70 – Getting sharper images – common problems

August 5, 2009 on 8:06 am | In Photography podcasts, Photography tips, podcasting

Photography podcast #70 discusses why sometimes our photographs do not appear sharp enough.  We touch on several important factors that all compromise image sharpness. For newbies in particular, we also mention the depth of field guide which clearly tells the photographer the zone of sharp focus (in feet and inches or centimeters and meters depending on the guide) to expect with a given aperture and lens.

Depth of field guide

Depth of field guide

Links /resources mentioned in this podcast:
Portable depth of field guide from B&H
Free depth of field table for most digital cameras

August’s  “Water”  assignment on the Photography.ca forum

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feel free to join our friendly :) Photography forum

Thanks as always to everyone that sent comments by email about our last podcast. Although ALL comments are appreciated, commenting directly in this blog is preferred. Thanks as well to all the new members of the bulletin board.

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  1. Marko, just a note about sharpness, paople may also have focus sync problem, which can be called Back or Front focus, usually you cant see much on your viewfinder but sometimes the camera autofocus is not tack sharp calibrated so the lens will focus a bit before or after the subject and the result will be seen on the computer. Some cameras such as D300 (http://www.focustestchart.com/focus21.pdf) or 50D on Canon have the lens calibration option, so you can repir it yourself. Lower end cameras do not have this option because I suppose the manufacturers do not care specially because people will be usng kit lens.

    Comment by JackLabel — August 6, 2009 #

  2. [...] we get tons of questions about blurry images. Have a listen to Photography.ca’s podcast on getting sharper images and you’ll solve some, if not most, of those [...]

    Pingback by Weekend Perusing: Florence Afternoon 21 | Your Photo Tips — August 7, 2009 #

  3. Hi Marko –

    Very nice podcast (as usual).

    Regarding photographing birds in flight, I’d recommend someone starting out to practice on larger birds such as eagles, gulls, the larger herons and egrets, etc. They fly slower and less erratically.

    A shutter speed of 1/1000 is a useful starting point.

    One strategy that was recommended to me is to pre-focus on a certain point and then start tracking as the bird approaches that point. This is useful when there is a nest or favorite perch that you can anticipate the bird returning to.

    I should add that I am far from being at the pro level, but I’ve been working on it for some time and benefited from advice from some of the best bird photographers.

    For a challenge, try photographing swallows in flight; they are very fast, small, and their flight is erratic. I have yet to get a really good image with the bird in focus and taking up 80% of the frame.

    If anyone can offer advice, I’d be more than appreciative.

    Comment by Kent Wilson — August 10, 2009 #

  4. [...] Along with a high shutter speed for moving objects, and good depth of field, the quality of your lens has a lot to do with image sharpness. Shutter-speed may affect the sharpness of your image if you get to a point where you’re too slow to hand-hold. In general though, most digital images need a tweak in sharpening. A digital photo that was shot with a good depth of field and a high shutter speed will normally be blurrier  than the same image shot from a film camera. To go about sharpening, photoshop (or Gimp) have tools (like unsharp mask and smart sharpen) to help you make your images nice and crisp For more information on keeping your images crispy.. err.. crisp, read more check out this link on our photography forum and this link to a podcast on getting sharper images. [...]

    Pingback by Thinking Sharp — August 16, 2009 #

  5. Marko -thanks so much for sharing this content rich, informative podcast with us! The information is great for newbies and more advanced practitioners of photography!

    For me personally, the information was just what the doctor ordered!

    Comment by Susan — August 18, 2009 #

  6. Todd5DII from our forum posted this on the forum so I thought I’d copy it here. Thanks Todd!

    Just a few points that were not covered in the Sharpness Podcast

    Remote trigger and Mirror Lockup
    If shooting landscapes or fixed subjects use mirror lockup and remote trigger, this will eliminate a lot of vibration based softness

    Tripods
    Be sure to lock up the legs, head, and if long lens the attachment ring, I have seen a lot of new photog’s shoot “Loose” which is never a good idea (hey everyone gets tired of repositioning but which takes longer, doing it right, or going back and re-shooting?)

    IS – Image stabilization, generally if tripod mounted turn it off, unless there is a lot of wind which makes the tripod “Vibrate” it will soften the image (try it sometime and see what I mean.

    If handheld turn it on: Shoot in bursts (Linda Tharp suggested this, it does work if you are close to or below a shutter speed that is optimal, not sure why but I suspect the rapid shooting captures images between hand tremors, try it sometime!)

    Lens Diffraction – DOF and Sharpness often work agains each other, just because your lens can go to F32 doesnt mean that’s where you should put every time. A good link to tell you how your lens performs in regards to sharpness at various F/Stops is http://www.slgear.com for instance http://www.slrgear.com/reviews/zprod…is/tloader.htm

    Other Software Tips
    There is software that can also help if you did everything else right.

    DXO – Fixes lens aberations, can even make the canon 100-400 useable at 400mm f/32! Does require you to remember distance shot if using canon (damn you canon!) since they dont embeded focus info into EXIF

    HeliconFocus – Blends multiple images with different focal points (works well when little or no movement expected)

    Paitience
    LOL, of light or some other factor is not critical remember wind does come and go in cycles, be paitent. Also you can up the ISO to 400 easily when nessecary on modern cameras, if you shoot the histo to the right a bit you can even do 800 with moderate noise processing to get pretty useable images these days

    Todd

    Comment by admin — September 1, 2009 #

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