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 Originally Posted by keithwms
There seems to be quite a fascination with fast lenses now.
It's because fast lenses are awesome. Just ask your Camera of Death. 
But yes, the "N" model is the newer model and is clearly labeled as such. I have one. Took a bit to get used to, but I like what it can do.
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I see what you mean. My 55mm has an N after the 1:2.8 so that's good 
I found some 1.9s at KEH, but truthfully I was expecting them to be cheaper...
I guess I'll use my own lens and wait for the price to go down.
One thing that I did not know is that I would need a lager MF lens to get the equivalent of my 50mm prime (35mm film). I believe I need an 80mm for that, right?
Thanks,
Santiago.
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 Originally Posted by dustbunny
One thing that I did not know is that I would need a lager MF lens to get the equivalent of my 50mm prime (35mm film). I believe I need an 80mm for that, right?
You need a longer lens to get the same field of view on medium format as 35, yes. There's no perfect math for this, especially since the aspect ratios are different, but a way to get a rough idea is to take the focal length for a 645 lens and divide it by 1.6. So...
80 / 1.6 = 50
Therefore, an 80mm lens on 645 format is roughly the equivalent of using a 50mm on 135 and is thusly a "normal" lens for 645. This is the reason why as you go to larger and larger formats, you have less and less depth of field at the same fields of view since longer focal lengths have less DoF.
Obligatory 80mm 1.9 visual propoganda:
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More and more reasons to get a 1.9 
I'll learn the camera and medium with my 55mm and keep an eye for a bargain 1.9. I'll get one eventually!
Santiago.
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The 55mm f2.8 is also a fine lens, and very compact.
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