What determines the minimum focal length on a zoom lens?

Answer I think you're confusing focal length and minimum focus distance. Minimum focus distance is just the minimum distance the lens needs to achieve focus -- in this case, about 1.3 feet.This number is ... Read More »

Top Q&A For: What determines the minimum focal length on a z...

If the distance from a converging lens to the object is less than the focal length of the lens what willl the image appear to be?

What is a camera lens focal length conversion factor?

Due to the size of the sensor in a lot of digital SLR cameras, focal ranges are magnified when using traditional 35mm lenses by the focal length conversion factor.SignificanceEntry-level and mid-ra... Read More »

How to find out the focal length of a telescope for lens?

For most purchased telescopes, the focal length of the objective lens will be printed on the lens' mounting ring, and it will definitely be stated somewhere on the packing box and in the literatu... Read More »

How can I find the Focal Length or F-number of a lens?

The f-number is a ratio, just multiply the effective aperture by the f-number to get the focal length.It works this way because it gives repeatable results - no matter what the effective diameter, ... Read More »