Re: Rodenstock 28mm HR VS Schneider Super Digitar 28XL
First thing I would like to do is show exactly what the falloff of each lens is doing at a given movement. Lenses like the 28mm only have so much movement to fit these tight image circles the wide angles have. In both cases the Image Circle is 70mm for each lens.
In this test on a horizontal sensor ( landscape mode) I used rise on each image to see exactly what the falloff looked like on the LCC BEFORE corrections. My reasoning here is to see how the falloff looks and see if the new Technical Wide Analyze tool in Capture One would make this a easy task to make the correction or the falloff is so bad that we will need center Filters to even out the light falloff across the frame not to mention lens casts that also would be present.
Now from previous experience with the Rodenstock it looked to me that 7mm of movement is possible before bleeding too far into the image circle to cause mushy corners. In this test I shot in 4mm increments of rise so one the corners of each image we can see where it starts to make that transition from sharp to well lets call it mush and unusable. Let me be very clear here I AM NOT USING CENTER FILTERS.
So in the following images you will see Zero movement, 4mm, 8mm and I did 12mm as well to go well over the mark.
As you will see in Rodenstocks wonderful wisdom they use a disk inside their lenses to let you know when that falloff happens. Re read that please. Now my response to that is okay you are telling photographers to stop there and not push it any further. What are we morons. This is stupid folks. Why you ask well if we are out shooting and we want more sky and drop into that unusable area we get lens cutoff , well folks there is no detail in the sky and we may want more anyway. We don't follow rules this is ART we may want 30mm of sky in a image. You can tell this is not making me happy , no one puts handcuffs on what I want to do. Schneider on the other hand says go as far as the wind will take ya . Big bonus point for Schneider. LOL
Honestly I can see why Rodenstock does that and it IS helpful but it is also a restriction if you dare go where you are not supposed to. Why does the movie Easy Rider pop in my head on that comment.