What is the effect of putting a rear 1.4X converter behind a Macro lens?

Started Jul 21, 2014 | Discussions thread
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Petroglyph
Petroglyph Senior Member • Posts: 5,091
What is the effect of putting a rear 1.4X converter behind a Macro lens?

Let's say I put the Pentax 1.4X AW TC behind Pentax 100mm Macro lens - then shoot some macro.

Does it change the Max reproduction ratio from 1:1 to 1,4:1 ?

Does it change the min focus distance?

Does it change the Max aperture?  Guess to f/4.  What about at close focus distance?

Does it change the working distance?  Compress the focus throw length?

Increase/Decrease DOF?

Note: I have neither the converter nor that particular macro so it is an academic question.

Cheers.

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