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PostPosted: Mon Jun 18, 2012 1:27 am 

I didn't know where to post this topic, and since I shoot Canon, this would be the logical place...
So, we all need the more MP the sensor has the better the lens needs to be in terms of sharpness & resolution.
There are some amazing Canon lenses that can make super sharp images, but lately with the high MP count sensors they seem to be struggling. On the other side, even old medium format camera lenses coupled with +40 MP backs, seem to be delivering much more than the FF, and most are similary priced or cheaper.
The images that come out of MF are much better in IQ, sharpness etc.
Why don't MF lenses encounter so much problems such as FF, it seems they like the high MP count...
Is the manufacturing process any different, such as quality control, quality of materials, or there is another story to it?
Anyone :?:

PostPosted: Mon Jun 18, 2012 2:54 am 

Joined: Tue Oct 26, 2010 8:22 pm
Posts: 498
Location: 1 AU from the nearest star
40MP is not the same between a crop, full frame, or medium frame sensors.
A medium frame lens is expected to cover a medium frame sensor, which is significantly bigger than a full frame or crop frame.

Here is a good picture to show you the relative size difference.

Try filling up each sensor size with 40 circles of the same size, and you get an idea of how big those pixels are. The smaller the pixel, the less tolerant it is with a lens.

Also, unless if the lens is old, for the same specs, a crop frame lens would cost less than a full frame.
The same can be said for a full frame lens versus a medium format lens.
The less the sensor size of the sensor it is supporting, the less glass that is needed.

Canon 5DIII, Rebel XTi/400D
Canon EF 16-35mm f/2.8L II, 24-105mm f/4L, 50mm f/1.4, 70-300mm f/4-5.6 DO, 85mm f/1.8
Sigma 150mm F2.8 EX Macro

Sigma 10-20mm f/4-5.6 EX, Canon EF-S 18-55mm f/3.5-5.6 II
Canon 430EX II
Opteka 13mm, 21mm, and 31mm extension tubes
Vivitar 50mm f/1.8 for OM System

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