The links that follow are to all the technical photographic articles on the site of Rob's Photography New Zealand. You can see the blogs index  here. 

Advantages and disadvantages of cropping images instead of using lenses with longer focal lengths. This article also gives some examples of the calculation of focal length and it discusses the controversy surrounding the definition of the term "photographic reach".

Relationships between crop factor, field of view, photographic reach, image size, pixel density, and pixel size

Determining print sizes for prints from digital cameras

Why is the pixel size and sensor size of a digital camera important? - Does increasing pixel count increase noise? Big pixels vs small pixels

Amazing image quality of images captured using the Sony Zeiss FE 55mm F/1.8 lens on the full frame 42.4mp Sony A7RII: This page includes a selection of images that demonstrate the excellent image quality and amazing detail that can be captured using this lens. To give you an appreciation of how these images will appear when greatly enlarged, crops of just small areas of the images are included, or the full-sized image is published. A similar page that shows the excellent clarity of selected Sony A99 and A900 images can be seen  here.

Full frame cameras vs APS-C cameras:  Analysis of the crop factor and "telephoto advantage" of an APS-C camera

Appendix 1  of the  above article  shows the image size and pixel density calculations based on  area  measurements.

Appendix 2  of the  above article  includes the following sections:

Pixel level vs image level in digital photography (also refers to the Studio Test Scene  published by Digital Photography Review)

Case study: High ISO low light images of the Sony A77 compared with those of the Sony A55

Downscaling and upscaling images for comparative purposes: can apples be compared with oranges?

Appendix 3  of the  above article  provides a very valuable summary of the approximate mathematical relationships between image size, pixel density, and pixel size (for both linear and area relationships). The information in Appendix 3 can be used as a template for calculating the pixel density and pixel size of any camera with a 3:2 aspect ratio.

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