Pentacon 29/2.8 VS Pentacon 30/3.5

[D1N0]

The 29 can focus closer though up to 25cm instead of 35 for the 30:

29:
close focus distance 25cm by The lens profile, on Flickr

30:
close focus distance 35cm by The lens profile, on Flickr

[Gerald]

The real focal length of the Pentacon 29mm F2.8 lens is more than 30mm; if I remember well it is about 30.5mm.

[D1N0]

Then why not call it 30? I will test on a tripod.

Meanwhile Bokeh Balls. I find de 29 a little more bubbly than the 30:

29
Pentacon Electric 29mm F2.9 by The lens profile, on Flickr

30
Pentacon 30mm F3.5 by The lens profile, on Flickr

[Gerald]

[D1N0]

sure enough 95% of 30.5 is 28.975mm so they couldn't make it 28. There is a Meyer Optik predcessor to this lens. The Meyer-Optik Görlitz Orestegon 29mm/F2.8

Also it was marketed under the Carl Zeiss Jena brand: http://slrlensreview.com/web/reviews/carl-zeiss-lenses-swhorizontalmenu-172/zeiss-wide-angle/397-carl-zeiss-jena-29mm-f28-m42-lens-review

and there is this: https://www.bhphotovideo.com/c/product/1352322-REG/holga_317120_lens_for_samsung_nx.html if you want to call it a lens.

[Gerald]

[D1N0]

Field of view.

First 30/3.5 then 29/2.8 Both at F8 and focussed at infinity (the 30/3.5 overshoots infinity on my copy so I focus in live view at full magnification)



As you can see the 29 (unsurprisingly) has a wider FOV than the 30. So if it is 30.5 then the 30/3.5 must be even longer like 32.

I measured the horizontal FOV with Google maps. The 29 is about 135 meters the 30 is about 125 meters. The distance to the houses about a 100 meters but if i calculate the FOV for 29mm should be 124meters. Not so sure about the accuracy of google maps or I got the subject distance wrong.

https://www.pointsinfocus.com/tools/depth-of-field-and-equivalent-lens-calculator/#{%22c%22:[{%22f%22:13,%22av%22:%228%22,%22fl%22:29,%22d%22:100000,%22cm%22:%220%22}],%22m%22:1}

[paul49er]

[heritagecameras]