Canon EOS Resources Additional information relating to- Canon EOS-650

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PRECISELY MATCHED LENS INFORMATION

During the early part of '80, many camera manufacturers have introduced their respective innovation in areas such as semi-automatic data bridging between camera and lenses. These were required as sophistication is program exposure control would require information of lenses to be remitted to the camera for more accurate metering calculation. Some manufacturers installed intelligent program exposure where focal length was calculated to provide higher shutter speed in case lenses are beyond 135mm. The communication method were confined to mechanical means such as using notch, pins and ridges. However, some may require exposure control be altered if lens with varying focal length was changed.

With Canon EOS system, there's no need to worry about changing exposure programs even when you change lenses as the communication data exchange is entirely electronic and each Canon EF lens incorporates a four-bit microprocessor that stores data reflecting the special characteristics of the lens. When the lens is changed (or when an EOS zoom lens' focal length is increased or decreased), the EOS 650's intelligent program AE automatically shifts the exposure program in accordance with lens information to ensure correct exposure.

In addition, the EOS 650 sounds a long electronic beeper tone to warn of camera-shake when the automatically set shutter speed becomes too slow for handheld photography; that is, 0 to 0.5 steps below 1/lens focal length, generally said to be the limit for handheld shooting.

THE EF LENS MOUNT - Getting outstanding response, accuracy and reliability, plus unlimited potential for the future

Everyone knows that a chain is only as strong as its weakest link. With body autofocus systems, the weakest link is the conventional mechanical coupling between the camera body and the lens. Canon's EOS autofocus system, on the other hand, utilizes a fully electronic mount-there are no mechanical connections whatsoever between the camera body and the lens. The new precision machined EF (Electro-Focus) lens mount features gold-plated electronic contacts that transmit data between the central computer in the camera and the onboard computer (which controls autofocus and aperture control functions) in the lens. Since there are no mechanical connections, response, accuracy and reliability are all improved in comparison with conventional systems. In addition, the autofocus drive system can still be used when an extender or extension tube (anticipated Canon releases in the future) are mounted.

Canon developed BASIS Sensor

Early EOS system employed with an innovative sensing device - the Canon BASIS (Base-Stored Imaging Sensor) which has a high level of sensitivity, resultant in enabling the EOS 650 delivers a high performance in low light conditions rated as low as EV1 (Bright Are Luminance) condition sometimes even manual focusing find it impossible.

The BASIS sensor increases autofocus sensitivity in two ways: by enabling the use of very low value incidence light signals and by amplifying these signals before processing them. As a result, the photographer may even work and focus accurately in condition as dim as a single candle light source.

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Technical Specifications - EOS 650
| Instruction Manual for EOS620/650 - External Link

Canon Autofocus EF Lens Resources

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Additional information on other EOS AF-SLR Models:
EOS-650 (1987.2) | EOS-620 (1987.5) | EOS-750QD (1988.10) | EOS-850QD (1988.10) | EOS-630QD (1989.4) | EOS-1 (1989.9) | EOS-RT (1989.10) | EOS-700QD (1990.3) | EOS-10S QD (1990.3) | Canon T-60 | EOS-1000F /RebelS QD (1990.9) | EOS-100 / Elan QD (1991.9) | Canon EF-M (1991.9) | EOS-5/A2E QD (1992.10) | EOS-1000FN /Rebel S II QD (1992.4) | EOS-500 / Rebel XS / KISS (1993.10) | EOS-1n (1994.9) | EOS-888/5000QD (1995.1) | EOS-1n RS (1995.3) | EOS-50/50E / Elan II(E) /EOS 55 (1995.9) | EOS -500N / Rebel G / KISS II (1996.9) | EOS-IX (1996.10) / EOS-IX Lite /IX-7 (1996.3) | EOS-3 (1998.11) | EOS-88/3000 (1999.3) | EOS-300 / Rebel 2000 QD / KISS III (1999.4) | EOS-1v (2000.3) | EOS-30 / EOS-7 / EOS Elan 7E (2000.10) | EOS-3000N /EOS-66 / Rebel XS-N (2002.2) | EOS-300V / Rebel Ti / KISS V (2002.9) | EOS 3000V / Rebel K2 / KISS Lite (2003.9)

Flash Photography:- Part 1 | 2 | 3 | 4 - Canon 540EZ site
Selective Canon TTL Flash Models:- 160E | 200E | 300EZ | 300TL | 420EZ | 430 EZ | 480EG | 540EZ | Macrolites | Other non-TTL Canon flash models
Others: | Canon RS-60E3 Remote Switch | Canon RC-1 Remote Control | Canon RC-2 Remote Controller | Canon TC-80N3 Timer Remote Controller |

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Credit: To all the good people who has contributed their own experience, resources or those who are kind enough granting us permission to use their images appeared in this site. Site concept & design: leofoo® MIR Web Development Team. Copyright 2002. Members of the EOS Site Maintenance Team : Philip Chong, CYLeow, Vincent Thian. images handling on EOS models: EeWyn; Setup, coordination by: Wati. Mirza. *Credit: Mr. Richard Yeow & Mr. Simon Wong from camera division of Canon Marketing, for their continual effort in supporting development of this EOS/EF website. Note:certain content and images appeared in this site were either scanned from official marketing leaflets, brochures, sales manuals or publications published by Canon Inc. over the years and/or contribution from surfers who claimed originality of their work for educational purposes. The creator of the site will not be responsible for may discrepancies arise from such dispute except rectifying them after verification."Canon", "EF lenses" & "EOS" are registered tradenames of Canon Inc., Japan. Site made with an Apple IMac.