Additional information relates
to the H-CN ("Hard-Coated New") Pericle Mirror and Viewfinder are as followed:-
(1) Hard-Coated New (HC-N) Pericle Mirror. Actually, all basic specifications
and characteristics of this mirror are exactly the same as the pellicle mirror used
in-the EOS RT.
Canon H-CN Pellicle Mirror Basic Specifications:-
| Item | Description | |
| Base | Material | Ultra-thin-film polyester sheet |
| Thickness | Thickness 23 (0.023 mm) |
|
| Vapor-deposition film | Material | Titanium oxide, Silicon oxide |
| Thickness | approx. 0.5 (0.0005 mm) |
|
| Transmission : Reflection ratio | 65:35 (%) | |
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Backyard at Inono by Jeremy Novak Credit: Image courtesy of Mr. Jeremy Novak ® . I found this image from his Portfolio at Pbase. Image copyright © 2006. All rights reserved. Please respect the visual property of the contributing photographer.
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Sequential action of the double-shield Shutter Curtain and sub mirror movement before and during exposure. |
The shutter unit's dual-layer light blocking lever is driven directly from the front plate side by the M2 motor. Since a spring constantly applies light block-release force to the dual-layer light blocking lever, the shutter unit itself is designed as a dual-layer fight-blocking release-hold type unit.
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Actually, development of Pellicle Mirror technologies have never been stopped, and many common issues have been well addressed to improve its all-round practical usage. For an example, regardless of the super-thinness of the HC-N pellicle mirror, the fact that it is always present in the optical path is sure to raise questions about the effect of the mirror on optical performance. Canon used to explain the effect on optical performance on the use of Pellicle Mirror onto SLRs as follows: |
Due to various
interpretations, some market users (esp. from rivaling labels) have raised concern
over the Autofocus Canon EOS RT Pellicle Mirror's quality, strength and durability.
But it has proven over the years that the mirror was sufficiently reliable, if not
durable to meet demanding usage of the camera. Canon even put up their statistics
relating to reliability figures to assure users of their concern; remember the Canon's
original pericle mirror-equipped camera, the Canon Pellix QL? It had a relatively
high pellicle mirror-related repair rate of 19%, where the EOS RT's Pellicle mirror-related
repair rate was averaged out at slightly only less than 2%.
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" ... from an optic theory point of view, it is possible for such a film to affect image formation performance in terms of axial chromatic aberration, transverse chromatic aberration, astigmatism, and ghosting caused by reflections from the thin-film surface. In actuality, however, all of these aberrations are within 0.2-0.6 |
Credit: Image(s) courtesy of '"eBay Member: bnw2003" (e-mail)who specialises trading of new, used collectable cameras. The Company also operates a popular Ebay Store. All image(s) appeared herein are Copyright © 2005. All rights reserved. Please respect the visual property of the contributing photographer.
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An explosive view is required to outline the various structural Components which make up the Canon EOS-1N RS. Image was scanned from a Canon literature. The Blue line: optical path; Yellow: Location of the Fixed Pellicle Mirror; Purple: diverted light to SI screen (AF Points); Green for Spot as well as autofocus detection by the BASIS AF module; the light blue: for measurement of light reflected from the shutter curtain during flash exposure. Note: the sub-mirror is the active component that works freely in all these pre-meter and exposure processes (refer to the various movements at the top of this page in how and when it retracted and reverted back to normal positions. |
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Viewfinder Brightness and EOS-1N RS Standard Focusing Screen
Simply comparing
the reflection ratios of the main mirrors shown in the earlier page, the amount of light
reaching the eye of a photographer using the EOS-1n RS is approximately half (actually
-0.85 stop) less than when using the EOS-1N. The matte surface of the EOS-1N's standard
focusing screen is the EOS standard New Laser matte surface. If this same screen
were used in the EOS-1n RS, however, the viewfinder would be darker than the New
Laser matte screen equipped EOS RT. To minimize the reduction in brightness due to
the low reflection ratio, the standard focusing screen of the EOS-1n RS is a Canon
re-developed New Laser matte-type screen (Ec-R), which provides better viewfinder
brightness. This
Ec-R screen can also be used in the EOS-1N.
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Exchanging the Focusing Screen The internal construction of the focusing screen's mount section is the same as the EOS-1N, but if the unit were designed to allow user replacement of the focusing screen, some of the fight passing through the shooting optical system would enter the viewfinder through the cutout designed for the screen exchange tool, causing viewfinder ghosting as well as ghosting in the actual image (since some of the light reflected from the bottom of the screen would reach the film). To prevent this, Canon had to remove the cutout section. As a result, focusing screen replacement must be carried out at authorized Canon service centers. |
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Focusing Screen Type Ec-R (EOS-1N RS specific) New Laser-matte Provided standard with the EOS-1N RS body, compensates for the decreased viewfinder brightness due to the low reflection factor of the pellicle mirror. When used with the EOS-1 N, viewfinder image is approx. one f/stop brighter compared to that when using the standard Ec-Cll. ( Full Sreen Availability | |
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Note:- The RT's focusing screen section was designed with a tool cutout for screen change by user. This is possible in the EOS RT because the focusing screen is positioned deeper in the mount than in the EOS-1n RS, so the above ghosting problems do not occur. |
Some information
on the Shutter Unit of EOS-1n RS with Dual-Layer Light Blocking Mechanism
The vertical travel, fully electronically-controlled shutter unit is essentially
similar to the EOS-1N, except it uses a Canon-developed dual-layer light blocking
design - when the camera is in standby mode. The durability and construction are
the same. As light is constantly projects onto the shutter via the half -mirror on
any SLRs, the light blocking capability requires a shield in front of the curtain
during viewing/autofocusing, but in the case of the full transmission of lights through
the lens which will project directly to the curtain,EOS-1n RS, therefore, has a double
layers shield where the rear shutter blades are partially driven to provide two light-blocking
layers in the top half of the body aperture. The EOS RT principle is equipped with
a full-aperture dual-layer light blocking mechanism, differential structural restrictions
in the EOS-1n RS limit the dual-layer light-blocking capability to the top half the
aperture. In this area, Canon claimed, in tests, this design on the EOS-1n RS has
no problems even when exposed to light 4 X (four times) as strong as the internal
specifications for a normal camera. Further, even though the RS's light blocking
mechanism adds an extra step to the shutter drive sequence compared to the EOS-1N,
the shutter unit's overall operation durability is the same between the EOS-1N and
RS model. A point of difference is, the shutter unit's dual-layer light blocking
lever is now driven directly from the front plate side by the M2 motor and Canon
also explains since a spring constantly applies light block-release force to the
dual-layer light blocking lever, the shutter unit itself is designed as a dual-layer
fight-blocking release-hold type unit.
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| NEXT | Other Informations + some extracts from the EOS-1N RS instruction manual |
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 |
The Eyes of EOS -
EF Lenses
A little OFF-TOPIC SOME Personal
Thought
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HOME - Photography in Malaysia |
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Volunteered Maintainer(s) for the Canon EOS-1N Series Message Board: Philip Chong, Editor, Digital Camera Magazine; Vincent Thian, Photo Editor, Malaysian Bureau, Associated Press "AP", CYleow, Ex-photo Editor of local daily, The Star; Gary Rowan Higgins, Australia and other nice folks on the web.
Special Credit:- :Mr. Richard Yeow & Mr. Simon Wong from camera division of 
Marketing Malaysia, for
their continual effort in supporting development of this EOS/EF website.
Others: All
the nice people on earth who have contributed their photos and pictures of personal
works or product shots for the creation of this site. Certain content and
images appeared in this site were either scanned from official marketing leaflets,
brochures published by Nikon and/or contribution from surfers who claimed originality
of their own work for public publishing in this website, where majority of the extracted
information are used basing on educational merits. The creator of this site will
not be responsible for any discrepancies that may arise from any possible dispute
except rectifying them after verification from respective source. Neither Nikon or
its associates has granted any permission(s) in using their public information nor
has any interest in the creation of this site. "Canon", "EOS", "EF"
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