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Infinity v close focus (lens on tubes)

 
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bt_photo



Joined: 06 Jun 2018
Posts: 2
Location: England

PostPosted: Wed Jun 06, 2018 2:58 pm    Post subject: Infinity v close focus (lens on tubes) Reply with quote

Hi folks.

Sorry if this has been posted somewhere before. I'm new here (hello ) and couldn't find anything.

When using a lens on extension tubes, does it make any difference to image quality where the lens is focused? (infinity, close focus, or in the middle) - if you are moving the camera to focus...

Thanks Smile
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rjlittlefield
Site Admin


Joined: 01 Aug 2006
Posts: 19408
Location: Richland, Washington State, USA

PostPosted: Thu Jun 07, 2018 12:31 am    Post subject: Reply with quote

Welcome aboard! Very Happy

The general rule is to drag any lens away from its design space as little as possible.

If you're extending the lens just a little, then the best bet is to turn the ring to its own closest focus, then add minimal extension behind it.

If you're adding lots of extension, taking the lens beyond 1:1, then probably it's better to reverse the lens and set the focus ring to whatever best matches the distance between lens and sensor.

The other general rule is that there are always exceptions. For critical work, be sure to run a real-world test.

--Rik
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bt_photo



Joined: 06 Jun 2018
Posts: 2
Location: England

PostPosted: Thu Jun 07, 2018 12:47 am    Post subject: Reply with quote

Hi Rik.

I've been using a focus rail for indoor still things, so the whole setup moves. Will try more experimenting today... :-)

Thanks,
Brian
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