Well the thing is I have tried to explain why i feel if you want to compare 4:3 to 35mm format you should multiply both focal length and aperture by 2. A 300mm lens is physically only 300mm from the nodal point to the image plane whether it is used on 35mm format or 4:3. We say that a 300mm lens on 4:3 is equivalent to 600mm in 35mm format because the field of view is similiar. If we're going by that logic then we should also say that f2 on 4:3 is equivalent to f4 on 35mm format because 1) the dof is similiar to f4 on 35mm and the shutter speed that you can use is similiar as when you are using f4 on 35mm format as explained in my earlier post. To multiply the focal length by 2 then leave the aperture unchanged just seems inconsistent.
If like in my example that you can get a similiar field of view, similiar shutter speed, similiar dof and similiar image qualiy in terms of noise by using
d700 at iso 1600 with a 300mm f4
e-3 at iso 400 with a 150mm f2
Then how can we still argue that 150mm f2 on 4:3 = 300mm f2 on 35mm format? Just seems to me that we are making adjustments that make the 4:3 system more attractive and leaving out the adjustments that makes it less attractive.
I hope I don't offend anyone in my post. My intention is not really to discuss the pros and cons of 4:3 vs 35mm format but rather looking for someone to enlighten me whether my way of converting is right or wrong (and if so why?).
If like in my example that you can get a similiar field of view, similiar shutter speed, similiar dof and similiar image qualiy in terms of noise by using
d700 at iso 1600 with a 300mm f4
e-3 at iso 400 with a 150mm f2
Then how can we still argue that 150mm f2 on 4:3 = 300mm f2 on 35mm format? Just seems to me that we are making adjustments that make the 4:3 system more attractive and leaving out the adjustments that makes it less attractive.
I hope I don't offend anyone in my post. My intention is not really to discuss the pros and cons of 4:3 vs 35mm format but rather looking for someone to enlighten me whether my way of converting is right or wrong (and if so why?).