Photography Notes

Home, 2008-04-22

Incoming
Photographers
Sensor sizes
Interesting Lenses
Sigma
30mm F1.4 EX DC HSM
18-50mm F2.8 EX DC
28mm F1.8 EX DG ASPHERICAL MACRO
Sony
SAL 28mm f2.8,
Tamron
SP AF17-50mm F/2.8 XR Di-II LD Aspherical [IF]
Tokina
Fixing stuff
M42
shopping
Articles
Theory
Taking Photos
The Digital Darkroom
Printing
DPI
Illux
Pixum
(0.57 øre/cm^2).
Billedbutikken
Kodak Easyshare Gallery
Other shops
DCraw
Gimp
8 bit versus 16 bit
Documentation Etc.
Plug-ins
ImageMagick
Workflow
Organizing Photos
Unix specific
Applications
Misc
Links
Personal websites
Communities
Photographers
Praktica MTL5B
Battery
Projects
S70

IncomingContents

PhotographersContents

Sensor sizesContents

Designation Width Height Area
1/3" 4.800 mm 3.600 mm 17.280 mm^2
1/2.7" 5.371 mm 4.035 mm 21.672 mm^2
1/2.5" 5.760 mm 4.290 mm 24.710 mm^2
1/2" 6.400 mm 4.800 mm 30.720 mm^2
1/1.8" 7.176 mm 5.319 mm 38.169 mm^2
1/1.7" 7.600 mm 5.700 mm 43.320 mm^2
2/3" 8.800 mm 6.600 mm 58.080 mm^2
1" 12.800 mm 9.600 mm 122.880 mm^2
4/3" 18.000 mm 13.500 mm 243.000 mm^2
APS-C (1.8") 23.700 mm 15.700 mm 372.090 mm^2
35mm 36.000 mm 24.000 mm 864.000 mm^2

Examples:

More about sensor sizes: http://www.dpreview.com/learn/?/key=sensor+sizes

36 x 24 mm 5D
28.7 x 18.7 mm 1d mk 3
22.5 x 15.0 mm 30D

Interesting LensesContents

Sigma Contents

http://philip.greenspun.com/photography/sigma-lenses

http://www.fovitech.dk/fotodok/sigma/sigmobj/index.htm

30mm F1.4 EX DC HSMContents

18-50mm F2.8 EX DCContents

28mm F1.8 EX DG ASPHERICAL MACROContents

SonyContents

SAL 28mm f2.8, Contents

TamronContents

SP AF17-50mm F/2.8 XR Di-II LD Aspherical [IF]Contents

TokinaContents

Will bring out a 16-50mm f/2.8 zoom in 2006. Tokina 16-50/2.8 is delayed until February,

Fixing stuffContents

M42Contents

shoppingContents

ArticlesContents

TheoryContents

Taking PhotosContents

The Digital DarkroomContents

PrintingContents

DPIContents

dpi 9 x 13.5cm 10 x 15cm 13 x 18 cm 20 x 30 cm 30 x 45 cm
50 177 x 266 197 x 295 256 x 384 394 x 591 591 x 886
100 354 x 531 394 x 591 512 x 768 787 x 1181 1181 x 1772
150 531 x 797 591 x 886 768 x 1152 1181 x 1772 1772 x 2657
200 709 x 1063 787 x 1181 1024 x 1535 1575 x 2362 2362 x 3543
250 886 x 1329 984 x 1476 1280 x 1919 1969 x 2953 2953 x 4429
300 1063 x 1594 1181 x 1772 1535 x 2303 2362 x 3543 3543 x 5315

Pixels needed to reach a certain dpi

Pixum recommends 111 pixels/cm = 282 dpi.

IlluxContents

Art printing (DK): http://www.illux.dk 60x90 dkk 1000.

PixumContents

They provide a rather limited application for windows to build the order with. It is possible to switch picture optimization off, but only for the whole order (a check box is shown when the order is placed).

(0.57 øre/cm^2).Contents

BilledbutikkenContents

They provide a colorprofile (although I have heard it does not fit the result). It is possible to switch picture optimization off, but only for the whole order

Kodak Easyshare GalleryContents

KEG (http://www.kodakgallery.eu.com) also makes photobooks on qualitypaper.

Other shopsContents

DCrawContents

GimpContents

8 bit versus 16 bitContents

Gimp does all the manipulation on 8bit representations of the channels. In theory this will have a prize on image quality compared to programs which supports 16 bits per channel. To see for myself how much difference there is I took an image (jpg, 8 bits per channel) and edited it in both gimp and photoshop (in 16 bit mode), I did the following: adjusted levels, adjusted saturation, rescaled to 33% (cubic/bicubic), and sharpened with unsharpen mask. I then exported the image from gimp to a tiff-file and read it into photoshop to compare the images at 400%, there was very small pixel differences, but neither I or my brother could spot any differences.

Documentation Etc.Contents

Plug-insContents

Noise Removal:

Misc:

ImageMagickContents

Remember -quality 100 (best) if working with transformation of jpegs.

Append/concatenate pictures, usefull to create contact sheets:

convert -append <top-to-bottom>/+append <left-to-right>

Borders, create a black border of n pixels around the picture:

convert -border <n> -bordercolor black

Crop:

convert -crop <width>x<height>{+-}<x>{+-}<y>{%} (offset for top left corner)

Identify, find image dimensions: +--- identify +---

Normalize (similar to auto levels in a level tool):

convert -normalize

Resize, use only the width to keep aspect ratio:

convert -geometry <width>x<height>

Resize filters (use with -filter type): Point, Box, Triangle, Hermite, Hanning, Hamming, Blackman, Gaussian, Quadratic, Cubic, Catrom, Mitchell, Lanczos, Bessel, Sinc.

WorkflowContents

Organizing PhotosContents

Unix specific Contents

ApplicationsContents

MiscContents

LinksContents

Personal websitesContents

CommunitiesContents

PhotographersContents

Praktica MTL5BContents

BatteryContents

BTW is it true that this camera takes SR44 silver oxide batteries
rather than 625 mercury ones?

You're correct about the batteries. The lightmeter is of the
Wheatstone Bridge type, which basically means that the actual voltage
of the battery is not important, and the accuracy of the meter does
not suffer as the battery voltage decreases through age. Any small
cell that would fit will work, I use the alkaline LR44 which is the
same size as SR44, only usually cheaper.

ProjectsContents

S70Contents