Copyright & Commercial Photography

I found this link really helpful, it was interesting to see how commercial photography and copyright work.

http://www.propertydigital.com.au/docs/copyright.pdf

Lens Aperture and Aberrations

Lens Aberrations
"Aberrations are departures of the performance of an optical system from the predictions of paraxial optics."
-http://en.wikipedia.org/wiki/Lens_aberrations

Spherical Aberration
"A type of lens aberration which causes blurriness, particularly away from the centre of the lens"
- http://en.wiktionary.org/wiki/spherical_aberration

Chromatic Aberration
"an optical aberration in which the image has colored fringes."
- http://wordnetweb.princeton.edu/perl/webwn?s=chromatic%20aberration

Astigmatism
"A defect of a lens such that light rays coming from a point do not meet at a focal point so that the image is blurred.."
- http://en.wiktionary.org/wiki/astigmatism

ZOOM zoom.

the zoom lens that we had choose was the Nikon 55mm to 200mm zoom lens.
as asked in part one we had to find a vertical and horizontal lined subject and make it as square as possible. we tested at both extremes of the lens, took a photograph or the scene on 55mm zoom..


and then the same scene on 200mm zoom..



..after that we moved the zoom lens to many different zoom lengths and then looked at our images, decided on which image created the sharpest, strongest view, without distortion which happened to be at 70mm on the lens.


part two asks us to take a range of photographs at different zoom settings and try to establish at what point in the zoom the chromatic aberration appears. We found a small amount yet we were unable to fix the image using Photoshop as to much green or to much red in the image.

Lens

Wide Angle
"A camera lens having a wider than normal angle of view (and usually a short focal length)"

Zoom
"a camera lens that magnifies the image"

Long Focus
"A lens in which the focal length is much greater than the diagonal of the film format (or standard lens)"

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Fish eye
"A fisheye lens is a wide-angle lens that takes in an extremely wide, hemispherical image"

Quasi Fish Eye
"A lens produces an image on the film that covers the entire frame"

Catadioptric
"A lens that uses reflected and refracting surfaces to form an image. More commonly known as a mirror lens."

Macro
"Macro lets you get very close to subjects but have very shallow depth of field."

Teleconverter
"A lens with a very narrow field of view."



Refrences:
Google, MiMi.hu

Assignment, :Lens & Lightmeter

AF-S Micro NIKKOR 60mm f/2.8G ED




This lens lets you shoot as close as 18.5cm /7.28 in. It has a “Nano Crystal Coat” which reduces ghost and flare lighting problems in backlit situations or when shooting towards a light source, while two aspherical lens elements and ED glass deliver precision for your close-up photography. The picture angle is equivalent to a 90mm lens in DX-format.

Optical construction: 12 elements in 9 groups incl. 1 ED and 2 aspherical elements
Number of aperture blades: 9 (rounded) min. focus distance0.185m (max. magnification ratio 1:1)
Dimensions: 73x89mm
Weight: 425g
Filter size: 62mm (non-rotating)
Hood: Nikon HB-42, barrel shaped, bayonet mount (supplied)
Other features: Nano Crystal Coating.
Constant physical length: (true IF design). Silent-wave AF motor.

Notes from class - Week 7

Photography Technology, week 7

Digital capture continued
Light meters
Tungsten lighting


Assignment can be blogged, but need to hand it a hard copy to the teacher :S
Pick one lens and one light meter to research, do an in-depth study of each. More info on assignment sheet.
DUE MAY 31ST



Digital Capture


“Dose size matter?”

-larger size = more photosites, more resolution
-smaller size = easier to take out.

135mm film size
Originated as cinema film
Its 35mm wide.
Image area: 24mm x 36mm
Half frame compact cameras
Sensor array size
Full frame sensor =24mm x 36mm
Smaller sensors defined with a crop factor;
Eg: 1.5 X
1.6X
Crop factor relates to the cropping of the angle view as a result of the smaller sensor.


Tungsten Lighting

There are 3 types of Tungsten lights
Filament
Halogen
Discharge


*-glass envelope filled with argon/nitrogen mix
-low output
-100 hours of life.
-output and colour temp changes during life
-increase voltage = shorter life.

**
-3200k
-quartz envelope. Halogen gas, added to gas mix
-moderate output
-life 25-200 hours
-more constant output and colour temp
-never touch envelop when hot
3]
-5600k daylight balance.