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Old 02-11-2019, 08:35 AM
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rcheshire (Rowland)
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FS60C flat field

This is for Takahashi FS60C owners - if there are any on this forum?

Not sure of the experience of others with the f/6.2 flattener (not the more recent multi-flattener) and use with consumer digital cameras. But referencing the configuration in the FS60C system chart, I found it impossible to obtain a flat field.

A little bit of forum reading tends to indicate the same.

The previous owner, an IIS member, made up a wider T-Mount front section (it comes in two bits). The difference of several millimeters made all the difference - see attached GIF.

Thanks JG.

Note: the GIF images are of the top right corner of the frames but not the same star field - that would be too organised.
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Click for full-size image (takflat.gif)
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Last edited by rcheshire; 03-11-2019 at 04:09 AM.
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Old 02-11-2019, 11:56 AM
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Atmos (Colin)
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That’s a big improvement!
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Old 02-11-2019, 01:30 PM
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Slawomir (Suavi)
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Very nice correction
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Old 03-11-2019, 04:08 AM
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rcheshire (Rowland)
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There is a little degradation resizing the GIF and possibly due to random sampling error in the single sub but otherwise a significant and usable improvement.
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