects that are far away is really small. Near focussing is the opposite and has lots of margin. Is this normal? Can I adjust it in anyway to give me more latitude when focussing on faraway subjects?

Thanks in advance for any guidance offered.

45PSS · Posted: Sat Dec 20, 2014 8:11 pm Post subject:

Normal lens characteristics.
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unclened · Joined: 07 Dec 2014 Posts: 7 Location: United Kingdom

thank you, so am I right in understanding that depth of field is does not have linear relationship with subject distance?

Sirius Glass · Posted: Tue Dec 23, 2014 9:15 pm Post subject:

At a given aperture the Depth of Field [DOF] increases as the focus move toward infinity.

For example at a given aperture the lens might focus from 3 feet /1 meter to 15 feet/5 meters when focused to 9 feet/3 meters. Extend the focus to 30 feet/10 meters and the lens might focus from 15 feet/5 meters to infinity.