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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.

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$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 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
$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

ASK-ASKAR131FRD

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

ASK-ASAPO131F

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 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 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
$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
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