`Model·Focal Ratio

Focal length backfocus distance

Reducer f.ratio·focal    length·metal back focus

Flattener focal ratio·focal length·metal back distance

FS-60C F/5.9

354mm·143.9

F/4.5·283mm·72.3mm

n/a

FC-60E·F/8.1

500mm·173.5

F/5.9·354mm·72.3mm

n/a

FS-78·F/8.1

630mm·165.9

F/5.9·460mm·72.3mm

n/a

FS-102·F/8

820mm 194.5

F/5.9·602mm·83.9mm

n/a

FS-128·F/8.1

1040mm 198.7

F/5.9·755mm·83.9mm

n/a

FS-128F·F/8.1

1040mm218.5·

F/5.9·722mm·106.2mm

F/8.1·1020mm·106.2

FS-152·F/8

1216mm·218.5mm

F/5.9·897mm·106.2mm

F/8·1216mm·106.2

FSQ-106·F/5

530mm·120mm

Not needed

Not needed

SKY-90·f.5.56

500mm `170.5

F/4.5·405mm·72.2mm

same

BRC-250·F/5

1250mm·106.2mm

n/a

n/a

FCT-150·F/7

1050mm·309.0

F/5·750mm·102.45mm

n/a

E-160·F/3/4

544mm·56.0mm

n/a

n/a

E-210·F/3

630mm·62.8mm

n/a

n/a

E-250·F/3.3

825mm·84.2mm

n/a

n/a

E-300·F/3.6

1110mm·122mm

n/a

n/a

M-180·F/12

2160mm·133.0

F/9.3·1674mm·56.2mm

F/9.79·1763mm·56.2mm

M-210·F/11.5

2415mm·162mm

F/9.3·1956mm·56.2mm

F/9.34·1961mm·56.2mm

M-250·F/12

3000mm·156mm

F/9.3·2328mm·56.2mm

F/9.23·2307mm·56.2mm

M-300·F/11.9

3572mm·196mm

F/9.3·2790mm·56.2mm

F/9.30·2790mm·56.2mm

CN-212·F/12.4

2630mm·154mm

F/9.9·2099mm·56.0mm

n/a

CN-212·F/3.9

820mm·60.5mm

F/3.9·820mm·56.0mm

n/a

MT-130·F/6

795mm·91.0mm

F/4.7·611mm·56.0mm

*F/8.2·1060mm·56.0mm

MT-160·F/6.1

1000mm·93.0mm

F/4.8·776mm·56.0mm

*F/8.3·1330mm·56.0mm

MT-200·F/6

1200mm·87.0mm

F/4.8·970mm·56.0mm

*F/8·1600mm·56.0mm

TOA-130S/F

1000mm 83.5mm

F/5.8 580mm 8.9mm

F/7.7 1000mm 117.5mm [S]  [F]