Some thing about telelens DC

A telelens is a  long-focus lens in which the physical length of the lens is shorter than the focal length.
Although telelens DC has many advantages, it will require more skills, higher quality of big zoom lens and higher ability to resist dispersion.

I will introduce some well known model.

1.Sony Cyber-shot H1

Cyber-shot H1 is Sony's attempt to win a share of one of the fastest growing digital camera market sectors, the 5 megapixel 'super zoom'. Although Sony has produced big zoom cameras before, the H1 is the electronics giant's first foray into compact, big zoom image-stabilized cameras. As well as a huge 12x optical zoom the H1 is a real treasure chest of photographic control, offering a wealth of automatic, semi automatic and manual exposure modes, a big 2.5" screen and captures VGA/30fps movies in space-efficient MPEG format.

·                     5.1 effective megapixels

·                     36-432mm equivalent (12x optical) F2.8-3.7 zoom lens

·                     2.5” LCD (115,200 pixels)

·                     Full photographic control

·                     Optional wide and tele lens converters

·                     Scene selection (7 modes)

·                     32MB internal memory, plus a Memory Stick/PRO slot

 2.Canon PowerShot S2 IS

 S2 is no 'minor upgrade' - almost every aspect of the S1's specification and performance has been improved or refined, the body is entirely new and some of the most serious problems found on the original model have been addressed.

·                     12x optical zoom (36-432mm equiv.)

·                     5.0 million effective pixels

·                     1.8-inch tilt-and-swivel LCD monitor

·                     Color electronic viewfinder

·                     Optical Image Stabilizer (3 modes)

·                     Ultrasonic motor (USM)

·                     Extra-long movie mode with enhanced VGA resolution and stereo sound

·                     Canon DIGIC II processor with iSAPS

·                     PictBridge and Canon Direct Print compatible – no PC required

·                     Six new 'special scene' shooting modes 

3.Panasonic Lumix DMC-FZ5

FZ5 has a range of relatively minor changes over the FZ3, including longer battery life, a repositioned shutter release and improved grip design, larger LCD screen, orientation sensor and a new fast focus mode, which Panasonic claims gives a 30% improvement on the previous model.

·                     5.0 million effective pixels

·                     36 - 432mm (equiv.) F2.8-3.3, 12x Leica DC VARIO-ELMARIT Zoom Lens

·                     Mega O.I.S (optical image stabilisation)

·                     New orientation sensor

·                     Venus II image processing engine

·                     9 scene modes and full photographic control

·                     TIFF mode

·                     Ultra-fast startup, focus, shutter lag and shot-to-shot time

·                     'Simple' mode for novice photographers

4.Konica Minolta DiMAGE Z5

 Latest addition to the big-zoom DiMAGE Z range to feature the CCD-shifting Anti-Shake system seen on the A2/A200 and Maxxum 7D Digital SLR. Aside from a 5MP sensor and a couple of minor specification tweaks, the DiMAGE Z5 is almost identical to the Z3.

·                     12x optical Mega Zoom and 4x digital zoom

·                     CCD-shift Anti-Shake System

·                     Fastest-in-class*1 Rapid AF with Predictive Focus Control

·                     5.0-megapixel CCD

·                     CxProcess III image processing technology

·                     High-resolution, shake-free VGA movies

·                     Large 2.0-inch LCD, compact body, and fast response

·                     Super Macro mode for shooting subjects as close as 1 cm from the lens