Yoshizen's Blog

How shallow the Focus can be

This is yet another attempt to create  [Not necessary sharp nor pretty photos] and in here

they are the technical samples.

Lens used was Canon EF 28mm F2.8 but mounted on Canon 5D with Rivers Adapter.

As electronically there is  no connection to the body, F-aperture was fully opened  F 2.8.

And this is not purposely designed Macro Lens  (Macro Lens was designed to give the best

performance at  1/10  of Magnification ratio = if it was 50 mm lens, at the distance of 50 cm

to the object), with fully opened F-aperture, image quality is no way near to a sharp image.

With popular belief, you may be thinking that the Wide-angle lens has deeper depth of field. 

This is only true to the Object side, but not to the image side. 

Think, —– 50 mm lens needs to move 5 mm forward from infinity position to focus 50 cm

distance, but for 28 mm lens, from infinity to 28 cm object (at 1/10),  it needs only 2.8 mm shift. 

In other words, if lens was used in reverse direction, depth of field would be even shallower,

and the out-of-focus image, “Boke” would spread much wider, as you can see in the photos.

But, whether it has any significance to the photography is a matter of individual taste.  😀

The reason why I’m showing this is, this optical effect is a sanctuary in the photography,

away from a hand of Photoshop,  unless a photo was completely repainted pixel by pixel with

human brain.  Make a photo looks sharper is easy but very difficult to reproduce 3D “Boke”.

If anybody think otherwise, Please send me the Sample = Before and After, created by Photoshop.   😀

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2 Responses

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  1. Lemony (Gr)Egghead said, on May 5, 2012 at 18:52

    Love this post! So fascinating.

    • yoshizen said, on May 5, 2012 at 19:48

      This fascination came from the Canon EOS which is based on
      the old philosophy. = hence it allows us to play with any lens system 🙂


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