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Stephan's Photography Pages


Links to other digital photography sites

Phil Askey's DP Review

Steve Sander's site

Imaging Resource

Foto Lens (Bellville, South Africa)

Below follows some lens comparisons, and some shadow and highlight processing by special software.


Why you spend extra money when buying lenses.

The following pictures show the difference in quality between the

Sigma 70-300 F4-5.6 II Macro Super and the

Sigma 70-300 F4-5.6 II Macro Super APO

Devil's peak area, Cape Town, South Africa. Not cropped but

Resized to 800x600 from a photo taken at 300mm (480mm equiv)

on the Canon EOS 300D.

Sigma 70-300 F4-5.6 II Macro Super

Cropped but not resized

Sigma 70-300 F4-5.6 Macro Super APO

Cropped but not resized

Sigma 70-300 F4-5.6 II Macro Super

Sigma 70-300 F4-5.6 Macro Super APO


Cropped and resized from full sized photo taken at 300mm once again.

Sigma 70-300 F4-5.6 II Macro Super

Cropped but not resized

Sigma 70-300 F4-5.6 Macro Super APO

Cropped but not resized


Here follows my efforts to solve the problems of high contrast in bright South African light.
I have found the following Photomatix software to do the job, and it does it well. In their own
words I will quote directly from their website:.

"Obtain Details in both Highlights and Shadows"

"Photomatix extends the dynamic range of your digital photographs or scanned films.
This exposure blending software solves the problem of blown out highlights and
loss of contrast in shadows. Photomatix works from images taken under different
exposures, combining them into one image with increased dynamic range. This
process known as HDR compression produces an image that you can display on
monitors or printers while preserving the details of the original scene in highlights
and shadows. "

The examples below were resized for bandwidth reasons. Below the thumbnails follow 800 x 600 pictures
to assist with seeing the details better.

Underexposed (- 2/3 EV)

Correctly exposed (according to frame average metering)

Overexposed (+2/3 EV)

Processed by Photomatix 1.3 beta

Correctly exposed (according to frame average metering)

Underexposed (- 2/3 EV)

Overexposed (+2/3 EV)

Processed by Photomatix 1.3 beta