[flockofbirds]

You get a 1.6x crop factor compared to 35mm.

[boodiespost]

im sorry, so what does that exactly mean? If x = 35mm size, apsc = x*??

[noahpurdy]

so whats the ratio of what the aps-c lenes see and what the actual sensor sees on my K-x?
[For the sake of the question, lets say my K-x eyepiece see's 100%]

Page 15 of the K-x user manual explains this.

Angles of view being equal, the focal length of a lens used with a 35 mm camera must be approximately 1.5 times longer than that of K-x. To obtain an angle of view framing the same area, divide the focal length of the 35mm lens by 1.5.

Example) To capture the same image as a 150 mm lens attached to a 35 mm camera
150/1.5=100
Use a 100 mm lens with the K-x.

Inversely, multiply the focal length of the lens used with the K-x by 1.5 to determine the focal length for 35 mm cameras.

Example) If 300 mm lens is used with the K-x
300x1.5=450
Focal length is equivalent to a 450 mm lens on a 35 mm camera.

[boodiespost]

great thank you, i missed it

[Marc Sabatella]

so whats the ratio of what the aps-c lenes see and what the actual sensor sees on my K-x?

That question doesn't make sense; not sure what you meant by it. The sensor sees what the lens shows it. So the ratio is always 1:1 from any practical perspective.

For the sake of the question, lets say my K-x eyepiece see's 100%

Actually, it see only about 96% of what the sensor sees.

[Marc Sabatella]

im sorry, so what does that exactly mean? If x = 35mm size, apsc = x*??

As I said before, if you don't shoot 35mm film, then you can forget you ever heard any of this. The only point of doing the conversion (multiplying by 1.5) is when trying to communicate with someone who shoots film. So if they tell you they use a 50mm lens for some purpose, you'd divide by 1.5 and know you'd need a 33mm lens to get the same effect. Or if you want to to tell them about this great shot you took that required a 300mm lens to get, you could multiply by 1.5 and tell them that they'd need a 450mm lens to get the same shot. But aside from situations where you are talking to someone who shoots film, there is absolutely no point in caring, as I said before. Just as I don't go around converting my speed in MPH to KPH just because I know people in Europe use KPH - I only do that in the very rare cases when I'm discussion driving speeds with people in Europe.

[boodiespost]

great analogy, thanks

[lpfonseca]

I've got 8 FF cameras and one 1/2 frame. Sure do love them all.

well, most FF cameras are rather inexpensive today as long as one doesn't look at the digital ones...