Hello
Can someone help this dummy understand focal length as it applies to digital cameras?
First, am I correct when I think that when I used a 135mm lens (non zoom) on a 35mm body (non-digital) the focal length of all pictures will be 135mm?
If the above is correct, then again I think (trouble area here) that if I use the same 135mm lens on a digital body; the focal length is not 135mm.
If my last thought is correct, how do I convert the numbers listed under “Properties” for a digital picture to the focal length I am familiar with, e.g. the non digital 35mm numbers?
Here is where I am having problems.
If I take a picture using the Pentax ist DS, and the Sigma 170-500mm zoom, the focal length listed under Properties can read from 170 to 500 depending on the zoom selection. Can I convert this to the “correct” focal length … or is this correct?
I become even more confused when I hang the Nikon CP-4500 on my Pentax PF-80 spotting scope using a Williams 28mm eyepiece (focal length 24mm). The focal lengths for those photos taken and listed under Properties have a range from 13mm to 32mm. Again I’m guessing this depends on how I zoom, when using the camera’s 1-3 optic zoom. Can this be converted?
Hope this is a bit clearer than Tapioca.
Thanks in advance
Ciao
Dick
Can someone help this dummy understand focal length as it applies to digital cameras?
First, am I correct when I think that when I used a 135mm lens (non zoom) on a 35mm body (non-digital) the focal length of all pictures will be 135mm?
If the above is correct, then again I think (trouble area here) that if I use the same 135mm lens on a digital body; the focal length is not 135mm.
If my last thought is correct, how do I convert the numbers listed under “Properties” for a digital picture to the focal length I am familiar with, e.g. the non digital 35mm numbers?
Here is where I am having problems.
If I take a picture using the Pentax ist DS, and the Sigma 170-500mm zoom, the focal length listed under Properties can read from 170 to 500 depending on the zoom selection. Can I convert this to the “correct” focal length … or is this correct?
I become even more confused when I hang the Nikon CP-4500 on my Pentax PF-80 spotting scope using a Williams 28mm eyepiece (focal length 24mm). The focal lengths for those photos taken and listed under Properties have a range from 13mm to 32mm. Again I’m guessing this depends on how I zoom, when using the camera’s 1-3 optic zoom. Can this be converted?
Hope this is a bit clearer than Tapioca.
Thanks in advance
Ciao
Dick