Classic SLR Series :
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The Canon EOS-1n RS is a real-time AF single-lens reflex camera equipped with a high-speed motor drive which delivers a blistering film advance rate of 10 frames per second (fps). However, the EOS-1n RS was based on the EOS-1N body chassis to reconstruct and features eight modifications which make it different from the standard version of an EOS-1N.
Major External differences are: the appearance is basically same as EOS-1n attached with Power Booster Drive PDB-E1, excluding the four changes; the "RS" name plate provides the easiest mean of visual verification.
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Other information on -
1. Installation of a fixed, hard-coated pellicle mirror 2. Permanent installation of the power drive booster E1 (not removable). 3. Increased continuous exposure speed. 4. Addition of the RS release mode. 5. Incorporation of a double-shading shutter mechanism. (other info) 6. Custom function 7. Electronic manual focusing under RS and continuous exposure mode. 8. Non-interchangeable focusing screen
1. Installation of a fixed, hard-coated pellicle mirror:-
In other words, virtuall ALL previous Canon EOS SLR camera models are designed such that electronic manual focusing is impossible during exposure. However, since the EOS-1n RS lets the photographer view the subject at all times - even during continuous exposure - manual follow-focusing of moving subjects is made possible through a special function that allows the user to carry out electronic manual focusing during exposure. This function is available in RS mode only, and only when there are two or more bars displayed by the battery check indicator. If the battery voltage falls to the point where only one bar is displayed in the LCD panel (when the camera switches to auto speed reduction L mode, and the film transport mode indicator blinks in the display), this operation will not be executed smoothly or even not possible.
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a) No momentarily disappearance of the viewfinder image. Employment of the hard-coated new pericle mirror, the viewfinder image remains in view at all times which means focusing, composition of the picture and photographic effect at the very instant of exposure can be viewed in real-time, which includes flash. For some of you who never experiences this, when you set the camera for multiple flash photography, you can actually see the effect of the flash burst onto the subject. This constant viewing benefit also extends to while making continuous exposures, object tracking performance in the predictive Al servo AF mode; moving object predictive control can actually be viewed in real-time.
b) RT release available. Optimum release timing during slow synchro second-curtain sync flash photography can be easily determined. The resultant picture state under combined use of the 540EZ and multi-flash set ups can be observed in real-time. For multiple exposures operation or in the case of long time exposure (Bulb), the RT facilitates determination of the picture composition during multiple exposures. Lastly, even aperture operation can be viewed in real time. i.e. * In P or TV AE modes, actual AEB (Automatic Exposure Bracketing) operation can be viewed; * In real-time release mode, since the aperture operation starts immediately after AF focusing is completed at ON position, the ending instant of the AF focusing process can be easily determined.
c) No vibration from shock causes by mirror up & down movement The fixed mirror principle has brought another big advantage in substituting the mirror lock-up mechanism if one always uses that to minimize any potential movement causes by mirror bounce at the use of slow shutter speed settings. Since the handshaking state when the shutter is released can be viewed in real-time, the shake is fed back to the photographer to encourage increased effort in stabilizing the camera. This is especially effective when shooting with telephoto lenses. With the RT, when you sense or visually confirm camera shake is observed, immediate re-exposing compensates the shake, without need for waiting to see the printed results.
Another significant benefit brought with the fixed mirror is, since the mirror mechanism is fixed, the camera is free from mirror movement shock; as the mirror mechanism does not move, camera operation noise is reduced; further, as the limitation for entire pre-&-on exposure process doesn't factor in with the up/down reflex mirror sequence, extremely fast rapid sequence shooting exceeds the best performing rate with the standard Canon EOS-1N with PDB-E1 combination by 166% ! This has made the Canon EOS-1n RS the regular production SLR camera that has the fastest film advance bursting rate on the market and it offers true autofocusing.
2. Permanent installation of the power drive booster E1 (non removable). Due to the EOS-1n RS main objective is to entirely serving professional needs, Canon engineers thought the combination of the PBD-E1 should be made as an integrated unit. Internally, a) Use of the M2 motor for independent movement of the sub-mirror , this resulted with an overall quieter operation. b) Efficient use of the gear ratio margin brought about by fixing the power conditions "high" ---> 1.7-times increase of the continuous exposure speed and 15% reduction of rewinding time.
3. Increased continuous exposure speed High-speed continuous shooting at a rate of up to approx. 10 fps at (RS mode - "CH") when shooting at AF and AE locked and the aperture fixed. Since electronic manual focusing during exposure and during continuous shooting as well as constant manual focus compensation during shooting is also possible.
4. Addition of the RS release mode. Release time lag: 6ms a) Mode setting can be made using the main switch (L-A-RS). b) The operation and specifications correspond to those of the earlier Pellicle Mirror powered Canon EOS RT camera.
5. Incorporation of a double-shading shutter mechanism. Shading performance is improved for use with the pericle mirror. Modification of the EOS-1N shutter mechanism. (Shutter performance corresponds to that of EOS-1N.)
6. Custom function CF-12 (Selects of mirror-up function on EOS-1N) ---->>> Turns in-focus beep on or off when focusing under AF mode. The change is necessary as the fixed mirror mirror mechanism eliminates the need for Mirror-Lock up.
7. Electronic manual focusing under RS and continuous exposure mode. Always available, even during exposure. (not available with EOS-1N and EOS-1); Manual mechanical focusing operations are also workable at all time.
8. Non-interchangeable focusing screen Must be carried out at Canon service centers or authorized network technicians.
NOTE: -The shutter unit's dual-layer light blocking lever is driven directly from the front plate side by the M2 motor also reads the 2-3 motors systems (in the case of EOS-1n RS, it is only three motor systems as PDB-E1 in an integrated unit.
It was interesting that during the mid 94 prior to the launch of the EOS-1N, a good friend of mine from Japan told me the then proposed EOS-1N RS will provide a maximum continuous shooting burst speed of 9.0 fps, where continuous exposure speed was slower, the eventual product stated a different figure (withheld info) which I calculated is actually being boosted to increase from 50% to 1.7 X, amazing , considering the duration where I thought there were working day and night to get this speed boost works for the official launch later. Another technical hicks was the manual focusing when used under RS mode, which was not fully worked across the entire line of lenses and that was fixed as well in enabling MF under RS mode to be always enabled.
A Quick Comparison between Canon EOS-1N RS and Canon EOS-1N with Power Booster Drive E-1
Type Booster removal fixed type, not removable Interchangeable (removable for other combinations) Shutter Double shading focal plane shutter Single shading focal plane shutter Release modes a) standard release mode same with EOS-1N; RS mode: release time lag 6 ms refer to specification of EOS-1N autofocus AF modes RS: AI servo AF mode is NOT available - infocus indications LED only; Beeper function via CF-no. 12 LEDs with electronic beep (cancelable without CF activation) working range (AF) EV -1~18 EV 0~18 Viewfinder Main Mirror Type NC N Pellicle Mirror Half Glass Mirror Movement Fixed Quick Returned Type Reflection Ratio 35% 63% Transmission Ratio 65% 37% Mirror Blockage None. Note: with Canon EF 50mm f/1.0L USM* Not occurring with any EF lenses up to 1200mm focal length Sub Mirror: motor driven, low noise, low shock type; RS Mode: - always retracted Spring Driven type Standard Focusing Screen supplied New Canon Laser-Matte (Ec-R) New Canon Laser-Matte (Ec-CII) User interchangeability on F. Screens No ** Possible RS Mode Shutter Release Time lag 6 ms AI Servo AF No *1 Not available AEB No *2 *1 Autofocus: In RS mode, the AF mode is automatically set to One-shot AF. In RS mode, since the aperture is closed down to the ready state at light press of shutter rlease button to activate the AF/Metering and pictures are taken continuously with the aperture closed down to the operating position, it is physically impossible for the camera to perform the rangefinding signal detection necessary for Al Servo AF operation. Accordingly, when RS mode is selected, the camera automatically sets the AF mode to One-shot AF.
*2 Exposure compensation is possible only while the metering timer is operating. Auto exposure bracketing (AEB) operation is not possible in RS mode. When the camera is set to RS mode, AEB operation is temperily suspended, setting is impossible, and the AEB indications are not displayed. If AEB is set in A mode and then the main switch is switched from A to RS mode, AEB is automatically canceled.. EB remains canceled even when the main swit6 is returned back to A mode.
Others: In RS mode, electronic dial input is impossible while the shutter button is pressed halfway (SW-1 ON) and the aperture is closed down in the shooting-ready state. In this ready state, the camera will not accept main dial input such as changes to setting values (shutter speed, aperture value) or program shifts, nor will it accept quick control dial input such as exposure compensation. Also, AF activation with the AE lock button (CF-No.4-1) is not possible in this state.
Exposure Control AE Lock RS mode: main metering on starts metering and automatically locks AE in all modes - Metering Range Evaluative metering from EV1-20; fine spot metering:- EV2-20 Evaluative metering from EV0-20; fine spot metering:- EV3-20 DEP mode Not possible *3 Provided *3 Due to the priority placed on the camera's high-speed continuous shooting control function, DEP mode was removed to provide the necessary ROM capacity. Film Transport Maximum Continuous Shooting Speed with AF Locked approx. at 10 fps approx. at 6.0 fps Continuous Shooting Speed with AI Servo AF 5.0 fps approx. at 5.0 fps Film Rewind Speed High Speed mode approx. 7 sec. approx. 8 sec. (36 exp. Film Roll) Silent mode 20 sec. approx. 20 sec. Film Rewind Noise level 50 db 60-70 db with PDB-E1 setup Shutter Shield Type Doubled Shield Design Single Shield Depth of Field AE Mode Not Possible Possible Necessary amount of compensation for manual flash exposure + 2/3 f-stop - Grip Inter changeability No Yes Weight (body only) 1,295 g (45.3 oz) 1310 g (45.9 oz) Dimension Virtually BOTH the same with EOS-1N with PBD-E1 setup; 161mm (W) x 155.9mm (H) x 78mm (D) 6-5/16" (W) x 6-1/8" (H) x 3-1/16" (D) * Upper corner of the captured image may be shaded by the mirror frame. ** Possible to change at any authorized Canon Service Centre. NOTE: EOS system accessory compatibility The dedicated PDB is permanently installed; the PDB-El or type AA BP-EI cannot be installed. Others are the sames as with the EOS-1N with PDB-E1 setup.
Differences of Canon EOS-1n RS as compared to another Canon SLR model with RT technology Canon EOS RT
Canon EOS-1n RS
AF focusing points
2.8 compatibility, cross-type rangefinding
Maximum continuous shooting speed (f/s)
Approx. 10 fps
Approx. 5 fps
Electronic manual focusing during continuous exposures
Shortest release time lag (sec)
Fastest shutter speed (sec)
Maximum flash synchronizing shutter speed (sec)
Built-in eyepiece shutter
LR6 x 8
2CR5 x 1
Body dimensions (W x H x D /mm)
161mm x 155.9mm x 78mm
148mm x 108.3mm x 67.5mm
Body weight (g) Weight (g) without batteries
Body weight with batteries
Note: the HC-N pericle mirror unit is the same as that used in the EOS RT, and has complete compatibility betwen the two.
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Background and Various Issues | The Basic Features & various Setup
Manual & Auto Focusing | Metering Systems | Exposure Control | Viewfinder Optical
System Flash Photography (with Speedlite 540EZ extension & Selective info on Canon TTL Flash Models:-160E | 200E | 300EZ | 300TL | 420EZ | 430 EZ | 480EG | MacroLites | Other non-TTL Canon flash model
Reliability Issues:- Body Chassis | Shutter Unit | Electronic Circuitry | Film Transport & film handling Secondary Functions:- Custom Function Part One | Part Two | System Accessories:- Film Back Options - instruction for Command Back E1 | Macro/Close Up Part one | Part two and Part III Flash for Macro-Photography | Power Sources -BP-E1 | PDB-E1 | Focusing Screens | Remote Control with Wireless Remote Set LC-3 | System compatibility
Variants of Canon EOS-1N:- Canon EOS-1N RS | Canon/Kodak Digital DCS-1, 3 -5 & 520/560 Series | Full Technical Specification | Main Reference Map / Nomenclature | Resource Centre:- Comparative Charts between EOS-1 & EOS-1N / or with its active Competition(s) (Nikon); Quick Operational Reference Card (278k Gif File); Listings of 7-segment digital numbers/letters appeared on LCD display panel/viewfinders (HTML page); External Link:-Instruction Manual (3.3MB PDF file applicable for both Canon EOS-1N (RS). | Using EOS system for your photography | Bots & Nuts of EOS System - by Philip Chong |
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