TAKAHASHI FCT-L FLATTENER 0.99x

The Takahashi FCT-L Flattener is a 2-element 0.99x field flattener for FCT-114DF, FCT-114DS, FC-100DZ and FC-100DF refractors.

The reducer has an image circle of 55mm, giving well-corrected stars to the edge of a medium-format field. When paired with the FCT-114DF, relative illumination is approximately 100% at the edge of a full-frame sensor. With the FCT-114DS, this reduces to 90%, but is easily corrected with flat field calibration.

When paired with the FCT-114D series, the RMS spot diameter is 4.4 μm on axis and 5.8 μm at the edge of a full frame. With the FC-100DZ, the RMS spot diameter is 4.8 μm on axis and 7.2 μm at the edge of a full frame, with 93% illumination. With the FC-100DF, a slight chromatic halo originating from the objective lens remains. Relative illumination is approximately 90% at the edge of a full frame. 

Requires FCT-L CO Ring 114D for FCT-114DF, FCT-114DS and FC-100DZ, or FCT-L CO Ring 100DF for FC-100DF (both sold separately).

In order to connect the FCT-L to your image train, you will need to purchase the additional TKP00200 M72 x 1 - M48 x 0.75 adapter or TKA00201 M72 x 1 - M54 x 0.75 adapter (both sold separately). These can then be connected to the CO Ring to give a backfocus requirement of 55mm for the image train.

Specifications

Reduction factor	0.99 x
Backfocus	60.7 mm; 55 mm with optional M54 or M48 adapters
Image circle	55 mm
Connection telescope side	M72 x 1 male
Connection camera side	M72 x 1 male
Dimensions	Ø 78 x 35.5 mm
Weight	270 g
SKU	TK-TKA34582

 

FCT-L setup example with optional TKA00201 M72-M54 camera adapter.

 

FCT-L setup example with optional TKA00200 M72-M48 camera adapter.

 

FCT-L setup example with optional DSLR adapter.

 

Downloads

FCT-L Flattener system chart