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The features of a digital SLR or digital
single lens reflex camera can be compared with the latest auto focus
single lens reflex film camera of 35mm. Both operate on similar
mechanical principles in terms of optics. The main difference being that
the film is replaced with a CMOS sensor image, which results in the
creation of digital images. This is done with the help of the
accompanying electronics and eliminates the need to develop films
through chemical processes.
Digital camera lenses come in a large variety. There are various words
and terms used for them. For example the focal length of lenses are said
to be equivalent to 35mm. Fixed focal length lenses cannot be changed
like other lenses. The photographer is required to go closer to his
subject if he desires to take a close up. However clicking from
extremely close quarters can cause the features of the picture to get
distorted. These types of lenses are not changeable.
Digital cameras have typical zoom lenses. To be more precise, a digital
zoom cannot be called a true zoom like an optical zoom. In an optical
zoom lens the focal length changes and the mechanism of the zoom extends
itself to retract in order to magnify the lens. Optical zoom is known to
produce the best images in terms of quality. A digital zoom is actually
a simulated zoom. It causes the central portion of the image in a camera
to enlarge. That is, there is no actual alteration in the length of the
lens. Digital zooms are notorious for reducing the quality of the
visuals.
Wide ranges of interchangeable lenses are used in Digital Single Lens
Reflex Cameras (DSLR). DSLR lenses can be compatible with the lenses,
which are used with 35mm film SLR. Many digital cameras make use of
add-on converter lenses.
The popularity of the DSLR cameras is mainly due to their capacity to
exchange lenses and, make the best choice of attachments in terms of
specialized lenses. Range finder cameras in both the categories -
digital and film, share the same feature. The typical among them is
Epson R-D1 and Leica M8. Converters that can be attached to the ends of
fixed lenses are used with compact cameras. This is optional and copies
the usability quotient of multiple lenses.
In DSLRs, the diameter of the lenses is usually larger than in point and
shoots. This translates in the phenomenon of the subject catching more
light. The option of faster shutter speeds has to given for these in
instances of low light or moving objects.
Advancements in digital age designs of zoom lenses have almost
substituted the market for non-SLR cameras of interchangeable lenses
now. Compact digital cameras, which are non-SLR come with fixed lenses.
These have the capacity to from medium wide angle to medium telephoto.
This results in the omission of extreme telephoto and fish eye.
The lenses, which are made for film
cameras, can mostly be used on DSLR cameras. But this is only possible
in instances of lens mounts similarity. This cannot be done in reverse
cases.
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