Below image is what I understand about the functional of aperture.
Besides that, Dr. Dayang also discuss on the issue of the differences of the digital compact camera and the DSLR.
As consumers, there are a few aspects we need to consider before purchasing or upgrade a camera.
Case Study 1:
There are huge differences between the little point and shoot cameras and DSLRs. I'm just highlighting some important differences:
1. Image quality.
A DSLR have much better images quality over the point and shoot camera. It produces awesome image qualities especially the pro level cameras.
2. Responsiveness & Performance.
Point and shoot cameras are not designed to be fast and responsive. Most of the recent DSLR can start and operate instantly.
3. Interchangeable lens
All the point and shoot camera has only one build in lens; thus limiting its ability. For DSLR, you can choose the lens to suit your needs.
4. Easy of use
This is the area that point and shoot camera may have the upper hand. Only a click of a button, she got the image taken. For DSLR, the complex menu setting and control system can easily scare camera novices away.
5. Cost and weight
When you have a better product, you normally expect to pay more. This is true too when it comes to camera. DSLRs are generally much better built with better components and software. For point and shoot cameras, it cost less and weight less too.
I hope that I've summarized the major differences between DSLR and point and shoot cameras. Which one to purchase will be determined by how you want to use it.
For more info, please go to http://www.digital-photography-school.com/should-you-buy-a-dslr-or-point-and-shoot-digital-camera
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