Lens Comparison Table

Inter Comparison of Carl Zeiss Stereo Microscopes
Specification Zeiss
Stemi 305 Stemi 508 Discovery V8 Discovery V20
Optical Concept Greenough Greenough Parallel Optics Parallel Optics
Zoom Range 5:1 8:1 8:1 20:1
Zoom Operation Manual Manual Manual Motorized
Total Magnification with 1x Objectives and 10x eyepieces 8x to 40x 6.3x to 50x 10x to 80x 7.5x to 150x
Resolution(lp/mm) 200 220 346 796
Working distance with 1x Objective 110mm 92mm 81mm with Plan S1x Objective 81mm with Plan Apo S0.63x Objective
Binocular tubes Integrated Integrated Various Binocular/trinocular tubes are available 81mm with Plan Apo S0.63x Objective
Interpupillary Distance 55-75mm 55-75mm 55-75mm 55-75mm
Eyepieces 10X 10X 10X,16X,25X 10X,16X,25X
Field of View Number N/A 20 21,23,16,10 21,23,16,10
Object field(mm) 28.8...5 36.8...4.6 23.0...2.9 23.0...2.9
Accessories:
Camera Yes Yes Yes Yes
Fluorescence attachment No No Yes Yes
Inter Comparison of Carl Zeiss Stereo Microscopes
General Information(305) General Information(508)
Operation Concept Stereo microscope,Greenough design with 5:1 zoom range Stereo microscope,Greenough design with 8:1 zoom range
Main Component Lens body,Stand and Illumination Lens body,Stand and Illumination
Lens body Stemi 305(binocular, incl.eyepieces 10x/23 Br. foc),Stemi 305 doc(Phototube, incl.eyepieces 10x/23 Br. foc) Stemi 508(binocular, incl.eyepieces 10x/23 Br. foc),Stemi 508 doc(Phototube, incl.eyepieces 10x/23 Br. foc)
Stands Ergonomic design with adjustable in height and inclination for longer use Ergonomic design with adjustable in height and inclination for longer use
Input Power Supply 110 - 240 Volt AC,60/50 Hz 110 - 240 Volt AC,60/50 Hz
Optical data of the Basic and Optional System
Magnification Range 8x to 40x with basic version(10x eyepieces,no front optics)all magnifications from 4x to 200x (interchanable optics) 6.3x to 50x with basic version(10x eyepieces,no front optics)all magnifications from 2x to 250x (interchanable optics)
Maximum Resolution 200lp/mm basic version:up to 400lp/mm with interchanable optics 225lp/mm basic version:up to 450lp/mm with interchanable optics
Maximum object field 29 mm basic version;up to 58 mm using interchanable 36 mm basic version;up to 122 mm using interchanable
Working distance 110 mm basic version;up to 58 mm using interchanable optics 92 mm basic version;up to 122 mm using interchanable optics
Stand
Body Light weighted aluminium body
Focusing Manual coarse adjustment with Tilting arm
Illumination
Dark-field illumination Light weighted aluminium body