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The flattener is an arrangement of lenses that flatten the image field, as this is slightly curved by the primary optical system. This curvature causes stars to appear less sharp toward the edge of the field of view on photographic images. The flattener, also known as a field flattener lens, corrects this error.

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Celestron Reducer 0.63x / Corrector
Celestron
Reducer 0.63x / Corrector
( 4.5 / 5 )
$ 166.00
ready for shipping in 24 h
Omegon Field Flattener 2''
Omegon
Field Flattener 2''
( 4 / 5 )
$ 259.00
ready for shipping in 24 h
William Optics Adjustable Flattener Reducer Flat6AIII
William Optics
Adjustable Flattener Reducer Flat6AIII
$ 415.00
ready for shipping in 24 h
William Optics Flattner Flat61A for Z61
William Optics
Flattner Flat61A for Z61
$ 322.00
ready for shipping in 24 h
TS Optics Photoline 1.0x Generation II
TS Optics
Photoline 1.0x Generation II
RRP:  $ 415.00
Our price:
$ 384.00
ready for shipping in 1-2 weeks
William Optics Flat GT
William Optics
Flat GT
$ 311.00
ready for shipping in 3-5 weeks
Omegon Pro Field Flattener 2,5"
Omegon
Pro Field Flattener 2,5"
$ 299.00
ready for shipping in 24 h
William Optics Flattener Flat73A for ZenithStar 73
William Optics
Flattener Flat73A for ZenithStar 73
$ 322.00
ready for shipping in 24 h
Skywatcher Flattener 0.85x EvoStar 72 ED
Skywatcher
Flattener 0.85x EvoStar 72 ED
$ 311.00
ready for shipping in 24 h
Skywatcher Flattener Evoguide 50ED
Skywatcher
Flattener Evoguide 50ED
$ 120.00
ready for shipping in 1-2 weeks
Explore Scientific ES MPCC Field Flattner ED APO + Canon EOS T2
Explore Scientific
ES MPCC Field Flattner ED APO + Canon EOS T2
RRP:  $ 151.00
Our price:
$ 76.00
ready for shipping in 24 h
Explore Scientific Reducer/Corrector 3" 0.7x
Explore Scientific
Reducer/Corrector 3" 0.7x
$ 436.00
ready for shipping in 24 h
Skywatcher Evolux 62ED 0.9x flattener
Skywatcher
Evolux 62ED 0.9x flattener
$ 332.00
ready for shipping in 24 h
Skywatcher Flattener 0.77x Esprit 120 ED
Skywatcher
Flattener 0.77x Esprit 120 ED
$ 442.00
ready for shipping in 24 h
Askar Flattener 1.0x Full-Frame 185APO
Askar
Flattener 1.0x Full-Frame 185APO
$ 415.00
ready for shipping in 3-5 weeks
TS Optics Flattener/Reducer 0.8x AP 102/714
TS Optics
Flattener/Reducer 0.8x AP 102/714
$ 207.00
ready for shipping in 1-2 weeks
TS Optics Flattener/Reducer 0,8x AP 80/560
TS Optics
Flattener/Reducer 0,8x AP 80/560
$ 207.00
ready for shipping in 1-2 weeks
Artesky Reducer/Field Flattener 0.8x
Artesky
Reducer/Field Flattener 0.8x
$ 239.00
ready for shipping in 24 h
TS Optics Flattener/Reducer 0.8x CF-APO 102
TS Optics
Flattener/Reducer 0.8x CF-APO 102
$ 468.00
ready for shipping in 24 h
Skywatcher Flattener Esprit-120ED M48
Skywatcher
Flattener Esprit-120ED M48
$ 363.00
ready for shipping in 24 h
APM Riccardi Flattener Model 1
APM
Riccardi Flattener Model 1
$ 520.00
ready for shipping in 24 h
Explore Scientific Flattener ED80 & ED102
Explore Scientific
Flattener ED80 & ED102
RRP:  $ 186.00
Our price:
$ 135.00
ready for shipping in 1-2 weeks
William Optics Adjustable Flattener Reducer Flat7A
William Optics
Adjustable Flattener Reducer Flat7A
$ 820.00
ready for shipping in 3-5 weeks
William Optics Full-Frame Flattener/Reducer 0.72x
William Optics
Full-Frame Flattener/Reducer 0.72x
$ 930.00
ready for shipping in 3-5 weeks
William Optics Flat6A III Special Edition FLT91
William Optics
Flat6A III Special Edition FLT91
$ 570.00
ready for shipping in 3-5 weeks
TS Optics Flattener 1.0x M63
TS Optics
Flattener 1.0x M63
$ 310.00
ready for shipping in 3-7 days
Skywatcher Esprit-150ED M48 field flattener
Skywatcher
Esprit-150ED M48 field flattener
$ 432.00
ready for shipping in 1-2 weeks
TS Optics Reducer Flattener Photoline 0,8x 2" for 80ED f/7 APO
TS Optics
Reducer Flattener Photoline 0,8x 2" for 80ED f/7 APO
$ 182.00
ready for shipping in 3-7 days
TS Optics Reducer/Corrector Photoline 0,79x 3"
TS Optics
Reducer/Corrector Photoline 0,79x 3"
$ 415.00
ready for shipping in 3-7 days
Skywatcher 0.85x Focal Reducer/Corrector for Evostar-80ED DS-PRO
Skywatcher
0.85x Focal Reducer/Corrector for Evostar-80ED DS-PRO
$ 311.00
ready for shipping in 1-2 weeks
Skywatcher Flattener Esprit-100ED M48
Skywatcher
Flattener Esprit-100ED M48
$ 276.00
ready for shipping in 1-2 weeks
TS Optics corrector for RC telescopes, 2"
TS Optics
corrector for RC telescopes, 2"
$ 259.00
ready for shipping in 3-7 days
Skywatcher Flattener 0.85x EvoStar 150 ED
Skywatcher
Flattener 0.85x EvoStar 150 ED
$ 311.00
ready for shipping in 1-2 weeks
William Optics Flattener Flat68III
William Optics
Flattener Flat68III
RRP:  $ 840.00
Our price:
$ 790.00
ready for shipping in 3-5 weeks
Tecnosky Variable Flattener 1.0x Full Frame
Tecnosky
Variable Flattener 1.0x Full Frame
$ 311.00
ready for shipping in 1-2 weeks
Lacerta Universal Field Flattener 2"
Lacerta
Universal Field Flattener 2"
$ 228.00
ready for shipping in 1-2 weeks