Technical Glossary
A signal can be influenced by undesirable disturbances (electric fields, light reflections originating from the incidence of light on a photosensitive picture sensor etc.). The signal-to-noise ratio (often abbreviated SNR or S/N) quantifies how much a signal has been corrupted by noise. Image noise is particularly an issue under low-light conditions and with longer shutter speeds.
The image plane is the area within a camera where the subject is captured as a sharp image. With analogue cameras the image plane is equal to the film plane, with digital cameras it is equal to the image sensor.
In digital photography images are stored on a digital storage medium using an electronic image converter (picture sensor). There are two types: CMOS (Complementary Metal Oxide Semiconductor) chip sensors which use less electricity, are quick and generate little heat and CCD (Charge Coupled Device) chips which uses more energy, but however delivers a better image quality.
This is a special Tamron development. The Integrated Focus Cam positions the lens elements of the respective lens precisely in the right position (= Internal Focusing System) and guarantees exact and quick sharpness in every situation.
Lenses of customary design have a front lens group which shifts when focusing. Internal focus lenses reach the sharp position by shifting (an) inner lens element(s). Here Tamron has developed the so-called
Integrated Focus Cam which allows quick and exact focusing. Moreover, the
MFD can also be reduced with the internal focusing, as well as image defects like vignetting. Another advantage is the stationary focus-ring regardless of the zoom position. The front element of the lens also does not turn which is important when using filters which dependent on direction (e.g., polarization filters).
Lenses with
IF:
Di II Lenses
SP AF10-24mm F/3.5-4.5
Di II
LD Aspherical [
IF]
SP AF 17-50mm F/2,8
VC
XR
Di II
LD Aspherical [
IF]
SP AF 17-50mm F/2,8
XR
Di II
LD Aspherical [
IF]
AF 18-200mm F/3,5-6,3
XR
Di II
LD Aspherical [
IF] MACRO
AF 18-250mm F/3,5-6,3
Di II
LD Aspherical [
IF] MACRO
AF 18-270mm F/3,5 -6,3
Di II
VC
LD Aspherical [
IF] Macro
Fixed
Focal Length
SP AF60mm F/2.0
Di II
LD [
IF] Macro 1:1
Di Lenses
SP AF 28-75mm F/2,8
XR
Di
LD Aspherical [
IF] MACRO
AF 28-200mm F/3,8-5,6
XR
Di Aspherical [
IF] MACRO
AF 28-300mm F/3,5-6,3
XR
Di
LD Aspherical [
IF] MACRO
AF 28-300mm F/3,5-6,3
XR
Di
VC
LD Aspherical [
IF] MACRO
SP AF 70-200mm F/2,8
Di
LD [
IF] MACRO
SP AF 200-500mm F/5-6,3
Di
LD [
IF]
Fixed
Focal Length
SP AF 180mm F/3,5
Di
LD[
IF] MACRO 1:1
