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Optical thickness: -65.5 mm (1)

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75% (2)
77% (2)
79% (1)
80% (23)
81% (6)
82% (1)
83% (5)
84% (1)
87% (3)
89% (2)
90% (7)
91% (17)
92% (3)
>77% @ 1200 nm (2)
>80% @ 1200 nm (2)
~61% (14)
~64% (2)
~65% (5)
~66% (9)
~77% peak QE for Monochrome (QHY174M GPS) | ~62% peak QE for Colour (QHY174C GPS) (1)
~80% (11)
~91% (11)

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2" (64)
31 mm (24)
36 mm (28)
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0.2 - 0.8 Å depending on configuration (1)
2.5 nm (4)
3 nm (15)
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4 nm (6)
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5 nm (2)
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7 nm (6)
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9 nm (1)
11 nm (1)
20 nm (3)
25 nm (1)
60 nm (1)
3.5 - 4 nm / 6.5 nm (3)
~0.5Å (3)

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Apparent FOV

40 - 60° (1)
44° (1)
48° (6)
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50° (8)
52° (3)
56° (3)
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68° (9)
70° (1)
72° (2)
75° (1)
76° (6)
80° (1)
82° (6)
84° (1)

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Barrel size

1.25" (67)
2" (35)

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Colour or Monochrome

Colour (59)
Monochrome (70)
QHY174M: Monochrome, QHY174C: Colour (1)

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Cooled

Active cooling (36)
Cooled (49)
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No (8)
Non-cooled (28)
None (QHY174 GPS models are not cooled) (1)
TEC cooled (ΔT of 35°C) (1)

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