[SJRosa]

Originally Posted by Elmo

I read a little different question so let me answer the question I read.

Let’s start with a normal lens. A normal Focal length lens allows the camera to record an area about equal to area clearly seen by the normal eye. The focal length of this lens will be about equal to the diagonal length across the sensor. As the sensor is about 24x36 mm the diagonal length is about 43 mm. 50 mm is what the industry has said is normal.

Any lens with a focal length over 50 mm is considered a telephoto. As the focal length get longer the telephone power increases. The approx power is the lens focal length divided by 50 (actually 44 is closer) so a 100 mm lens is about the same as a 2 power telescope. A 600 mm lens is about equal to a 12 power telescope.

As the focal length decreases below 50 the angle of view increases (Wide Angle Lens). Due to wide angle lens design an angle of view (power) calculation is not simple like a telephoto. Our only way to determine a WA lens coverage is to look it up in the mfg’s specifications. I can be assumed that the Angle of view will increase as the focal length decreases (as long as you do not compare brands).

So I see in your question the 55-250 will cover a wider angle but not as strong a telephoto as the 70-300.

Of course I might have misread the question. Sometime I do that.

Thanks very helpful!