Where have all the Focal-reducers gone? (with apologies)

Started 8 months ago | Discussions thread
Tom Caldwell
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Re: speaking of blue dots...
In reply to greypixelz, 8 months ago

greypixelz wrote:

Hi Tom,

I bought a second focal reducer, this time the RJ variety, for EOS mount. The first one I got was the Mitakon for Nikon F mount.

I thought the blue dot would be less visible on this second adapter, however, it seems to be slightly worse.

Thanks for your addition to the knowledge pool, I presume that it was the same lens set?  I recollect others complaining about the RJ and Nikon lenses specifically.  If the blue dots appear on both adapters it may indicate a similar lens element configuration but also highlight that Nikon company was not over-concerned with ghost reflections off film stock when the lenses were first made.  Presumably the reflections off film were so inconsequential the the Nikon designers either did not notice them or decided to ignore them.

I am more into Takumars on M42 and if there are any blue dot ghost reflections in there I have not been clever enough to notice them.. but I did force a blue smudge once when I set out to find it.

Occasionally I can get offset flares, some of them blue, but I regard them as normal bright-sun true lens flare and not the more centre of lens blue spot or smudge.

If the RJ was better at pulling out the "deficiency" in the Nikon lenses then, as focal reducers are supposed to amplify everything including lens faults, we might in a round about way give some grudging respect for it amplifying the ghost sensor re-reflection from inside the Nikon lens.  A sort of obscure back to front compliment.

I'm surely staying with APS-C, at least for the foreseeable future. Photography is a hobby I don't have enough time for, so spending that amount on new gear is out of the question for me.

Looking forward to your focal reducer related insights.

Cheers!

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Tom Caldwell

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