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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.

Askar F Flat-Field Astrographs

The Askar F series are flat-field apochromatic refractors designed for astrophotography without a separate flattener. The line runs from the compact 60F and the 71F quadruplet at f/6.9 to the 91F, 111F and 131F, so you can pick a focal length for wide nebula fields or smaller galaxies.

Each model has a dedicated reducer, 0.75x for the 60F, 71F and 91F and 0.74x for the 111F and 131F, for a faster focal ratio and a wider field when you need it.

Filters

$659.00 - $659.00
$659.00
$659.00 - $659.00
$659.00

Askar 71F Quadruplet Flat-Field APO f/6.9

ASK-ASAPO71F
1 in stock

71mm Aperture Quadruplet APO Optical Design 490mm Focal Length at f/6.9 44mm Full-Frame Corrected Image Circle Integrated Field Flattener 3.0kg To...

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$659.00 - $659.00
$659.00
$659.00 - $659.00
$659.00
$208.00 - $208.00
$208.00
$208.00 - $208.00
$208.00

Askar 0.75x 71F Reducer

ASK-ASKAR71R
1 in stock

0.75x Reduction Factor Transforms Askar 71F to f/5.2 New Focal Length: 369mm Standard 55mm Back Focus Triplet Optical Design Description FAQ Sp...

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$208.00 - $208.00
$208.00
$208.00 - $208.00
$208.00
Askar 60F 0.75x Reducer
$199.00 - $199.00
$199.00
$199.00 - $199.00
$199.00

Askar 60F 0.75x Reducer

ASK-ASKAR60R

0.75x Focal Reduction Reduces Focal Length to 311mm Creates a Fast f/5.1 Focal Ratio 44mm Full-Frame Image Circle Standard 55mm Back Focus Triplet...

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$199.00 - $199.00
$199.00
$199.00 - $199.00
$199.00
Askar 91F 0.75x Reducer
$199.00 - $199.00
$199.00
$199.00 - $199.00
$199.00

Askar 91F 0.75x Reducer

ASK-ASKAR91R

Reduces focal ratio to a fast f/5 0.75x reduction factor for wider fields of view Triplet optical design provides field-flattening correction Stan...

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$199.00 - $199.00
$199.00
$199.00 - $199.00
$199.00
Askar 91F Flat-Field Astrograph
$999.00 - $999.00
$999.00
$999.00 - $999.00
$999.00

Askar 91F Flat-Field Astrograph

ASK-ASAPO91F

91mm Aperture Quadruplet APO Optics 609mm Focal Length at f/6.7 44mm Full-Frame Corrected Image Circle Integrated Field Flattener Design 3.92kg Ne...

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$999.00 - $999.00
$999.00
$999.00 - $999.00
$999.00
$1,499.00 - $1,499.00
$1,499.00
$1,499.00 - $1,499.00
$1,499.00

Askar 111F Flat-Field Astrograph

ASK-ASKAR111F
1 in stock

111mm Aperture Quadruplet APO Optics 766mm Focal Length at f/6.9 44mm Full-Frame Corrected Image Circle Integrated Field Flattener Design 5.74kg N...

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$1,499.00 - $1,499.00
$1,499.00
$1,499.00 - $1,499.00
$1,499.00
Askar 131F 0.74× Reducer
$299.00 - $299.00
$299.00
$299.00 - $299.00
$299.00

Askar 131F 0.74× Reducer

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Reduces telescope focal ratio to f/5.6 Achieves a 733.6mm final focal length Triplet optical design for field flattening Standard 55mm back focus ...

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$299.00 - $299.00
$299.00
$299.00 - $299.00
$299.00
Askar 131F Flat-Field APO Refractor
$1,999.00 - $1,999.00
$1,999.00
$1,999.00 - $1,999.00
$1,999.00

Askar 131F Flat-Field APO Refractor

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131mm Aperture f/7.5 Focal Ratio Quadruplet Air-Spaced APO Optical Design Includes one ED Glass Element 44mm Full-Frame Image Circle Integrated Fi...

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$1,999.00 - $1,999.00
$1,999.00
$1,999.00 - $1,999.00
$1,999.00
Askar 111F 0.74× Reducer
$299.00 - $299.00
$299.00
$299.00 - $299.00
$299.00

Askar 111F 0.74× Reducer

ASK-ASAPO111R
1 in stock

Reduces Telescope Focal Ratio to f/5.1 Creates a 566mm Focal Length Imaging System Triplet Optical Design for Field Flattening Provides Standard 5...

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$299.00 - $299.00
$299.00
$299.00 - $299.00
$299.00
Askar 60F Flat-Field Astrograph
$499.00 - $499.00
$499.00
$499.00 - $499.00
$499.00

Askar 60F Flat-Field Astrograph

ASK-ASAPO60F
1 in stock

60mm Aperture Quadruplet APO Optics 408mm Focal Length f/6.8 Native Focal Ratio 44mm Full-Frame Image Circle Integrated Field Flattener 2.86kg Gro...

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$499.00 - $499.00
$499.00
$499.00 - $499.00
$499.00