cron 35 v4 / asph - flatness of field

[ampguy]

I've been comparing the v4 35/2 cron, with the larger latest ASPH and am probably through about 25 rolls between the two, finding only very very minor differences.

After reading p10 of the ASPH user's manual on how improved the ASPH is over previous 35/2 crons, I realized I haven't really tested for flatness of field.

I do have one image taken that shows some wild distortion with the v4, note the relative size of the foot in this image.

I'm curious if any others have evaluated flatness of field between the v4 and ASPH crons?

 

[waileong]

What you've shown is a problem of perspective, you're shooting downwards with the leg much nearer to the camera than the face, hence it appears larger on the picture. I think all 35 mm lenses would render it in the same way.

I think flatness of field would be better measured by distortions of straight lines towards the edges of the picture, in other words, things like pin barrel distortion.

 

[ampguy]

thanks

thanks

you're possibly correct. Addl. text in the ASPH brochure says:

"The lens has a larger angle of view than the so-called standard focal lenght (sic) of 50mm, but does not show the marked three-dimensional effect with the exaggerated perspective, typical of wide-angle lenses. These factors allow the new 35mm lens to be used for a variety of purposes ranging from journalistics and travel documentation to landscape and interior photography as well as snapshots."

My sample photo above is probably in the latter category 😉

What you've shown is a problem of perspective, you're shooting downwards with the leg much nearer to the camera than the face, hence it appears larger on the picture. I think all 35 mm lenses would render it in the same way.

I think flatness of field would be better measured by distortions of straight lines towards the edges of the picture, in other words, things like pin barrel distortion.

 

[ampguy]

Haven't been able to replicate the aspect distortion with the 35/2 cron ASPH, tried a whole role of odd types of angles here:

http://matsumura.smugmug.com/gallery/3530492#199598162

 

[waileong]

Has nothing to do with shooting angles.