The sensor of the E427 is an 11 megapixel, 4008 X 2672, full 35mm form factor (36.1mm X 24.0mm) with integrated electronic shutter.
The E427-i provides the highest resolution possible in color mydriatic fundus photography. Additional pixel resolution is not resolved due to the limitations of ocular media. In actual practice, the E427 offers just noticeable increase in resolution over the E3.
While FA’s may be performed at 11 mpixel resolution, it is not recommended, as the amount of light per pixel with normal excitation strobe power is sufficiently low as to compromise image quality. When used to perform FA’s, the E427-i may be binned to increase sensitivity at the expense of resolution. The binned resolution of just under 3 megabytes provides good quality and reasonable sensitivity. For the ultimate in image quality, a color E427 may be combined with a monochrome E3 (on fundus cameras which support 2 camera backs or if the backs are rotated between color and FA.
The E427 is available for most common fundus cameras.
Sensor |
Interline Transfer CCD |
Pixel Size |
9 µm square |
Max Resolution |
4008(H) x 2672 (V) ---- 10.7 megapixels |
Max Image Area |
36.1 mm (H) X 24.0 mm (V) ---- 43.4 mm diagonal |
Size |
3.25 Wide X 4 long X 1.5 deep (8.3cm X 10.2cm X 3.8 cm) |
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Note: Size does not include mating connectors and optics. |
Weight |
14oz (.4 Kg) |
Environmental |
Operating: 0-30C non-condensing |
Storage |
-10-50C non-condensing |
Power |
Supplied through IEEE 1394 interface |
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10-24 V DC Conforming to IEEE 1394 specification |
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Nominal 5 watts, Max 7 Watts on read-down |
Hardware Trigger input |
Input for trigger: 2-Pin Lemo Connector |
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Trigger on Low transition (TTL logic level) |
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Integration completes on return to high |
Strobe Trigger output |
PC connector, Nikon type with screw threads |
Indicators |
Single Green/Red LED |
Green |
Enabled and ready to capture |
Red |
Busy---not ready to capture |
S/N |
66 dB at base gain |
Live Focus |
Supported at all binning modes |
Binning |
1X, 2X, 4X |
Color |
Monochrome or RGB Bayer pattern |
User controls |
Power switch only. All controls through software |
Gain |
Software controlled preamp with 4X range |
Read down time |
.7 seconds (includes transfer to host computer) |
Bits per color(mono)/total |
ADC: 14/46 Mapped:12/36 File: 16/48 |
File Sizes |
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RAW (.DNG) |
Monochrome/Bayer: 22 megabytes (uncompressed, unpacked) |
Color Wheel: 66 megabytes |
Monochrome/Bayer: <10 megabytes, (typical, lossless compression) |
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TIFF (Uncompressed) |
11 megabytes mono / 33 megabytes color at 8 bits/color |
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22 megabytes mono / 66 megabytes color at 16 bits/color |
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JPG |
< 4 megabytes Mono / < 15 megabytes color visually lossless compression |
Host Cameras |
Most Technical and mechanical medium format camera bodies |
Connectivity |
IEEE 1394, 400 Mbit/second (FireWire) |
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Host computer requirements |
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Operating System |
Windows Vista, XP, or 2K : Professional recommended |
Display |
Recommended minimum: 800 X 480 for location, 1280X1024 for studio |
Processor |
Recommended minimum 1 GHz P4 for location, 2GHz P4 for studio |
Memory |
Recommended minimum: 1 Gigabytes for location, 2 Gigabytes for studio |
Disk Drive |
8 Gigabyte unused |
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