Canon EF 25 Manuel d'utilisateur télécharger pdf

Technique Extension tubes

Increasing the distance between the lens and the sensor or film

reduces the focusing distance. That’s how macro lenses do it. But

you can get similar results by fitting an extension tube.

Move closer

46 |47

If you are serious about macro photography,

you probably own a macro lens. They are the

tool of choice for photographers who want to

get close to their subjects, but do not want to

compromise on image quality, ease of use or

performance.

However, the performance of macro lenses

comes at a price – the cost of the lens. But

what if you would like to dabble in macro or

close-up photography without the expense of

buying a macro lens? Is there any way to get

in closer and obtain increased magniﬁcation

with the range of lenses you already own?

Extension tubes could be the solution you

are looking for. The principle is very simple.

When it comes to close-up photography, your

lenses are limited by how close to the subject

they can focus. The closer the focusing

distance, the further the front element needs

to be from the sensor plane. This distance is

called extension – the greater the extension

the closer you can get to the subject.

Extension tubes work by increasing

the lens extension – the physical distance

between the front element of the lens and the

ﬁlm or digital sensor.

An extension tube is simply a light-tight

tube that ﬁts between the camera body and

lens. The extension of the lens is increased,

the minimum focusing distance decreases,

and you can get closer to your subject for

greater magniﬁcation.

Canon makes two extension tubes, the EF

25 II and EF 12 II. They have a length of

25mm and 12mm respectively. The EF 25

II gives more extension, and therefore

greater magniﬁcation, but it is

more expensive. You can also

use the two together for even

more extension. Canon doesn’t

recommend this (it says data

transfer may be affected), but it

worked for us.

The EF 25 II and EF 12 II

extension tubes were introduced

Discontinued extension tubes EF 25 and EF12

Above Canon

extension tube EF 25

II ﬁtted between an

EOS camera and an EF

50mm f1.8 lens.

in September 2004 at the same time as the

EOS 300D camera and EF-S lenses. Prior to

this date, Canon sold the EF 25 and EF 12

extension tubes. They are identical to the

newer versions except in one respect – you

cannot use them with EF-S lenses.

These Mark I versions have long

been discontinued, but you

may be able to ﬁnd them on

the second-hand market. If

you do not use EF-S lenses

they could be an economical

alternative.

Current extension tubes EF 25 II and EF 12 II

Canon extension tubes

Right and opposite

Shooting square to

the subject overcomes

some of the problems

with the limited depth-

of-ﬁeld in close-up

photography. Much of

the dragonﬂy is sharp in

both photographs. They

were taken using the EF

12 and EF 25 extension

tubes mounted

together on an EF 70-

200mm f2.8L IS USM

lens. The main light is

from a Speedlite ﬁred

through a diffuser to

avoid hotspots on the

delicate wings. Slow

shutter speeds pick up

the ambient light.

Right 1/15 second at

f16, ISO 400.

Opposite 1/10 second at

f16, ISO 100.

Both with EOS 5D Mk II.

LEE BEEL

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Résumé du contenu

Page 1 - Move closer

Technique Extension tubesIncreasing the distance between the lens and the sensor or film reduces the focusing distance. That’s how macro lenses do it

Page 2 - Extension tubes in action

Technique Extension tubeswith EF 12 II andEF 25 II tubeswith EF 25 IIextension tubeTube magniﬁcation48 |49Extension tubes in actionExtension tubesLen

Page 3 - Focus stacking

Technique Extension tubes50 |51Focus stackingFocus stacking is a technique which can be used to achieve front-to-back sharpness in close-up images wi

Page 4 - May-lin Joe

Technique Extension tubes52 |53For my water droplet photos I use an EF 100mm Macro lens with an EF 25 II extension tube and manual focus to get the b

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Canon EF 25 Manuel d'utilisateur

Naviguer en ligne ou télécharger Manuel d'utilisateur pour Accessoires pour appareils photo Canon EF 25. Canon extension tubes Manuel d'utilisatio

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