Sharper Images

Take sharper photos everytime

May
03

Sharper Images

admin on May-3-2010

These days you have to look hard to find a camera that is not capable of taking really sharp photos.  Pretty much any modern DSLR with its kit lens and  most decent P&S cameras are capable of taking pin sharp images.  However it is not at all uncommon to obtain less than perfect results from even the best of cameras and lenses, so don’t feel bad if your photos lack that crisp clear look, you are not alone.  The good news is that you can be taking sharper photos every time, and in most cases it wont cost you any more money, so forget about upgrading to the latest pro camera gear for now.  Just follow the simple steps outlined here.   There are quite a few factors which may be spoiling your image sharpness, but you might even have an “A-HA” moment just skimming this page.


Unsharpness is caused by either movement during exposure which is called blur, or by the image not being sharply focused on the sensor by the lens.

 out of focus sharper images motion blur camera shake

1st pic is out of focus, 2nd is blurred (subject motion) 3rd is camera shake go here for a clearer view and more samples

Subject motion blur is a very common cause of unsharpness.  The only solution to this is either to take a photo when things have slowed or stopped or to use a faster shutter speed.  You can do this by choosing an action program mode (running man symbol); or by choosing a bigger aperture (smaller F-number), and/or a higher ISO sensitivity.  If it is quite dark and you are close to your subject, you might find using the flash will give you sharper photos, though it will totally change the look of your photo.  The flash effects a short exposure time, equivalent to a shutter speed of 1/500th of a second or faster.  You will probably need 1/100th or faster for a child playing and 1/250 or faster for moderate sports action. Your Vibration Reduction VR / Image Stabilisation IS / Anti Shake etc, in your lens or camera will NOT help at all for subject motion.


Camera Blur or camera shake is another common problem.  The same techniques as for subject blur can help for camera shake, but there are more and even better options for more static subjects.  In this case your Vibration Reduction VR / Image Stabilisation IS / Anti Shake etc, in your lens or camera WILL help right down to shutter speeds of 1/15th of a second (YMMV), Reducing camera blur is what it is designed for.

Here is a list of tips to help you steady up that camera to get sharper images:

  • If hand holding the camera choose a shutter speed of  at least 1/ the focal length of the lens (eg for an 18-55mm lens you need about 1/60th at least at the long end, if you have steady hands)
  • Balance yourself, tuck your elbows in, relax and half breathe out, and gently squeeze the shutter button, don’t jerk it.
  • Firing a sequence of shots in continuous motor drive will result in at least one shot being sharper as you are not pressing or releasing the button.
  • Rest your elbows on something.
  • Put a 1/4″ screw in the tripod socket and tie a doubled piece of string to that or even the camera strap lugs. Stand on it or tie it to something solid and pull it taught.  This works amazingly well to very slow shutter speeds.

Rest the camera on something solid. You can position it better with a small bean bag, bag of rice or even a pair of socks if your desperate.  Use a cable release or the self timer to prevent movement from touching the camera. This will work  for any length of exposure time.

Use a monopod.  It is easier to carry and move your position than with a tripod but it is only good for 4to 8x a handholdable speed.  It has the advantage of taking weight off your hands if you are concentrating on a sports match or wedding ceremony for some time.

Use of steady photo tripods.  Don’t go for the lightest or cheapest, get something that will comfortably hold the biggest rig you think you will ever have.  A tripod when used correctly is the safest and most convenient way to totally eliminate camera blur. Place it on solid ground or pushed into the sand, mud or snow.  Raise it by the legs rather than the center column if possible.  Use a cable release or the self timer and mirror lock-up if available on your camera.  I have made a table to help select photo tripods at this site here   It includes details on size weight and capacity.

Even a modest DSLR with half decent lens held steady, will quite often yield sharper photos than even the most expensive cameras and lenses hand held, especially in darker lighting conditions.  Check out our video on reducing camera shake.


Focus Problem.

If the subject is soft but something in front or behind the subject is sharp, the photo is out of focus. This can be caused by fully pressing the shutter button, before the camera has focused correctly, or it is focused on some other position within the frame. Some situations can fool the camera’s auto-focus, such as a backlit subject, or photographing through glass or foliage. If you think you may be having problems getting accurate focus, go to our focus problem page for remedies to that common problem.

Lens sharpness.

If your camera is fitted with a manufacturer branded lens or one of the better 3rd party manufacturer lenses, it should be capable of very sharp images. Most lenses however are not fully sharp at all apertures and focal lengths.  They will be at least very good toward the middle of the aperture range and away from the extremes of the zoom range.  Usually the center of the image will be sharper as well.  Expecting a lens to give corner to corner sharpness wide open at either end of the zoom range could even be disappointing.  For example if you have an 18-55 f3.5-5.6 zoom kit lens, at f8 to f11 it will be close to as sharp as an expensive pro grade zoom, but at f3.5 or 5.6, the pro f2.8 zoom will yield much sharper images. You may need to use a higher ISO or even a tripod in low light to be able to use those smaller apertures (higher f numbers) without causing blur.  The very high f-numbers actually introduce another type of unsharpness caused by diffraction.

Try using these techniques, and you will find even a modest camera and lens will be capable of taking sharper images.

 


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Jun
22

Sharpest & best cheap lens for your Nikon, Canon dslr

admin on Jun-22-2010

In your quest for getting sharper images, like most of us you may have considered getting a different lens.  But which one?  Going from your 18-55 kit lens to your manufacturer’s 24-70 f2.8 is a BIG jump in price, is it going to be worth it? Maybe.  Lets get a few things straight first.  Your Nikon/ Olympus / Canon/ Sony / Pentax kit lens is more than likely very capable of giving very sharp results.  I have not used all of these but I know at least the Nikon lens will give as sharp as the camera can.

Hold on, you say, my lens is sharp enough?  Yes, BUT, within some limitations.  First of all it is sharpest stopped down to around f8-f11 aperture.  Like most lenses, its optimal sharpness is not acheived wide open.  Secondly, it is not a “fast” lens, which means its maximum aperture is not very big, therefore not very bright.  This means slower shutter speeds when it is dark which means more likelyhood of blur, OR, using the lens wide open where it is not as sharp, or a combination of both.  Enter the FASTER lens.

Lets look at the 24-70 f2.8 or 17-55 f2.8 for a start.  At f5.6 it will be sharper than the 18-55 at f5.6.  At f2.8, well the 18-55 wont open up to f2.8 so at the 55mm end, you have a 2 stop advantage or 4 times as fast shutter speed (that’s a quarter of the blur! If motion is a problem)

Here’s the problem though, those lenses are not cheap the Canon EF 24-70mm f/2.8L USM Zoom Lens for example is$1450.  It’s also a lot bigger and heavier, and in bright conditions at least I doubt you will see the cost benefit in this over your kit lens. 

Here’s an alternative solution for you though.  How about an even FASTER (brighter) lens, which is even SHARPER than the 24-70? What if I told you it is very small and light and costs less than a hundred bucks?  So what’s the catch?  Well yes there is a catch, and if you are ok with it you will find this little lens will make quite a difference to your indoor photography.  The catch is that it is not a zoom.  This means if the subject is too close you have to step back, if it is too far, you have to get closer.  (In some ways this is a good thing, because many poor photos are caused by lazy zoom technique, resulting in a bad perspective)  The lens I am talking about is the simple prime lens.  The good news is that these are available for Nikon and Canon.  The Canon 50mm f1.8 is a nice perspective for portraits and the brand new Nikon 35mm f1.8 is a great “normal” perspective for candid portraits and general photography.  The Nikon 35mm is bit more expensive but it’s still under $200.

Yes, there is such a thing as a good cheap lens!

Here’s some pics with the Nikon 35mm f1.8: http://www.flickr.com/groups/afs3518gdx/

Here’s some with the Canon 50mm f1.8: http://www.flickr.com/groups/canonef50mm/

Note how you can get beautiful subject separation using the larger apertures (smaller f-numbers) that are available.


Nikon AF-S DX NIKKOR 35mm f/1.8G Lens   Canon EF 50mm f/1.8 II Lens

Nikon 35 1.8 and Canon 50 1.8, (not to scale, the Canon lens is actually bigger) click on the picture of the lens for more info on it.

These links (the lens images) take you to Calumet.  Like many other pro photographers, I like Calumet for my purchases because they have the best backup service, staffed by photographers, and you save money with the competitive prices.


Shop Calumet Rebate Central to Get the Latest Rebates on Top Brands. New Rebates Being Added All the Time!


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Jun
02

Is it camera shake or motion blur ?

admin on Jun-2-2010

 

A quick look at the effects and causes of camera blur and motion blur


May
05

Take better & sharper digital photos with the half push

admin on May-5-2010

We hear from lots of people that their fancy new digital camera takes blurry photos. Can we let you in on a little secret? It’s not the camera – it’s you. By learning the secret of the mystical half push, you too can take great sharp and in-focus photos.

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