Canon EOS 1n-RS (Photon magazine, February 1996)

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BACK in 1996, David Kilpatrick and Andy Aitken reviewed the latest Canon for David’s Photon magazine. It has something which the Canon EOS 1D MkIII of 2007 also features – 10 frames a second. But to achieve this it had to sacrifice focus tracking and use a pellicle mirror, with the lens permanently stopped down during fast sequences. This article makes interesting reading in the light of developments since in the digital domain.

Canon’s latest EOS 1n range now consists of no less than four variants (the magazine report read in 1996). The basic EOS 1n has improved focusing abilities, custom functions, multi zone TTL metering and improved noise reduction over the original EOS 1. The EOS 1n DP includes a AA battery pack allowing switching between AAs and the standard lithium cell. The 1n HS provides six frames per second – with the detachable E1 booster – together with as much noise reduction as possible in an SLR with an instant-return mirror. Which brings us to the almost unique EOS 1n RS.



Prior to the RS, the EOS RT (a variant of the 650) offered a pellicle mirror, semi-silvered so that it could remain fixed and provide a viewing image while allowing most the light to reach the film.

As Canon found with their original 1965 Pellix, developed from the Canonflex RM2000 at the same time as the FT, the silence of the pellicle mirror SLR does not appear to outweigh the largely imaginary loss of image quality which the average buyer thinks such an obstruction must cause. The EOS RT was another dead-end development even though bodies are now much in demand, as often happens with a discontinued model offering a unique feature.

There remains a need at the very top end of press, sports, military, surveillance and scientific photography for shooting speeds with approach movie rates, combined with the size and convenience of a 35mm SLR. The critical frames per second zone is around 10fps, twice the speed of motordrives built in to cameras like the Minolta 9xi (still the fastest integral drive in a standard body – 1996) and three times the speed which qualifies for description as ‘motor-drive’ rather than ‘auto winder’.

The Nikon Titan HS ran as fast as 14fps, but in practice it’s not necessary to go to this extreme; when this kind of rate is demanded, 35mm movie cameras do a far better job, shooting at settings from 16 to 32fps and using a rotating prism to maintain TTL viewing. Specialist high-speed cameras, based on motion picture technology, can achieve rates many times faster than this.


Canon’s latest solution combines the noise reduction of the EOS 1n HS with a better pellicle mirror than the RT, and adds a 10fps maximum speed. This has demanded a new shutter mechanism, new motor, a different focusing screen, and some specific changes in functions like stop-down preview and AE Lock (not available in RS mode).

The motor also provides 15% faster film rewind times, and the absence of the moving mirror reduces the delay between pressing the shutter and getting a shot from 55 milliseconds to only 6ms. This comparison is quoted rather differently by Canon – they refer to the 6ms time, and separately to a 49ms reduction in shutter firing delay.

Perhaps this is because the idea that the existing HS model has a 55ms delay between triggering and actual exposure – a full 1/20th of a second – will come as a surprise to those who do not know just how very slow almost all AF SLRs are in this department.

Whatever the case, 6ms is as good as no time-lag whatsoever, and is not significant when compared to the eye-brain-finger delay involved in single shot work. At 10fps, or even the 6fps ‘A’ mode also offered by the EOS 1n RS, a 6ms delay at the start of a sequence is infinitely less significant than the 100ms gap between frames.

The pellicle mirror does mean a 2/3rds of a stop light loss at the film plane, but an improved non-user-changeable focusing screen, designed to prevent ‘fogging’ via the eyepiece lightpath as well, ensures that no perceptible finder brightness is lost.

This light loss might normally have a number of disadvantages such as inaccuracies when using a hand meter or non-TTL flash as the prism ‘steals’ 35% of the light every time. In practice it is hard to imagine the type of photographer who would require the RS using non-dedicated flash, especially when the metering and flash systems are so advanced.

The metering system is highly sophisticated – arguably overly so. Firstly there is a 16 segment evaluative pattern which also considers information from the five point autofocus system. Partial Metering (there is no centre weighted option as it has been rendered obsolete by the evaluative option) uses information from the central 9% of the image area. Fine Spot Metering uses a tight 2.3% circle marked in the viewfinder but it doesn’t even end there. A custom function allows spot metering over a larger 3.5% area to be moved round the screen to any of the five user selectable focus points.

However it is reasonable to suggest that it would be as simple to use the central option, lock and recompose. But at least all the options are there.


In use, the EOS 1n RS is perhaps the quietest AF SLR made (Editor’s note – it probably still qualifies). The fixed motordrive gives it a very solid and comfortable feel, and the motor action is Rolls-Royce in quality. With the 85mm Ä1.4 lens fitted, focusing was not only lightning-fast, but almost silent.

The contrast between this and a camera like the Minolta 9xi can not be over-emphasized; on paper, the 9xi still outperforms the EOS when tracking moving subjects on AF, but does so in a way which seems noisy, jerky and disruptive compared to the whisper-quiet ultrasonic focus adjustment of the Canon.

Combine this AF action which no subject would normally hear, the very quiet motor-wind, and a shutter action no louder than a Leica M, and you have a camera which could be used at critical moments during public ceremonies or performances.

You might even avoid the abuse reserved for photographers from TV crews and still get to shoot action sequences. There are many situations where the sale of broadcast rights to TV stations gives them the ability to ban flashguns outright and have any noisy still photographers ejected. The EOS 1n RS could be a worthwhile extra £1,000 spent over the standard EOS 1n if you encounter this situation when working.

There are limitations to the RS model. For a start, we asked the owner of the rare RS which we had a look at, sports photographer Geoff Evans, to let us have a sequence to demonstrate it at 10fps. A month later, the winter weather in SCotland still hadn’t produced a bright enough day for the RS mode to be used as the 10 fps rate needs a minimum shutter speed of 1/1,000th.

Geoff’s previous camera choice was a Nikon F4 and he was initially concerned at how well he would adapt to the handling of the Canon with its different weight distribution and thumbwheel controls. He needn’t have worried as the camera turns out to be a delight to handle. When shooting in horizontally it fits the hand perfectly. Held vertically, Geoff found it more comfortable than we did, but then everyone’s hands are different.

The built-in booster makes it quite bottom heavy but this seems to help control stability and balance, especially when panning.

The big control wheel on the camera back may look like a silly idea but it works better than you could ever imagine – in any case it can be switched off and on as required. The front control wheel would be more comfortable if slightly angled but works well enough. Functions are all easily activated with a bare minimum of buttons.

Although weighing in at a hefty 1.3 Kg – without batteries or lens – it seems to almost float in the hands, even if it might feel more like a brick in ’round the neck’ mode. This makes it just a touch heavier than its nearest rival the Nikon F4s (5.7 fps) and exactly twice the weight of the Pentax Z1-p (4 fps).

The drive booster is part of the camera unlike the rest of the EOS 1n range where it can be detached to save space or weight. Any of the other 1n models can interchange battery packs and boosters but the RS is stuck with its lot.

A disadvantage in the high speed RS mode is that the lens stops down to working aperture – dimming the viewfinder image as if back to stop down metering days. Also, the predictive AI autofocus tracking doesn’t work at speeds faster than 5fps. 10 fps has its cost both financially and in restricted features, but then you don’t get anything for nothing.

Normally, the photographer will use the RS much like an EOS RT, but with EOS 1n drive speeds. In one-shot AF mode, you can fire 3 or 6 frames a second; in AI Servo mode, tracking the subject by updating the AF setting between frames, 2.5 or 5fps. To get the benefit of the silent rewind mode you must put up with 20 seconds to roll back a 36 exposure film, compared to only 7 seconds in velvet-burning mode. Having said that, orchestral performances and chess tournaments don’t often call for lightning rewinds.


The EOS 1n RS is probably not the most expensive 35mm SLR body made at around £2,500 (1996) because someone will always point to a hand-built one-off design. It is probably the most expensive regular production system SLR, as well as currently the fastest production motordrive model.

It may not have the other attributes we have associated with this kind of firing speed in the past, like a titanium body and a battery pack you wear in your underpants in cold weather, but it benefits from being a variant of a top-selling SLR for professional action sports and press work.

If you baulk at the price of the RS or are happy with 6 fps and a normal instant return mirror then the EOS 1n HS is more likely to be the model for you. Thanks to Geoff for bringing the EOS 1n RS into the office for a look over and a chat about its qualities as this is not a camera we expect to see in every dealer or be available for a routine test. No special prize to the first reader to spot one in use, either, but watch the sidelines of TV sports programmes and news events for glimpses of lenshounds desperately trying to load a fresh roll of film every 15 seconds!



  • Well I certainly don’t need another camera, that’s for certain. However, I have a penchant for acquiring out of the ordinary models. IMHO the Canon 1N RS is the epitome of this description. I’ve been reading about and consequently lusting over them for many moons. Low and behold, what did I stumble upon today? A virtually untouched RS along with a new Crumpler Disgrace red Canon CPS issued strap, all for the tidy sum of $150.00 including delivery! I honestly don’t believe it’s ever met a roll of film. I can hardly wait until it arrives, perhaps it’s just a dream. ;^ )
    Now starts the search for the perfect lenses to capitalize on it’s abilities. While I have an abundance of Nikon, Olympus OM, Pentax K, Pentax M42, Minolta AF and Canon FD lenses, I only have two for my only EF camera, an EOS 3. This is most assuredly an addiction. Thanks to all for helping fuel my craving with your excellent analyses on the RS. Anybody have a number for a good divorce lawyer?

  • I have a shamefully underused 1n RS and this article has inspired me to dig it out. Imagine my shame when I realised that I’d left the batteries in long enough for them to corrode into the battery holder! Where/how do I get hold of the appropriate 6-battery holder?

  • Loved this article and write up… on aswell, I should know as I have just acquired a CANON EOS-1N RS and I love it, I havent got to know it fully yet as we are still in the first throws of passion as yet.

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