For about the same price..RF 70-200mm F/4 or EF 70-200mm 2.8 IS iii ?

Started 6 months ago | Questions thread
tkbslc Forum Pro • Posts: 17,224
Not been an issue

Paysen wrote:

To me the EF 70-200 2.8 has a big advantage: Internal zoom and internal focus. It is less likely that you get dust or moisture inside of the EF lens imo. The lens is sucking air inside of it when the front element extends because extending the lens increases the internal volume of the lens. This can cause dust and moisture to be pulled into the lens when zooming in and out.

That is all theoretical.  In the real world,  every standard zoom and every zoom longer than 200mm has always had an extending design.  They are not all full of dust and fungus.  Take 70-300L and 100-400 II for example.  Both have been around for years.

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