| This fully multicoated field flattener is designed specifically for medium format (6x7) photography with the 4” focuser Takahashi TOA-130F and TOA-150 refractors. With the TOA-130F, it provides a 5.3° flat field image over a 90mm diameter circle. With the TOA-150, it provides a 4.82° flat field image over the same 90mm diameter circle. Images taken with medium format cameras show pinpoint star images from one corner of the field to the other, with 60% of the field fully illuminated. The field flattener threads into the 4” focuser drawtube, after removing the coupling ring that connects to the 2” eyepiece holder of the scope. An optional T-mount for 6x7 cameras (#TFP2840 for the Pentax 6x7 and #TCA0200 for the Mamiya 645) threads directly onto the field flattener and your camera attaches in turn to the T-mount. |
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