The image shows the performance of the Pentax 67 SMC 90mm f 2.8 lens - at wide open aperture, but also close to its minimum distance. Here the sharpness drops off a bit - but is helped a little by Topaz Sharpen AI / Photo AI.

When you focus a classic, older lens to its minimum focus distance, especially at wide open aperture, the optical performance / sharpness usually drops a bit. This you also can see with older Leica lenses form the 70s, including the Noctilux-M 50/1 for example. That when you go below 2 meter, the sharpness starts to drop. Older designs didn't feature "floating elements", but had all fixed positions to one another.

When you know it, then you know what is happening and why. So, i do not mind - and I am OK with the drop in performance of the Pentax 6x7 90mm f 2.8 lens. It is otherwise a very sharp lens.

Also i noticed that there wasn't that much of fringing or chromatic aberration going on - despite the diffuse sun was shining behind the flowers, into the lens.

Yes the original photo was a bit overall softer in contrast because of the sun). It was relatively easy corrected in Photoshop.


Retains the feeling of Medium format

I am intrigued from the look of images, actually reminding me of the old days when using medium format cameras. That this now even works with a digital camera, without having to shell out further money on expensive larger sensor cameras... After all, there are no image sensors that can cover a real 6x7 lens' image circle. The biggest of them all, merely covers the smaller 645 format - and as i mentioned earlier, costs 50000 €.

So, here I am, with a Vertex to Pentax 6x7 adapter, and get the equivalent of a 46x46 mm digital sensor. What is there not to like ? It is a dream come true for me, and...

I love the looks in the images.

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