daimo

原帖由 jake123 於 2008-7-28 17:47 發表


Other than deeper depth of field(about one stop more for crop?) and the characteristics of the lenses themselves, what are the differences?

what I was trying to say, simply:

If I compare a 50mm with a 1.5x camera vs a 75mm (ok, assume there is such a model) with a full frame camera,

Although they will have the SAME crop ratio, but due to the difference in the compression ratio, a portrait taken with a 75mm + FF will have a slimmer face.

Catpiano

  so .. all of us OLD CAKES ..  are trying to explain??   lol ...

jake123

原帖由 daimo 於 2008-7-29 09:37 發表


what I was trying to say, simply:

If I compare a 50mm with a 1.5x camera vs a 75mm (ok, assume there is such a model) with a full frame camera,

Although they will have the SAME crop ratio, but du ...

Well but wt I've read from some books is like you take the ideal perfect 14mm lens and the perfect sensor/film and then you crop, say a 50mm field of view, then you will the same perspective as if you were using a 50mm lens. Please correct me if I am wrong. I'm just a beginner.


SB: Yea I should have said "apparent" depth of field.

daimo

What you read from those books is not true.  I suggest you take a look at the Kodak professional guide for photography.  

Jake, pardon me for being too lazy to explain, but you can do a test with a zoom lens ...

jake123

原帖由 daimo 於 2008-7-29 17:56 發表
What you read from those books is not true.  I suggest you take a look at the Kodak professional guide for photography.  

Jake, pardon me for being too lazy to explain, but you can do a test with a z ...

Thanks, I will do my own experiment.

[ 本帖最後由 jake123 於 2008-7-29 18:19 編輯 ]

Catpiano

Yeah ..  jake .. what u read from that book .. is not totally true ..  

You may see the MAIN OBJECT  ..  look kind of the same ..  but not really .. ( ie more distortion )

It is really hard to explain ..    just like when I started doing 35mm .. people compared that to MF .. or FF ..  such as " 80 mm on MF = 50mm on 35mm format ..  "   I was ..   " what the heck ?? "    but once you try it, get the idea ..   then NO PROBLEM!!

Again, just buy some books from chapters ..  

I am happy with 2.0x, 1.6x, 1.5x , 1.3x as well ..  but never hv the same " AIR FEEL "  as FF ( or call old cake feel )  same as 35mm format, never get the "AIR FEEL"  ( or 3D feel ) as MF ..  

When we are here comparing APS  vs 35mm format ..   I am sure some DMF users are trying to explain to FF (35mm format) users as well .. lol