What is coming in Digital Photo Calculator v.3?

DPC is long overdue for update and the new version is coming out soon with many improvements. What is coming? There are major improvements notably in the user interface design, in the Sun and Moon module and in the...

Continue reading →

Camera profiles for Lightroom and ACR

Adobe DNG Profile Editor and X-Rite ColorChecker Adobe DNG Profiler is available as a free download from Adobe.com. It can be used with regular X-Rite Color Checker Classic, X-Rite Color Checker Mini and with the 24-patch target of X-Rite Passport. X-Rite...

Continue reading →

SD card to computer performance

This post is a brief overview of read and write performance of several SD cards that may be of interest to photographers with cameras that do not take advantage of high performance of the latest SD cards, but who have newer computers with...

Continue reading →

Leica M startup delay

Most mid-level or better digital cameras have a negligible startup delay of around 0.2 seconds. Alas, Leica M startup delay is often measured in seconds, which may be a problem for some shooters and scenarios. Photographers on Leica related...

Continue reading →

Chromatic Aberration Removal in Lightroom

Lightroom 4.1 introduces new CA removal tool that addresses all types of chromatic aberration. The tool is very easy to use and does really good work. You can select automatic correction, use color picker to select the fringe color(s)...

Continue reading →

Joseph Nicéphore Niépce

The earliest known permanent photograph is the View from the window at Le Gras by Nicéphore Niépce. The photograph was exposed by camera obscura on bitumen coated plate. Bitumen is sensitive to light, but not much. Eight hour exposure...

Continue reading →

Canon EF 70-200mm f/4 L IS USM vs. EF 70-200mm f/2.8L IS II USM

There are many great reviews of those lenses, some links are provided at the end of this post. Focus of this non-scientific mini test is to add information  how the two lenses compare in aspects that I did not...

Continue reading →

Crop factor and DOF

Factors impacting depth of field (revised) Depth of field  (DOF) is impacted by the following factors: Factor Details Aperture The wider the aperture opening, the narrower is the depth of field. Focal length The longer the focal length, the narrower the DOF. Camera to subject distance Sorter distances...

Continue reading →

Redeeming App Store codes

Did you receive codes for free app download from the App Store? Here is how to redeem the codes from your device. Open the App Store app Go to the Featured tab Navigation bar on the top should now show New button Scroll...

Continue reading →

How to measure Dmax and Dmin with X-Rite ColorMunki Photo

This article describes how to measure maximum density (Dmax) of your prints with X-Rite ColorMunki Photo. The same can be applied to measuring Dmin. Find suitable print Find a print that has reasonably large patches of maximum density. I like to...

Continue reading →

Digital Photo Calculator released

Digital Photo Calculator is an iPhone application, researched and developed to help digital photographers with sensor-related and color-related calculations. Some practical examples Find maximum resolution achievable with your camera. If you know your sensor type (APS, FF etc.) and resolution in...

Continue reading →

Lens profiles for ACR and Lightroom 3

Adobe Labs released Lens Profile Creator utility that enables creation of custom lens profiles for Photoshop CS5 (ACR 6.1) and Lightroom 3. This page contains profiles for some Zeiss ZE lenses for Canon EOS 5D II that I created using...

Continue reading →