Depth of Field

The depth of field refers to the nearest and farthest points in your photograph that are in focus in your shot. A lens can only focus on one single distance fully, but with a wide depth of field, areas both closer and further from that one point are relatively in focus as well. Stopping down to a smaller aperture increases the depth of field, and will result in more of the photograph being in focus.

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Vintage Asahi Pentax Honeywell Spotmatic 35mm / Hanimar 55mm Prime Lens picture
Vintage Asahi Pentax Honeywell Spotmatic 35mm / Hanimar 55mm Prime Lens
Hanimar 1:3.5 f=135mm No. 22256 Lens with Case. Nice and Clean and Clear. picture
Hanimar 1:3.5 f=135mm No. 22256 Lens with Case. Nice and Clean and Clear.
Pentax M42 Screw Mount Lens Hanimar Auto 1:2.8 F135  picture
Pentax M42 Screw Mount Lens Hanimar Auto 1:2.8 F135
Hanimar, Takumar, Telesar, Soligor Lenses Bundle picture
Hanimar, Takumar, Telesar, Soligor Lenses Bundle
Vintage Hanimex 35SL camera, 35mm/2.8, 135mm/2.8 lens, and Hanimar 55mm/1.7 Lens picture
Vintage Hanimex 35SL camera, 35mm/2.8, 135mm/2.8 lens, and Hanimar 55mm/1.7 Lens