@littlegreen

As the nikon D40 doesn't has a internal motor, and if you want to AF, the lens u're using need to have the focusing motor...

Since u're using a old tamron lens, most probably it doesn't has the internal focusing motor and therefore you can only manual focus it. You can't AF on old lens.

@littlegreen

Full frame (FF) means the size of the sensor is equal to the size of a 35mm negative. Normally DSLR have a crop factor of either 1.3, 1.5 or 1.6 depending on models. But high end models offers FF, for example the canon eos 5D. When on FF, you get what you see, ie your focal length will be exactly as it is.

@ifer

D40 good buy? Maybe i'll consider getting it? hehe Shooting film and digital together gonna be fun haha

@clemong

Yeah... shooting on both sys gonna cost me a bomb. That's why im still on film now. Film rocks haha...

@ming

Since the D40 doesn't has a internal motor to do the AF, the lens that you used on this body got to have that AF motor.

Yes, the longer the focal length the smaller the apeture will get ( big f no ) as you're only using the kit lens. Most probably at a short distance to the model and at the lowest apeture for the current focal length ( f/5.6 at 55mm ) you'll still get some bokeh.

This post has been edited by kenlui: Oct 11 2007, 01:27 AM