doc:appunti:hardware:olympus-e-m10:pergear_fisheye
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doc:appunti:hardware:olympus-e-m10:pergear_fisheye [2022/12/17 17:35] – [The Pergear 7.5mm F2.8 Fish-Eye] niccolo | doc:appunti:hardware:olympus-e-m10:pergear_fisheye [2022/12/20 09:40] (current) – [Lens-flare] niccolo | ||
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====== The Pergear 7.5mm F2.8 Fish-Eye ====== | ====== The Pergear 7.5mm F2.8 Fish-Eye ====== | ||
- | **Obiettivo manuale fish-eye | + | **Obiettivo manuale fish-eye |
^ Specifications | ^ Specifications | ||
- | | Focal length | + | | Focal length |
- | | Angle of view | 130° (on MFT) | | + | | Angle of view | 130° (on MFT) | |
- | | Aperture range | f/2.8 - f/22 | + | | Aperture range | f/2.8 - f/22 |
- | | Focus range | 12 cm - ∞ | | + | | Focus range | 12 cm - ∞ | |
- | | External dimensions | + | | External dimensions |
| Weight (excluding caps and hoods) | | Weight (excluding caps and hoods) | ||
- | The specifications above are provided by the manufacturer and are quite approximative; | + | The specifications above are provided by the manufacturer and are quite approximative; |
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{{pergear-sun-flares.jpg? | {{pergear-sun-flares.jpg? | ||
{{pergear-light-flares.jpg? | {{pergear-light-flares.jpg? | ||
+ | |||
+ | ===== Aberrazione cromatica ===== | ||
+ | |||
+ | Una lente in generale può essere affetta da due tipi di [[wp> | ||
+ | |||
+ | * **Axial chromatic aberration**: | ||
+ | * Typical at long focal lengths. | ||
+ | * Occurs throughout the image. | ||
+ | * It is reduced by stopping down (due the augmented depth of field). | ||
+ | * Difficult to remedy in post-processing. | ||
+ | * **Transverse chromatic aberration**: | ||
+ | * Typical at short focal lengths. | ||
+ | * Increases towards the edge. | ||
+ | * Tt is not affected by stopping down. | ||
+ | * Can be corrected by radially scaling the RGB planes appropriately so they line up. | ||
+ | |||
+ | FIXME: Vediamo quanto incide l' | ||
+ | |||
===== Third party lens manufacturer ===== | ===== Third party lens manufacturer ===== |
doc/appunti/hardware/olympus-e-m10/pergear_fisheye.1671294908.txt.gz · Last modified: 2022/12/17 17:35 by niccolo