|The tests I would do if I can't find a digicam review site for a camera:
||[Dec. 20th, 2009|05:10 pm]
Before you buy a digicam check out the following problems that can plague your pictures.|
It'd probably take a little too much time in-shop - you'd more likely need a friend with the camera so you can do these tests.
Picket fences receding into the distance, a net, or anything with rows/columns getting narrower...
See where the resolving stops, and also check for herringbone patterns, and coloured moire patterns. Finding either is bad.
Example - colours on the fence when there aren't any...
And on shirt:
Pincushion / Barrelling test...
Take a picture of a brick wall front on. Now open an image editing program, and draw straight lines from one side of picture to the other, and from top to bottom, along the cement lines. Is the cement lines curved? How much? Less is good!
The effects you're looking for:
Purple/blue fringe test...
Stand under some trees on a hazy day (white sky). Take pictures through the foliage and branches. Magnify the images you took, and look for purple fringing... less is better.
Take some pictures with the high ISO setting the camera has. Magnify the images and check for speckles of blue/green/red squares, less is better.
The colored speckles on this window don't exist:
Take a long exposure with the lens cap on (30 seconds +) Open in image editor and turn brightness and contrast up... is it even, or are there purple glows near some edges? That's electronic components interfering with the image taking. Less is better.
More splotches are bad...
Image taking speed FPS :
How many pictures per second can you crank out in nice bright conditions? More is better!
Blown highlight warnings :
Take a picture of a bright sky or some swans close up - check the cameras preview window. Can you turn on an option that shows "Blown highlights"? It's a feature in-camera that flashes over the image a warning color to show you were the light was so bright, no information was stored... it's ALL full white. This is a great feature - if you've ever take pictures of swans and had them come out as white featureless blobs - you need this feature!
This one isn't in camera - but it looks the same (apart from the controls on the right!)
This is where the edges of the image get darker. It's the fault of a bad lens. Less is better!
My tests mostly test the lens - although there's some for the camera. Like ISO settings.
If you're happy with the above effects being minimal enough for you, then it's a good camera.
Are there any more rough-and ready (non-studio) tests I can add to these?