Askar ACL200 Camera Lens User Manual
- October 27, 2023
- Askar
Table of Contents
Askar ACL200 Camera Lens
WARNING!!
NEVER VIEW THE SUN THROUGH THE TELESCOPE. THIS WILL CAUSE INSTANT BLINDNESS TO THE EYE. PLEASE PURCHASE A SPECIAL SOLAR OBSERVATION FILTER FOR THE SAFEST OBSERVATION GUIDANCE. THROUGH THE FINDERSCOPE WILL ALSO CAUSE SERIOUS DAMAGE TO THE EYE. PLEASE KEEP CHILDREN AWAY FROM THE SCOPE DURING THE DAY
Instructions for use
This lens is optimized designed specifically for astrophotography, meanwhile,
it meets the landscape photography requirement. It is excellent quality,
lightweight and simple to use. This is exactly a groundbreaking product that
perfectly combines the use of telescope and telephoto camera lens. Using this
lens for deep-sky imaging , it w ill produce clear and sharp images that have
a very minimal amount of distortion and chromatic aberration, the resulting
astrophotos are of high quality.
This lens helps you unlock your creative potential and offer more photographic
possibilities.
This lens features three-group and six-element optical design including two
extra-low dispersion ( ED ) lens elements, thus the effect of chromatic
aberration is minimized and surpasses general lens wit h its high image
quality.
Lens Structure
Rear Lens Connection Part
- The rear side is M48x0.75 Male thread adapter, can install many kinds of camera adapter ring, easy to screw onto many brands of camera.
- The calculation of back focus from the end thread face is 55mm as most lens have, when using different cameras, please pay attention to the flange focal distance and adapter depth (or thickness) between cameras and lens mounts, so that the distance indicator can work correctly.
For instance: Canon SLR camera has a flange focal distance of 44MM, adapter depth is 44MM , then the back focus is 44MM+11MM=55MM.
Camera Connection Diagram
The back focus
starting from the M48X0. 75 thread is 55mm (excluding the thread length ).
-
It also can be used from 40-57mm, but the distance scale will not be correct.
- If you need to attach professional astro camera and other accessories such as filter w heel , etc. please contact the relevant manufacturer for attachment guidance.
Specification
Focal length :200mm
Specification: Full frame
Lens Construction: Three-group and six-element
Aperture blades: 10 pieces
Minimum aperture: 22
Closest focusing distance: About 3m
Focus mode: Manual focus
Focus type: Coarse adjustment and Micro adjustment
Micro-motion distance: 1mm
Filter diameter: 82mm
Maximum diameter & length: About CD 100x195mm
Weight:1.8kg
Lens Filter Connection Diagram
Lens External Components
Diagram of Back Focus
Focusing
This lens adopts coarse adjustment and micro adjustment in manual focus mode, for achieving accurate focus by micro adjusting the focus .
Coarse adjustment
After attaching the camera, slowly turn the coarse adjustment ring until the subject comes into general focus , it is easy and quick focus in landscape photography.
Micro adjustment
By turning the focus adjustment ring based on coarse focusing , yo u can micro-adjust the subject. This is especially effective for night sky and star photography, and it is usually works with the screen magnification display function that most cameras have today, can accurately point at the focus . It offers sharp and crisp image .
Aperture Use
This lens is a professional lens for astrophotography, but it also designed for landscape photography. The re – fore , the aperture component rarely seen in astronomical telescopes is added, which adjust your aperture to maintain correct exposure and control depth of field with F4-F22 aperture.
Dew-shield
The dew-shield is a standard accessory to shelter the lens from stray light . To install , screw the dew-shield on the lens .
Focus Distance Display
The focus distance of this camera is 3 meters to infinity.
When back focus is correct, distance display is correct. When back focus is
not at 55MM, the distance display will be deviated, For relative reference
only.
Use of Dovetail Plate
This lens attached with 360 ° rotator and V IX EN standard dovetail plate, can easy to connect with most of the Equatorial mounts. This lens also features camera standard thread adapter (four 1 /4 -20UNC and one 3/8-16UNC) to connect most of camera tripods.
Maintenance
Avoid rain, splashing water and falling water. When storing, avoid high temperature or cold environment, avoid long-term exposure to the sun. Avoid shock.
Use a microfiber cloth to wipe the dust and keep it clean. Do not breathe upon the lens or wipe with your fingers . It is not recommended to use lens cleaning fluids containing irritating chemicals. Use a lens brush or professional blowing equipment for cleaning.
When the camera is not in use, yo u can put it back in the camera bag to keep it dry.
Documents / Resources
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Askar ACL200 Camera
Lens
[pdf] User Manual
ACL200 Camera Lens, ACL200, Camera Lens, Lens
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