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I finally got around testing the various adapters I bought to adapt my Carl Zeiss Contax Yashica primes to our RED. The RED has the Wicked Circuit dumb mount. All adapters work fine up to about 20 meters, but after that there is a definite difference.

All tests were done on the Zeiss 50/1.4 lens, with the aperture set to 4 and 16. No filters were used, instead faster shutter speeds were employed.

Here is the frame I took in 4k, scaled down to 25% (Click on picture for full size), further down the test you will see 100% cropped images of just the chimney (compressed to jpg in Photoshop with high quality setting) .

El Cheapo

First in line is the £5 adapter off eBay from seller big_is. Very quick and efficient delivery from Hong Kong. Fits nicely. Fairly soft on infinity.

Holds fairly well at f16.

Bad at 4.

Conclusion: if you are on a budget, and either only shoot closer subjects or have plenty of light, this is an acceptable adapter.

DVD Technik

Next in line is the adapter from DVD Technik in the Ukraine at about $35. Has a very nice quality feel to it, and sist very tight on the lens. Best to be fitted once onto the lens, and left in place. Also quite tight once connected to the camera; downside is that it takes a bit longer to change lenses, but they do sit more tightly.

Disappointing at f16.

Appaling at f4.

Conclusion: Not really an option.

Confirm Adapter

Fianally the most expensive option at $85 from Happypage in Hongkong, an adapter with built-in autofocus confirm chip. Happypage offers the option of getting that chip programmed to your specific lens, which is a nice option when you want to use your lenses on a Canon EOS stills camera. Since the RED is thankfully a fully manual camera, I could not test this extra functionality.

At first the adapter would not fit. After an e-mail to happypage they immedeatly sent off a second adapter without any cost to me. The adapter arrived, but would not fit either. This suggests that the Wicked Circuit adapter might be slightly off, since happypage has only happy curstomers. Anyway, using my Dremel drill, I managed to get the adapter to fit into the RED – again, very tight, but not as tight as the DVD Technik one, and run the tests.

Happypage advertizes the fact that their adapters are a fraction of a millimitre thinner than their competitors, and claims that this helps with the focus on infinity. Let’s see how this holds up to reality.

Me likes at f16.

A Bit disappointing at f4.

Conclusion: Clearly the winner.

Conclusion

As so often, if you want quality, you have to pay for it. Interesting though that the by far cheapest option was not the by far worst one.

Also it seems that I still have problems with the back-focus on the Wicked Circuit adapter. My guess is that if that should ever get sorted out (or I might – gasp – order again a Birger Canon mount) the results will improve.