10 stop filter focus

Started Nov 19, 2012 | Questions thread
PhotoKaz
Regular MemberPosts: 316Gear list
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Re: 10 stop filter focus
In reply to primeshooter, Nov 20, 2012

primeshooter wrote:

PhotoKaz wrote:

primeshooter wrote:

jkjond wrote:

PhotoKaz wrote:

jkjond wrote:

primeshooter wrote:

Now I am aware of what is called focus shift due to spherical abberation when a lens is focused wide open. My question is, does it matter when I am stopping down to such tiny apertures? My results seem to be sharp most of the time at 100% on the subject which I am focusing. Unless the sand moves or something...

Your camera always focuses at max aperture then stops down to take the shot whether you have a filter mounted or not.

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UK wedding photographer in the Lake District
http://www.johnleech-weddingphotography.co.uk
For my landscapes and fine art photography:
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Not true, my camera focuses at the shooting aperture when in LV mode.

So it does - thanks, I didn't know that. It seems to be the perfect solution to the focus shift problem for macro shooters.

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UK wedding photographer in the Lake District
http://www.johnleech-weddingphotography.co.uk
For my landscapes and fine art photography:
http://www.johnleechstudio.co.uk

With this in mind, there should still be no issue with LV and focusing at f/2.8 through filter then stopping down though, right? It would never achieve focus at f/11 through a 10 stop even in the daylight.

There will still be a focus shift as you are not setting the focus at the same fstop as you are shooting at. Some lenses are worse than others, shooting with a high ftstop will mitigate the issue but may not eliminate it completely.

Hm, I will try and see if I can manual focus by adjusting the ISO etc and leaving the aperture where I want it but not sure if that will work. Sometimes I am focusing at infinity so that is easy, other time's a 1/3 in, and other times on an actual specific subject in the scene - this is when I need to be able to focus through the 10 stop, or I guess I could just take it off for these instances to make sure I get no shift in focus from stopping down.

Taking it off to focus is the only sure way to make it work.  Drop in filters using mounting kits like Lee or Conkin are much easier for this.

 PhotoKaz's gear list:PhotoKaz's gear list
Nikon D800 Nikon AF-S Nikkor 14-24mm f/2.8G ED Nikon AF-S Nikkor 24-70mm f/2.8G ED Nikon AF-S Micro-Nikkor 105mm f/2.8G IF-ED VR Nikon AF-Nikkor 80-200mm f/2.8D ED +1 more
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