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40-150 PRO focus breathing?

Started Jul 8, 2015 | Questions thread
Guy Parsons
Guy Parsons Forum Pro • Posts: 40,000
Re: 40-150 PRO focus breathing?

SVPhotography wrote:

Almost all lenses with Internal Focus designs have focus breathing issues - just a matter of how much.

You will need to buy a parfocal lens design to avoid focus breathing. Those are high priced optics - usually only found in cinema lenses.

The focus breathing issue was mentioned in a review of Jan of 2015

http://www.photographyblog.com/reviews/olympus_m_zuiko_digital_ed_40_150mm_f_2_8_pro_review/

For me the term "focus breathing" is totally wrong.

The effect really is "focal length breathing" if "breathing" is needed in the expression.

Simply a matter of the focal length changing as the lens is focussed closer, it happens to varying degrees with internal focus designs.

I first met the effect in film days with the Nikon 105/2.8 macro lens where it is an effective 79mm lens when focused to 1:1 ratio macro.

So, it is best to do angle of view and comparative framing tests with the lens focused at infinity.

Regards...... Guy

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