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--- doc:appunti:hardware:olympus-e-m10:manual_lens [2022/11/15 13:14] – [Depth of field in portraits] niccolo
+++ doc:appunti:hardware:olympus-e-m10:manual_lens [2022/12/15 11:13] (current) – [Third party lens manufacturer] niccolo
@@ Line 163: / Line 163: @@
 ===== Depth of field =====
-The **[[wp>Hyperfocal distance|hyperfocal distance]]** is the distance to focus to have the max depth of field at the given aperture and focal length. All objects in the DoF range are into an "acceptable" focus. The DoF far limit is inifinity and the near limit is HD/2.
+The **[[wp>Hyperfocal distance|hyperfocal distance]]** is the distance to focus to have the max depth of field at the given aperture and focal length. All objects in the DoF range are into an "acceptable" focus. The DoF near limit is half the hyperfocal distance, the  far limit is inifinity.
 ^  Using a 25 mm lens on a Micro Four Thirds sensor  ^^
@@ Line 178: / Line 178: @@
 ==== Depth of field in portraits ====
+Here is an handy table to know the depth of field when shoting portraits. I think that the wider apertures of the Meike (f/numbers below 4.7) are extremely effective starting from medium or more distant shots. With close-ups, care must be taken that not all parts of the head may be in focus.
+^  Framing with a 25 mm lens, MFT sensor (50 mm eq.)  ^^^  Depth of field  ^^^
+^ Shot type  ^ Height dim.  ^ Focal length  ^  f/1.8  ^  f/5.6  ^  f/16  ^
+| Choker  (from eyebrows to mouth)  |   20 cm |   42 cm |    1 cm |    5 cm |   13 cm |
+| Close-up  (shoulder and head)     |   40 cm |   84 cm |    6 cm |   19 cm |   58 cm |
+| Medium shot (from the waist up)   |   70 cm |  146 cm |   18 cm |   59 cm |  231 cm |
+| American shot  (mid thigh)        |  120 cm |  250 cm |   54 cm |  189 cm |    49 m |
+| Full shot (head to toes)          |  200 cm |  417 cm |  153 cm |  687 cm |       ∞ |
-^ Inquadratura       ^ Disanza con obiettivo 25 mm  ^ DoF a f/1.8  ^
-| Primissimo piano  |  |
-| Primo piano       |  |
-| Mezzo busto       |  |
-| Piano americano   |  |
-| Figura intera     |  |
 ===== EXIF data =====
@@ Line 204: / Line 207: @@
 There are several vendors of manual lenses that can be mounted on cameras of well known manufacturers, such as Olympus, Canon, Nikon, etc. They offer good quality for a fraction of the cost of the original lenses. Almost all are Chinese manufacturer, which have reached very high standards of quality. Here a partial list of some of them, please follow the link to **sponsor my affiliate programs**.
-  * **[[https://www.amazon.it//review/R37KAL7C2ON8XB/ref=cm_rv_eml_rv0_rv|My review of the Meike 25mm f/1.8 on the Amazon site]]**
   * **[[https://meikeglobal.com/|Meike]]**
+  * **[[https://www.pergear.com/?ref=2BPZm|Pergear]]**
   * **[[https://7artisans.store/?ref=FRFtTFVb|7Artisans]]**
-  * **[[https://7artisans.store/products/25mm-f1-8?ref=FRFtTFVb|Manual lens 25mm f/1.8 by 7Artisans]]**
-  * **Risespray**
   * **[[https://ttartisan.com/|TTArtisan]]**
+  * **[[https://www.amazon.it//review/R37KAL7C2ON8XB/ref=cm_rv_eml_rv0_rv|My review of the Meike 25mm f/1.8 on the Amazon site]]**
+  * **[[https://www.pergear.com/products/pergear-7-5mm-f2-8-fish-eye-manual-focus-fixed-lens?ref=2BPZm|Pergear 7.5mm F2.8 fish eye]]**
+  * **[[https://7artisans.store/products/25mm-f1-8?ref=FRFtTFVb|Manual lens 25mm f/1.8 by 7Artisans]]**