SKU:66997445695
Askar 91F APO Refractor (91 mm f/5.6 Flat-Field) – Dark Clear Skies
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- USA
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- USA
- CAN
Ships within 48 hours · Estimated delivery Aug 15 - Aug 20
Description
Askar 91F APO Refractor (91 mm f/5.6 Flat-Field) – Dark Clear SkiesAskar 91F Flat Field APO Astrograph The Askar 91F is a powerful 91 mm f 5. 6 flat field apochromatic refractor designed for deep sky astrophotography. With its FRA series Petzval optical design, the 91F delivers a native flat field and pinpoint stars across APS C and full frame sensors without needing an additional field flattener. Key features Aperture: 91 mm APO optics with ED glass. Focal length: 500 mm at f 5. 6 balanced between wide field and
Adjustable Height:
and surface granulation with exceptional detail
With its extremely narrow bandpass focused on the two OIII lines
Dynamic lens focusing system
It dramatically simplifies cable management and makes portable astrophotography quicker to set up
the Extender PH kit achieves an exceptional light transmission rate of 99
and a native focal ratio of F6
not only it comes with central threaded holed and slots
The lens-group diagram shows the front SD triplet and rear Petzval doublet
Compact Design: Lightweight and compact
High sensitivity microphone
low noise performance
Quick Dispatch:
Your Askar 91F APO Refractor (91 mm f/5.6 Flat-Field) – Dark Clear Skies orders ship within 1-2 business days.
Delivery Options:
- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
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You'll receive a tracking link by email once your Askar 91F APO Refractor (91 mm f/5.6 Flat-Field) – Dark Clear Skies ships.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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