A DSLR .vs. Cameraphone Quiz

You don’t need to believe my advice that camera phones are now quiet adequate for taking most photos. Test out how good you are at picking whether a photo has been taken on a Smart Phone or a SLR in this CNN quiz

Comparing Cameraphone & DSLR autostitches

These were taken at different times of the day, so the lighting may account for much of the differences in exposure and colour saturation. However in terms of clarity it is hard to see a distinct difference between the resulting photos after being autostitched.

Comparing a Cameraphone & DSLR III

2.0 mega pixel	5.0 mega pixel	14.6 mega pixel
Nokia 6120 classic	HTC Wildfire	Pentax 20d DLSR

My research into what differences between cameraphones continue in this series, and now there is a new smartphone (an HTC wildfire) with a 5 mega pixel camera in the middle. I was looking for a suspected colour bias and saturation, and the tendency to overexpose. All three issues are present to some extent in the cameraphone images and at the same time those photos are adequate as records. In other words having a cameraphone is way better than no photo at all. If you want a really good photo use a Digital SLR. If you just want a record a cameraphone is fine, and they are improving a lot.

Comparing a Cameraphone & DSLR II

.VS.

Clearly at the macro level (Close Up) there is a massive difference in what a simple lensed camerephone and a DSLR with a specialist marco lens captures. Its probably not a fair comparison. Beginning with the exposure, the depth of field, and colour fidelity everything is better in the top row, yet you can still recognize what has been photographed by the phone.

Comparing a Cameraphone & DSLR I

vs
Which is which?

A dirty little secret

My new Pentax K100D isn’t even a week old, and horror, there is a black dot in the middle of the picture, there it is again in exactly the same place on the next frame, there again, and again…. My first thought was a dead pixel, nothing in the troubleshooting about that, in fact dots on pictures aren’t mentioned anywhere in the troubleshooting section or the index…. What it did find, after a lot of looking, was instructions to clean the CCD, and yes that was the problem. Something like dust on my CCD, that goes all the way back to my first photos I just didn’t notice them at the time. Yes tem, there were at least three. So the dust was in the camera when I purchased it (or as I screwed on the first lens)

Cleaning the Pentax wasn’t hard but it must be done with care, follow the instruction in the manual exactly. There is a menu item to lift the mirror and you can use a blower (not a brush blower) to gently blast air over the CCD. There are numerous warnings, to many to cover here. SO READ THE MANUAL! However I had to do it four times, which brings me to the real purpose of this blog post.

How do you know that your CCD requires cleaning?

It is easy to test for a dirty CCD. Aim you camera at the sky on a nice clear day, away from the sun, so the sky is evenly exposed. Take a few exposures moving the cameras around. A few clouds, a bit of a tree or horizon can help you make sure you do this. Then upload the photo to your computer and have a look at a large magnification, in software that lets to scroll from one image to the next. If to see a shadowy spot and it is the same position within the photo frame its very likely to be dust on the CCD


WARNING: looking around on the net with the key words like digital, slr, cleaning, ccd, cmos it would appear that the web is awash with complaints and horror stories. Also some of the articles may not be all that well informed. If you can not find instructions in your camera manual be careful about trying to clean its CCD. In fact don’t, take it back to the dealer, or a reputable camera shop. Nikon digital SLR owners must pay particular attention to Nikon’s disclaimers about this. If you own a Nikon I suggest you read the article by thom about cleaning your camera.