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Pentax smc DA 17-70mm F4 AL IF SDM

Pentax smc DA 17-70mm F4 AL IF SDM
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Pentax smc DA 17-70mm F4 AL IF SDM review: specs and price

Pentax smc DA 17-70mm F4 AL IF SDM

Why is Pentax smc DA 17-70mm F4 AL IF SDM better than the average?

  • Weight
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    485gvs637.88g
  • Minimum focal length
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    17mmvs46.95mm
  • Minimum focus distance
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    0.28mvs0.55m
  • Maximum angle of view
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    79°vs59.46°
  • Optical zoom
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    4.11xvs2.04x
  • Magnification
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    0.31xvs0.28x
  • Smallest aperture at minimum focal length
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    22fvs21.67f
  • Minimum angle of view
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    23°vs40.02°

Price comparison

General info

1.Has a metal mount
Pentax smc DA 17-70mm F4 AL IF SDM
A metal mount is generally superior to a plastic mount as it is more durable.
We consider a lower weight better because lighter devices are more comfortable to carry. A lower weight is also an advantage for home appliances, as it makes transportation easier, and for many other types of products.
A shorter minimum focal length allows you to get more of the scene in the photo, and offers a wider angle of view than longer focal lengths.
A longer maximum focal length allows you to focus in on a small part of a scene, and offers a narrower angle of view than shorter focal lengths.
5.Front element doesn't rotate
Pentax smc DA 17-70mm F4 AL IF SDM
The front element doesn’t rotate. This is important if you use filters, as some such as polarising or gradient filters have to be orientated a certain way.
6.Includes lens hood
Pentax smc DA 17-70mm F4 AL IF SDM
It comes with a lens hood so that you don’t have to buy it separately. These are used to block strong light sources, such as the sun, from the lens to prevent glare and lens flare.

Optics

At the shorter end of the lens you get the widest angle of view. This allows you to fit more of the scene into the photograph (based on APS-C format).
The zoom range is the ratio between the longest and shortest focal lengths. A higher zoom range means that the lens is more versatile.
A true macro lens has a magnification of 1:1. This means that the image produced is a life-size representation of the subject being photographed.
At the longest end of the lens you get the narrowest angle of view. This allows you to fit a small portion of the scene into the photograph, such as when you are zooming in on a subject (based on APS-C format).

Aperture

With a wider aperture the sensor can capture more light, helping to avoid blur by enabling a faster shutter speed. It also provides a shallow depth of field, allowing you to blur the background to focus attention on the subject.
With a wider aperture the sensor can capture more light, helping to avoid blur by enabling a faster shutter speed. It also provides a shallow depth of field, allowing you to blur the background to focus attention on the subject.
The aperture controls how much light gets through to the camera’s sensor. More blades is often an indicator of a better quality lens. It also allows you to achieve much nicer looking bokeh when blurring out your background, whereas a lens with less blades will often produce harsher, more polygonal bokeh.
A smaller aperture reduces the amount of light reaching the sensor. This is important in bright conditions where a wider aperture could result in your image being overexposed. Another advantage is that with a smaller aperture you get a greater depth of field, and can keep all of the image in focus.
A smaller aperture reduces the amount of light reaching the sensor. This is important in bright conditions where a wider aperture could result in your image being overexposed. Another advantage is that with a smaller aperture you get a greater depth of field, and can keep all of the image in focus.

Focus

1.Can focus to infinity
Pentax smc DA 17-70mm F4 AL IF SDM
Many lenses allow you to focus to infinity. This is essential when you wish to take photos including far off objects, such as when shooting landscapes, in order to make sure everything is sharp and in focus.
2.Has focus motor
Pentax smc DA 17-70mm F4 AL IF SDM
Lenses with a built-in focus motor can autofocus even if the camera does not have its own focus motor.
3.has a silent focus motor built into the lens
Pentax smc DA 17-70mm F4 AL IF SDM
Lenses with built-in focus motor focus faster and more quietly than lenses without a focus motor which rely on the camera's body focus motor.
4.Has full-time manual focus
Pentax smc DA 17-70mm F4 AL IF SDM
With full-time manual focus, you can move the focus ring whilst it is in AF (autofocus) mode. This means that you can make manual adjustments once the AF has finished, without changing to manual mode.
This is the closest distance that the lens can focus. A shorter minimum focus distance allows you to get closer to your subject, and is particularly important when doing macro photography.

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