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Lunar Eclipse PICS with the EOS Ra, EOS R6 & EOS M6

Started May 29, 2021 | Discussions thread
Thomas A Anderson Senior Member • Posts: 1,360
Re: To: Mr Anderson

Sittatunga wrote:

That lens came out in December 2008. The EOS 5Dii from a month earlier only offered peripheral illumination correction in camera. The 5Ds which came out seven years later added chromatic aberration correction but no distortion correction in camera. Relying on drastic automatic distortion correction only really came in with mirrorless camera lenses. Another thing is that a lens with a small enough image circle to give missing corners would look pretty horrible through a reflex viewfinder while you can correct that distortion automatically through an EVF. I think Marco's problem with that lens on the EOS Ra had a different cause.

Hmmmm….well don’t different wavelengths of light have different refractive indexes that would then require the Ra mod to reposition the sensor or adjust the lens focus differently?  Maybe the filter itself can’t handle the angle of incidence of incoming light and causes it to miss the microlenses?  Anyway, seems like there must be something about the Astro model if the lens is that old.  Either way, I’m sure he’ll figure it out.

 Thomas A Anderson's gear list:Thomas A Anderson's gear list
Canon EOS R
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