Optical material
Technical Optical Dataエリアセンサー CCD & CMOS イメージャーサイズ(単位:mm)
Below are typical sizes. Please note that there are different sizes even if they are the same inch.
How to find the imaging range and focal length of a CCTV lens
How to obtain monitor magnification and overall magnification
- monitor magnification
- Monitor inches x 25.4 (1 inch) ÷ camera diagonal image size
- Overall magnification
- Monitor Magnification x Optical Magnification
Front converter lens and rear converter lens
このレンズは単体では使用できず、主レンズと組み合わせて使用するレンズです。 フロントコンバータレンズは主レンズの前側に取り付けて使用し、リアコンバータレンズは主レンズの後側のCマウントに取り付けて使用します。その時、光学的性質が以下のように変化します。
- M.
- Main lens magnification
- NAMore
- Main lens front numerical aperture
- NA'
- Rear numerical aperture of main lens
- MI
- Front converter lens magnification
- M2
- Rear converter lens magnification
- MT
- total magnification
- NAT
- Front total aperture
- NA'T
- Rear total numerical aperture
ラインセンサー イメージサイズ(単位:mm)
Imaging relational expression
- f
- Focal length
- FF
- front focus
- FF'
- back focus
- H.
- front principal point
- H'
- rear principal point
- P.
- physical point
- P'
- image point
- S.
- Distance from front principal point to object point
- S'
- Distance from back principal point to image point
- X
- Distance from front focus to object point
- X'
- Distance from back principal point to image point
- M.
- magnification
- R.
- resolution
- d
- depth of field
- R'
- Image sensor resolution (2 pixels)
- λ
- wavelength
- NAMore
- Object side numerical aperture
- NA'
- Image side numerical aperture
- An inverted real image is obtained when M is negative, and an erected virtual image is obtained when M is positive.
- General lenses have a negative M, while front converter lenses and rear converter lenses have a positive M.
- A lens with a positive M cannot be used alone, and must be used in combination with a lens with a negative M.
- When using a CCTV lens with a magnification of M, the lens extension amount isX'becomes.
distortion
- f
- Focal length
- FF
- front focus
- FF'
- back focus
Positive values of D result in pincushion distortion and negative values result in barrel distortion.
TV distortion (DTV) is often less than 1/3 of the optical distortion (D).