User Manual for Askar models including: 80PHQ Quadruplet Flat Field Astrograph, 80PHQ, Quadruplet Flat Field Astrograph, Flat Field Astrograph, Field Astrograph, Astrograph
9 mai 2022 — User s Manual. ， www.askarlens.com. Connection Diagram of Camera. Focuser. M76 male thread. M76-M48 four-piece adapters. Camera adapter ring.
80PHQ User s Manual ， English Instructions for use www.askarlens.com Product Size Diagram 80PHQ User s Manual ， www.askarlens.com Connection Diagram of Camera
80PHQ User s Manual f/4 and f/5 short focal ratios or f/10 and f/11 long focal ratios. So 80PHQ is a compact halfway house. The traditional long-focal-ratio astrographs are used only for observation due to the troublesome accessory connection. And those short-focal-ratio astrographs consistently suffer a lot from chromatic or spherical aberrations. As a great mixture, 80PHQ is equipped with a 4-piece adapter, convenient for users to connect different types of accessories. So it's a great helper in astrophotography. Besides, its special lens deign and powerful flatfield capacity make a crucial contribution to the high-quality imaging results, greatly reducing the impact of spherical and chromatic aberrations. 80PHQ is also a novice-friendly device. Keep in mind that the distance from the base of M68×1 to the focal plane is 155mm, and you can literally attach any accessories within this limit. You don't have to calculate your back focus distance which effectively simplifies the operation. 120mm 162mm Product Size Diagram M76×1 M68×1 M54×0.75 M48×0.75 Focal plane 20 20 13.5 115mm Total lengthObserving mode 450mmas lens hood contracted540mmas lens hood stretched Imaging mode 480mmas lens hood contracted570mmas lens hood stretched Connection Diagram of Camera M76 male thread Camera adapter ring Askar 80PHQ is a cost-effective refractor. It boasts special and fantastic vantages in both mechanical and optical design. As an f/7.5 refractor, it can function well by virtue of its flatfield ability and rigorous optical performance. Focuser M76-M48 four-piece adapters Camera Four-piece Adapters Diagram M68 to M54 photo adapter M76 to M68 photo adapter M54 filter extender M54 to M48 photo adapter (built-in 2" filter thread adapter) www.askarlens.com M76×1 13.5 M68×1 M68×1 M54×0.75 M54×0.75 M48×0.75 M54×0.75 M48×0.75 15.5 4.5 20 English Instructions for use Askar introduces the brand-new 80PHQ refractive astrograph. And it's the second long-focal-ratio astrograph from the PHQfamily. The overall finish of 80PHQ is evenly painted. A pair of clamshell-style tube rings tightly hold the OTA. There is a 3" rack-and-pinion rigorous focuser on the rear end of the telescope. It's a smooth focusing unit with dual-speed adjustment. 80PHQ's rotator is marked with precise graduation. 80PHQ inherits the optical design of the PHQ- family, adopting a 3+1 quadruplet lens structure which contains two pieces of ED glass that can effectively reduce chromatic aberration and enhance clarity and sharpness. It's worth mentioning that all astrographs from PHQ- family come with an integrated lens combination rather than simply placing three major lenses and acorrector together in a line. In another word, the whole optical system cannot solely perform without any piece of these lenses. This structure design leads to a more rational lens arrangement, better vignette control and superior image quality. At the first glance, Askar 80PHQ is much more compact. 80PHQ is 450mm in length and gross weight 4.7kg. So if your equatorial mount is not capable of holding heavy telescopes, or if you are quite tired of carrying a bulky long focal-ratio telescope around, then 80PHQ may be a great option. In terms of the optical design, 80PHQ is 80mm in its aperture diameter and 600mm in focal length. Thus its focal ratio is f/7.5. It's actually a medium focal ratio telescope compared with those Aperture size80mm Focal length600mm Focal ratiof/7.5 Objective lensQuadruplet air-spaced APO (including two ED glass) Image circle44mm Maximum accessory connection (with the focuser fully retreated) 1. Imaging mode: 115mmfrom the base of M48×0.75 male thread 135mmfrom the base of M54×0.75 male thread 155mmfrom the base of M68×1male thread 168.5mmfrom the base of M76×1 male thread 2. Observing mode: 148mmfrom the end of 2" eyepiece holder Total length 450mmincluding 1.25" eyepiece holder as dew shield contracted 540mmincluding 1.25" eyepiece holder as dew shield fully stretched 480mmincluding the 4-piece adapter as dew shield contracted 570mmincluding the 4-piece adapter as dew shield fully stretched Net weight3.9kg Gross weight4.7kg Rear-end thread type M76×1-M68×1 M68×1-M54×0.75 M54×0.75-M54×0.75 M54×0.75-M48×0.75M48×0.75 filter thread inside Standard package itemsan 80PHQ OTAa pair of tube rings, a handle, an Askar 300mm Vixen dovetail plate, a set of 4-piece photographic adapters, a manual Product Parts Diagram lens hood locking screw handle cap lens hood finder base rotator locking screw main tube M76 to 2"adapter 2" to 1.25"adapter multi-functional tube ring dovetail plate focuser focuser bottom locking screw coarse adjustment knob fine adjustment knob (opposite side) The Locking Screw Position Diagram Bottom locking screw Bottom locking screw Bottom load adjustment screw hole contains M4 small screws Remove the screws when using the EAF -screw holes all can be used for EAF bracket mounting 80PHQ focuser Items in 80PHQ Packaging 80PHQ User s Manual an 80PHQ OTAa pair of tube rings, a handle, an Askar 300mm Vixen dovetail plate, a set of 4-piece photographic adapters, a manual www.askarlens.com Instruction manualAdobe PDF library 15.00 Adobe Illustrator(R) 17.0