Announcement: Askar 71F - Flatfield Astrograph / Observation Telescope
With the 71F, Askar offers a lightweight, compact, and affordable four-lens flat-field astrograph that can be used for visual observations and astrophotography.
The Askar 71F has an aperture of 71 mm, a focal length of 490 mm, and a native aperture ratio of f/6.9.
The lens is an air-gapped APO lens design, including ED glass to effectively reduce chromatic aberration. It supports sensors up to 44 mm diagonal.
The Askar 71F is a true flat-field APO. You don't need to maintain a specific sensor distance from the connection thread or corrector, as these are already built into the tube. Once the camera is in focus, the field is automatically corrected for astrophotography.
Subsequently adding a filter is also no problem; you just need to refocus.
https://www.teleskop-spezialisten.de/shop/Teleskope/ED-APO/bis-80mm/Askar-71F-71mm-490mm-f/6-9-Quadruplet-Flat-Field-Astrograf-Beobachtungsfernrohr::6953.html
Of course, we also inspect each unit again before it is delivered to the customer to ensure the best possible experience immediately upon receipt.







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Specifications
Aperture
71mm
Focal Length
490mm
Focal Ratio
f/6.9
Lens
Quadruplet Air-Spaced APO (with one ED glass)
Image Circle
44mm
Maximum Accessories
(Sensor Distance to Thread,
OAZ Fully Retracted)
Photography:
82.5mm (from M48×0.75 thread)
100.5mm (from M54×0.75 thread)
Observation:
117mm (from 1.25" eyepiece holder)
127mm (from 2" eyepiece holder)
Total Length
372.5mm (including 1.25" adapter, dew shield retracted)
430.9mm (including 1.25" adapter, dew shield extended)
415mm (including camera adapter, dew shield) retracted)
473.4mm (including camera adapter, dew shield extended)
Net weight (tube only)
2.5kg
Gross weight (including ring clamps & dovetail rail)
3.0kg
Camera connection thread:
M64×0.75-M54×0.75
M54×0.75-M54×0.75
M54×0.75-M48×0.75 (with M48×0.75 filter thread, internal)
Scope of delivery:
A 71F OTA, tube clamps, handle/accessory rail, Vixen 230mm dovetail rail, camera adapter for photography, 1.25" 45° angle prism, 1 x 1.25" 8mm eyepiece, 1 x 1.25" eyepiece