ED 80500(APO) OTA aperture:80mm(f/6.25) lens:FPL53,FMC 2" crayford no pinion dual speed focuser(2"to 1.25" adapter include)

detailed product description

80ED dual speed:high quality ED refractor for observing,imaging and guiding

.high quality apochromatic doublet           .lens type:FPL-53 fluorite doublet

.coating:broadband FMC                        .lens diameter:80mm

.focal ratio:f6.25                                     .robust,all-metal construction

.metal knife-edge baffles                         .retractable dew shield

.mounting rings(with 1/4" photo/c thread)  .quality nylon,padded travel-case or aluminum case

.tube weight(inc rings):2.5KG                   .minimum tube length:385mm with retracted dew-shield

.maximum tube length:465mm with extended dew-shield

.focuser:two speed(1:10)precision,adjustable

.focuser adapter:accepts 2" and 1.25" eyepiece and diagonals

The 80500 ED APO uses higher quality FPL53 fluorite glass rather than the FPL52 or FPL51 types.

FPL53 fluorite glass suppresses chromatic aberration and is very well suited for short focal lengths unlike the FPL52 or FPL51 types.The optical tube greatly benefits from metal knife-edge baffles that prevent stray light outside the field of view from reaching the focal plane.Knife-edge baffles markedly increase image contrast.

The dual speed crayford type focuser,main tube and lens assembly are screwed into each other for maximum rightly,no peripheral screws are used as they can compromise the rigidity of the telescope.This eliminates movement and ensures orthogonality.

80500 ED APO refractor telescope