Used to Portrait photography and want to enter in the birdwatching world

Started 3 months ago | Questions thread
A Marcus Regular Member • Posts: 188
Re: Used to Portrait photography and want to enter in the birdwatching world
1

If you mount a lens with a focal length that is approximately the same as the corner-to-corner (diagonal) measure of the format (film or digital sensor), that lash-up is considered to deliver a “normal” angle of view. While not engraved in stone, portrait photographers generally gravitate to a moderate telephoto. This will be a focal length about 2X thru 2.5X normal.

For birding, one generally uses a long lens. A focal length about equal to the diagonal measure is often considered magnification 1. Birding enthusiasts generally work with binoculars 8X (magnification). Now we are talking 8 times the diagonal measure.

When using a full frame 24mm by 26mm 35mm camera, “normal” is usually rounded up to focal length 50mm. Portraiture centers around 105mm and 8X telephoto = 50 x 8 = 400mm.

If the camera is an APS-C (16mm by 24mm) the crop factor is 1.5. For this format 30mm is considered “normal”, portrait centers on 75mm and 8X magnification = 30 x 8 = 240mm.

I think the camera model is not the key issue, it is focal length. Most any camera with super zoom will do this deed.

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