4" TEC Field Flattener for 140 / 160 / 180 / 200 APO

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4" TEC Field Flattener for 140 / 160 / 180 / 200 APO

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€ 975.00 Price excl. German VAT tax (19%): € 819.33

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  • Is specifically designed for the APO140 / 160 / 180 / 200 F/7
  • Corrects field curvature and off-axis astigmatism, designed especially for use with large format cameras
  • Back focus distance of 85mm from flange to the focal plane
  • The edge of field distortion is less than 0.5%
  • With Pentax 6x7 Bajonett Adapter

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€ 975.00 Price excl. German VAT tax (19%): € 819.33

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Could you please tell me if this field flattener would work with TEC 140 ED? If yes, how long is the estimated wait time for it to be in stock again?
Question by: Chris King on Oct 3, 2022 9:04:00 PM | 1 Answer(s)

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Ruediger 12/01/2020 13/01/202019:50
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Pinpoint stars all over the field
I have just received the FF for my TEC 140 ED and I am enthusiastic!

Currently I am using an ATIK 16200 with an APS-H Sensor and have pin point stars over the complete FOV. It is so precise that it reveals any other flaw in your image train very quickly. e.g. having a slight sensor tilt. All connections are absolute solid and tight. In combination with a the quick release there is no bending or shifts.
Like all flatterers it is absolute mandatory to keep correct working distance of 85 mm on the millimeter.

I observed a slight increase of focal length from 980 mm to 1016 mm (both measured).

First 2 pictures showing the the image train on the TEC.
Last is showing 1:1 scaled corner view of an image taken with ATIK 16200, Lum, 30s, Binning 1 (very poor seeing, foggy and very flickering), 4499x3599, Pixel size 6nm
  • Outstanding optical performance
  • heavy, but unavoidable at this diameter
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