When talking about camera lenses it's helpful to use the analogy of the human eye. Eyes and cameras work in pretty much the same way, with light going through an aperture (pupil) then through a lens onto a recording surface (retina). As the pupil of the eye contracts to deal with varying light conditions the lens of a camera bends and curves in order to focus, depending on the distance of the subject.
A camera lens is basically two conjoined prisms and because prisms refract light, the rays are bent inwards to meet with each other at a focal point. The point on a vertical surface where the rays meet is the focal place which is where your film or (more likely) digital sensor is placed to capture the image formed by focusing the rays.
Again, I hope you found that interesting and, yep, the photos weren't taken by me...
More bluebells from Kinclaven...you'll probably get
a bit sick of seeing these after a while! Feel free to
comment because I'd love to hear any tips or constructive criticism you might have for me!
Here's something you might find interesting:
The true Scottish bluebell is under threat from hybrids, created through the crossing of Scottish bluebells and Spanish bluebells. These hybrids don't have any scent and out compete the native plant for space etc. So, if you're in to plants you can order a packet of native bluebell seeds and plant them in your garden to help save the British bluebell!
Burn baby burn! I took this because humans seem to have a fascination with fire, and I'm no exception. Flames can make suck interesting shapes so when you point and snap you can be certain every photo will be different. Then, it's just a matter of picking which one you like best.
I've just started the higher photography course at school and I thought I'd share some of my recently gained useful photography know how with you all...
Light waves come in different frequencies that relate to the energy of the wave. As humans, we can only see the visible spectrum which sits in middle part of the frequency table; so we can't see things like gamma rays because they're too high a frequency and we can't see microwaves because they're too low a frequency.
Focusing on the visible spectrum what happens to light when it hits something depends on three things...the frequency of the wave, the strength with which atoms in the material hold on to their electrons and the energy of the light wave. This can create a few different effects:
Like in mirrors. Light rays don't penetrate the object deeply and electrons holding the energy pass it straight back out at the same frequency.
Objects like glass seem transparent because the light frequency is too high to make the electrons vibrate so that the light rays aren't captured and pass straight through the material.
Light rays are slowed down and bent, creating a glittery effect like water on a brilliantly sunny day or diamonds.
Electrons are absorbed so rays don't bounce back and materials are opaque like wood.
Light rays are thrown in loads of different directions by a rough surface like that of paper.
I hope you guys have found this if not helpful, a little bit interesting and by the way, the images on this post aren't my own!