Canon 10 x 30 IS Manual Download Page 9 | Manualshive

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background image

Wide field of view

Narrow field of view

Image circle

Film format

(Fig. 6)

Lens

?

Field of view and image circle

Film for 35-mm cameras has a set standard format
(24 x 36 mm), and if the focal distance is the same, generally
the angle of the lens will not change. However, the field of view
is larger than the film, and the part of the view which is larger
than the film is called the image circle (Fig. 6). The field of
view for binoculars is usually everything inside the perimeter
of the image circle.

Field of View/Real Field of View/Apparent
Field of View/Field of View at 1.000 meters

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Summary of Contents for 10 x 30 IS

Page 1: ...10X30 IS 15X50 IS ALL WEATHER 18X50 IS ALL WEATHER BINOCULARS TECHNOLOGY GUIDE 12X36 IS ...

Page 2: ... rings To adjust the diopters to your own eyesight Focusing ring To adjust the focus Eyepiece lens Enlarges the object refracted from the objective lens It consists of three groups of 5 lenses Eye cups Protect the eyes from shock and harmful rays Doublet field flattener Makes the images sharp throughout the field of view This consists of two lenses Erecting prisms Corrects the inverted image Vari ...

Page 3: ...ht 2 With your right eye closed look through the left eyepiece with your left eye Using the focusing ring adjust the focus on an object 3 Now close your left eye and look through the right eyepiece If the object is in focus the diopter was adjusted correctly Otherwise use the right diopter adjustment ring to readjust the focusing 4 By adjusting the focusing ring each time you look at an object the...

Page 4: ...x lenses for both the objective lens and eyepiece lens They are called prism binoculars because prisms are used to correct the inverted image 1 Porro Prisms Fig 1 Because of the porro prisms the light passing through forms a Z shape before reaching the eye 2 Roof Prisms Fig 2 When using roof shaped prisms called Roof or Dach meaning roof in German prisms the light passes through in a straight line...

Page 5: ...es Attach a wide angle lens to a telephoto lens Without shifting the optical axis look through from the back of the lens and adjust the distance between the two lenses You will eventually see a sharp inverted image This is the basic structure of a telescope Put two of these side by side and you have a pair of binoculars In addition the longer the focal point of the telephoto lens and the shorter t...

Page 6: ... only difference is that while a telephoto lens must be wide enough to magnify the image for the fairly wide aperture of the camera binoculars need only magnify the image for the relatively smaller iris of the human eye Say for example you have 12x magnification binoculars To get the same enlarged image using a 35 mm Single lens reflex camera you would need to use a 700 800 mm telephoto lens Magni...

Page 7: ...ition to using the doublet field flattener UD lens and aspherical lenses to achieve ideal resolving power Canon has used its own original image stabilization technology in the IS series which greatly controls hand shake It is because of these technologies that with Canon s binoculars each feather on a bird s wing comes in crisp and clear How clearly the binoculars let you distinguish details is ca...

Page 8: ...rent field of view This is the value of the real field of view multiplied by the magnification Fig 5 b For example if 10x magnification binoculars have a 5x real field of view the apparent field of view will be 50 This value represents the field of view which you will see looking through the binoculars It is comparable even among binoculars of different magnification In general if the apparent fie...

Page 9: ...stance is the same generally the angle of the lens will not change However the field of view is larger than the film and the part of the view which is larger than the film is called the image circle Fig 6 The field of view for binoculars is usually everything inside the perimeter of the image circle Field of View Real Field of View Apparent Field of View Field of View at 1 000 meters 9 ...

Page 10: ... aperture of the exit pupil Human pupils are about 2 3 mm at most Fig 7 a when bright and the binoculars exit pupils should be about 3 mm At night our pupils dilate to about 7 mm Fig 7 b so it is desirable to have binoculars with large exit pupils if they will be used at night However the disadvantage is that such binoculars tend to be big and heavy 2 Available Aperture of the Objective Lens The d...

Page 11: ...th the twilight coefficient As a result using 12x36 binoculars at night will provide more detail Brightness and Lens Reflection Even with binoculars with the same exit pupil the brightness may not always be the same This is due to the amount of light reflected by the lens With uncoated lenses about 8 of incident light is reflected The more light is reflected the lower the brightness of the images ...

Page 12: ...ality with just a spec sheet The easiest and surest way is to actually look through the binoculars Please keep the following points in mind when purchasing binoculars 1 Do you see only one image or two Binoculars use two lenses parallel to each other However if alignment during manufacture is not perfect or owing to shock during transport the lenses may become just a bit off If that happens you wi...

Page 13: ...a Comatic aberration The image around the light source is blurred There is a yellow tint on the image The highlight part looks pink b Chromatic aberration c Discoloration 13 ...

Page 14: ... where the binoculars were forced to have a wider field of view which causes the image quality around the edge of the lens to decrease When this happens most of the time it is caused by curvature of the field Point the binoculars at a wall focus on something simple and check if you can see clearly all round photo e If the curvature of the field is large the edges will be blurred It is not recommen...

Page 15: ...eld The colors are not vivid and look dull The building is slanted and has a spool shaped effect f Distortion d Contrast The image around the light source is blurred Chromatic Aberration Curvature of the Field Distortion 15 ...

Page 16: ...owever tripods are bulky and can t be used everywhere Even if you need a pair of binoculars of over 10x magnification for bird watching the most you would want to use since you walk around a lot would be something of 7x or 8x magnification Canon is the world s first maker to use an active optical image stabilizer for IS series Because two Vari Angle Prisms are controlled by a microprocessor hand s...

Page 17: ...With image stabilizer Without image stabilizer With the image stabilizer on you are guaranteed stable images even from a moving vehicle Image Stabilizer Vari Angle Prism 17 ...

Page 18: ... field flattener lens Fig 9 This is Canon s exclusive optical design with two field flattener lenses lenses which are normally reserved for high grade binoculars By using two lenses Canon has achieved a wide field of view of 67 12x36 IS 15x50 IS ALL WEATHER 18x50 IS ALL WEATHER with unrivaled sharpness Fig 6 You can enjoy the power and sharp image Object lens UD lens Eye lens Right side Moves when...

Page 19: ...king around with a pair of binoculars For that reason you would like to carry around something light 10x30 IS despite its image stabilizer and full size weighs only 600 gr Because a tripod would weigh a couple of pounds the burden is cut down considerably The 15x50 IS ALL WEATHER and the 18x50 IS ALL WEATHER are designed with a sealed construction that suits them for outdoor use even in the heavie...

Page 20: ...atter how much the binoculars are shaken the image will remain stable This system is used in Fujinon s Stabiscope S1240 and S1640 Advantage Extremely resistant to heavy shaking or movement Disadvantages One minute delay while the 12 000 rpm motor is starting up Tend to be heavy This system is unable to distinguish between shake and panning therefore image is not stable when panning Requires batter...

Page 21: ...ment 3 Distortion 14 Doublet Field Flattener Lens 18 Exit Pupil 10 Eye Spacing 3 Field Flattener Lens 18 Field of View 8 Field of View at 1 000 meters 8 Galileo Binoculars 4 Image Stabilizer 16 Magnification 6 Porro Prisms 4 Prism Binoculars 4 Resolving Power 7 Roof Prisms 4 Rubber Eyepieces 3 Real Field of View 8 Twilight Coefficient 11 Variable Angle Prism 16 21 ...

Page 22: ...ll feel as if you were in the royal box no matter how large the stadium You can see Pleiades M 45 clearly 15x50 IS All Weather Model name and 12x36 IS 10x30 IS 18x50 IS All Weather 77ºF 25ºC 14ºF 10ºC 77ºF 25ºC 14ºF 10ºC 77ºF 25ºC 14ºF 10ºC Alkaline battery 2 5 hrs 10 min 1 5 hrs 5 min 4 hrs 20 min Lithium battery 8 hrs 1 5 hrs 7 hrs 3 hrs 12 hrs 5 hrs Type of Battery used Temperatur F C The Opera...

Page 23: ...es ds on ER Sports All Canon Binoculars are composed only of environment friendly lead free optical glass This special lens design was engineered as part of the corporation s continued concern towards our environment The WP in the model designation is for Waterproof A indicates the incorporation of an aspherical lens The dimensions apply when the binoculars are in the case Waterproof models are wa...

Page 24: ... 13472751 www seque pt Canon España S A Tel 34 91 538 4500 Fax 34 91 411 4176 www canon es Canon Sveska AB Tel 46 8 744 8500 Fax 46 8 744 6455 www canon se Canon Oy Tel 358 10 54420 Fax 358 10 5444571 www canon fi Canon Norge as Tel 47 22 629200 Fax 47 22 629260 www canon no Intersys SA Tel 30 1 9242710 Fax 30 1 9242714 www audiocam gr Canon North East Oy Tel 7 095 2585600 Fax 7 095 2585601 www ca...

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