This telescope is inspected, measured and adjusted if necessary. The focuser will be optimized. On request from your telescope, you will receive a meaningful quality certificate (test protocol with star test, Ronchi, adjustment, with individual serial number)! Please specify when ordering!

Examples of our test protocols: Test records
How we adjust: About us

Please contact for advice on this telescope. So you can benefit from our experience before buying.

William Optics Gran Turismo GT 153 AP 153/1188 OTA apochromatic refractor

Illustration similar: Delivery without finderscope!



The large triplet apochromat GT153 for full-frame cameras: FPL-53 glass for high color correction, crisp image and excellent resolution thanks to the relatively large aperture - a dream for astrophotographers! To achieve this performance, each lens is tested with a Zygo interferometer and then inserted into the precise CNC-milled lens frame. Faulty lens frames often undermine the possible performance of the lenses in cheap refractors. It is worth investing in the excellent finish from William Optics here!

The 3.5 "feather touch focuser is up to the high demands of demanding astrophotographers: soft focus, no slipping or image shift, 360 ° rotatable and of course stocky.

The scope of delivery includes a Bahtinov mask specially developed by William Optics, with which focusing is optimally successful. Also included is the 3 "RotoLock, with which all accessories can be clamped securely and in the center.



Technical specifications:

optics

type refractor
Type Apochromat Triplet
Opening (mm) 153
Focal length (mm) 1188
Opening ratio (f /) 7.8
Resolving power (arc seconds) 0.9
Limit size (mag) 12.7
Light collecting ability (-fold a 7mm pupil) 480
Max. Sensible enlargement (-fach) 306
compensation STM
Transport length (mm) 1100
Tube weight (kg) 13.5
Okularauszug

Type Starlight FeatherTouch
Free opening (mm) 89
Rotating yes
Ring clamp yes
mount

type OTA
Mount type without mount
Included accessories

Taukappe yes
No carrying case
Other Bahtinov focus mask
Viewfinder without
Dovetail Losmandy-Style
Pipe clamps Yes
Generally
Gran Turismo series
Red color
application areas

Astrophotography yes
Moon & planets yes
Nature observation no
Nebulae & galaxies yes
Sun no (only with a suitable sun filter)
Recommended for ...

beginners no
advanced yes
Observatories yes