# Is a 300mm @21mp same as a 600mm@10mp?

Started Nov 14, 2008 | Discussions thread
Re: you get some things wrong.

saynomore wrote:

On the whole, your implying that longer lenses are the best-quality
solution is right, but there's almost always money considerations.
focal-length limited. Anyway, we don't know about the OP. If he can
afford longer lenses, we'll agree that that's what he should get
(until he's focal-length limited, then higher density cameras would
be more relevant).

Pixel density does matter. Your calculations are not right because
they don't take density into account. I'm too lazy to confirm
Andrew's numbers above right now, but for example this you said:

Actually i am very much right

Leave the math to people who are not too "lazy",don't draw conclusions without having basic knowledge of math or digital technology.

300mm on your 1DIII is equal to 300mmX1.3(cameras crop factor) this
means its like using a 390mm on a 1DsIII.

is wrong. Andrew's number is more like it. You should take pixel
density into account as well.

I did took pixel density into consideration,read my post,don't be "lazy"(or not-smart)

It's also true that the 50D or 1DsIII
might give you "softer" pixels,

It will DEFINITELY give you a softer image

but that's due to the AA filter (the
L lenses in question are very much up to par with that kind of
density), and unless you got detailed empirical tests of that,

I
don't think it's right just dismissing density out of hand.
Higher-density cameras have been used by birders for years, some
preferring the 1.6 crops over even the 1D cameras.

Find me one,ONE professional (and by that i mean someone who makes his living out of the pictures he shoots),that will prefer a 50d over a 1DIII for ANY KIND OF PHOTOGRAPHY

i am assuming you mean if you crop the image from the 20mp cam will
it be the same as an image from 10mp with a higher zoom

[...]

Now if you put your lens on a 1DsIII and crop each side by 50%,thus
making a 10mp image it would give you 50% more zoom

[...]

So switching to a 1DsIII will give you 450mm(on 10mp crop) versus the
390mm you are getting now,plain speaking 60mm more,or 15.384% more
zoom.

You didn't really mean "zoom" did you?

What else would i meant?

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