Playing around with depth of field and I think I finally get it?

Started 3 months ago | Discussions thread
LillyRoseAvalos
OP LillyRoseAvalos Forum Member • Posts: 67
Re: Playing around with depth of field and I think I finally get it?
1

I thought I would share some links to a couple interesting articles I have read today. I stumbled upon smooth trans focus lenses and defocus control lenses sadly even if you own a camera for the respective lens mounts so they are quite expensive

Adding a last article here. I found out someone has been able to emulate the effect of a smooth trans focus lens. Their findings are pretty interesting.

https://petapixel.com/2018/02/12/get-look-smooth-trans-focus-without-stf-lens/

This was a very useful review and test of the105mm f/2D AF DC-Nikkor it explains how defocus control works. Its also a crash course in depth of field!

https://www.stacken.kth.se/~maxz/defocuscontrol/

Now defocus control changes spherical aberration of the lens while smooth trans focus uses what they call an apodization filter.

Here is more information of how defocus control works.

https://photo.stackexchange.com/questions/7044/how-do-soft-focus-or-defocus-control-rings-work#:~:text=Defocus%20control%20is%20exactly%20what,by%20a%20slightly%20movable%20diaphragm.

Good article about apodization filters. The wikipedia page was over my head this explains it better.

https://photo.stackexchange.com/questions/54156/how-does-an-apodization-filter-improve-bokeh

Oh and here is an interesting review of a smooth trans focus lens it goes in depth about bokeh.

https://www.opticallimits.com/sonyalphaff/1016-sony100f28stf

I also found a dpreview article about this lens.

https://www.dpreview.com/news/2820818690/sony-fe-100mm-f2-8-stf-bokeh-demystified

Now according to wikipedia there was a camera made by minolta called the Minolta Maxxum 7 that could emulate smooth trans focus by doing multiple exposures using different apertures. According to Wikipedia this has not been done since in any camera.

I found this articles discussing the cameras emulation.

http://wkoopmans.ca/notebook/?p=22286

They sell these cameras for around 300 dollars on ebay. Sadly I cant find any sellers that will ship to Europe. Otherwise id probably pick one up just to try it out.

Lastly I read up on soft focus and frankly I'm still not sure what makes it different from bokeh. But I did discover that there is a lens legendary for its soft focus that was made in the 30s by Leitz apparently they released an updated version in 2017. Here is a review I found its pretty interesting.

https://www.overgaard.dk/the-story-behind-that-picture-0187_gb.html

The old version sells for about four thousand dollars on ebay and the 2017 version for about seven thousand.

 LillyRoseAvalos's gear list:LillyRoseAvalos's gear list
Panasonic Lumix DMC-FZ70 Panasonic FZ80/FZ82 Sony a6000 Panasonic Lumix DMC-GX85 Canon EOS M100 +1 more
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