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Tuesday, 18 March 2025

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Wrong happens Mike. No harm, no foul. The only thing worse is leaving it up when you know it's wrong.

There's no problem with admitting you're wrong when you receive new information and change your mind. "Think Again: The Power of Knowing What You Don't Know," by Adam Grant makes the point that whatever you think you know, don't be afraid to rethink it. Evidence has shown that creative geniuses are not attached to one identity, but constantly willing to rethink their stances. That notion is embodied in the scientific method where we test our knowledge to advance it. Grant says that if you find you're wrong about something you should rejoice because you're now closer to being correct.

Which brings us to the Dunning-Kruger Effect. Research shows that those who are the least knowledgeable in a subject tend to be the ones who overestimate their own knowledge and abilities, while those that are full of doubt know enough about the topic to better gauge the extent of their ignorance.

I wish I could just delete all the stuff I was wrong about! I think your solution here is a good one, even if it must be a bit painful.

Good on you Mike. Honesty is the heart of good communication.

Ricoh Imaging states: "Through intentional fine-tuning of the lens design", the smc Pentax 50mm f/1.4 lens "has been designed to produce a unique visual effect commonly known as rainbow flare when an image is captured at open aperture* and against strong backlight."

https://www.ricoh-imaging.co.jp/english/products/lens/k/standard/smcpentax-fa50-classic/

What, exactly, was the intentional fine-tuning of the lens design?

One might immediately suspect the designers made a slight change in the spacing of one of the seven elements. However, that can't be, because the MTF graphs of this smc Classic version are identical to those of the non-Classic HD Pentax 50mm f/1.4 version.

My best guess at present is that perhaps the intentional 'rainbow flare' of the new smc 50mm Classic lens is the result of deliberately not painting the edges of one or more of the lens elements.

That’s why the best lenses from Leica, Canon, Nikon and Sony are what they are. No gimmicks , just top quality glass. You get what you pay for.
Bill

On a related topic -- I read a quote yesterday that I found very interesting. "Most people hate to change their minds. But, I like to because I know I learned something."

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