Is my thinking about equivalence right?

Started 3 months ago | Questions thread
Mark Ransom
Mark Ransom Veteran Member • Posts: 7,669
Re: Is my thinking about equivalence right?

Muster Mark wrote:

Only if illumination is even, which it is not. Now, it gathers MORE light for sure, but what inspired this post was that vingetting affects total light to the degree that 4x turns into more like 2.8x depending on lenses being considered. This might seem like technical hairsplitting, but to dig into technicalities was the point of the post.

This is the first time I've heard anybody claim that FF is more prone to vignetting.  You say in the opening post that this is obvious, but it certainly isn't obvious to me.  If FF lenses were so bad it would be a bigger topic of conversation.

 Mark Ransom's gear list:Mark Ransom's gear list
Pentax K-7 Pentax K-01 Olympus E-M5 II Pentax smc DA 15mm F4 ED AL Limited Pentax smc DA 18-135mm F3.5-5.6ED AL [IF] DC WR +6 more
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