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Canon EF lenses on MFT cameras?


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#1 Architeuthis

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Posted 26 February 2018 - 01:33 AM

Nauticam has now a N85-N120 adapter in the program that allows to use the Metabones x0,71 speedbooster (http://www.metabones...MB_SPEF-M43-BT4).

 

 

https://www.nauticam...ter-ultra-0-71x

 

The speedbooster allows to use Canon-EF mount lenses, as the Canon 8-15mm fisheye or the Tokina 10-17mm fisheye, on MFT cameras and with the adapter these lenses can now be used on any Nauticam N85 housing.

 

 

Wolfgang

 



#2 Atobit

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Posted 26 February 2018 - 06:02 AM

Good news Wolfgang, thought not sure what would I need, I think there are already very good M43 lenses.
 
Oh yes I know...for the fun I would take the Canon EF-S 60mm macro to adapt the UFL-MR130, the Inon micro Semifisheye Relay lens I have.

 

X-2_50D_40D_with_UFL-MR130_EFS60.jpg

 

Claude



#3 thetrickster

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Posted 26 February 2018 - 11:24 AM

Wow,

 

Thats pretty interesting, one option I've never considered, great to see Nauticam supporting this.

 

There must be some lovely EF mount glass for underwater use... and it opens up the possibility of using the new WACP!!!!!!!!

 

But I do feel we are spoiled a little with the vast selection of Olympus and Lumix glass already available, so would have to be something special to warrant the costs involved.


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Camera Rig: Nauticam Lumix GH5/GH5s, 14-42mm II, WWL-1, Atomos Inferno, 48,000lm of artificial sun.

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#4 bubffm

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Posted 26 February 2018 - 12:29 PM

thats interesting indeed. But the Metabones has its downsides and does not work with all lenses equally well. I used to use it overland but have actally now sold all my Canon/EF Glas as there are so many great native lens options around for MFT.

And they save a lot of weight....

#5 Architeuthis

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Posted 27 February 2018 - 03:35 AM

I also think there are plenty of native high quality lenses for MFT available for UW use...

The exceptions I can think of are fisheye zoom lenses, true circular fisheye (and the fancy macro FE adapter that Atobit shows above).

 

I personally am very interested in using a FE zoom lens UW and was already doing recherces and comparisons. In the Nauticam chard on Sony E-mount (A6xxx), the Metabones adapter is already listed as beeing compatible with the 50mm N85-N120 extension on A6xxx housing. I wrote to Nautican, whether the Metabones adapter would fit into my 60mm N85-N120 extension an NA-EM5II housing and they wrote me that they have now the special adapter. Alex Tattersal from Nauticam U.K. wrote also, regarding my 60mm N85-N120 extension: “No, this won't work, you won't be able to zoom. The cog for the Tokina zoom needs to mesh with the gear on the adapter. No manual focus either.“

=> bubffm, did you try FE or WA lenses with the adapter and how is performance (focus speed etc...)?

=> I am also wondering whether someone did try the combination Metabones/FE zoom UW (maybe the performance is so bad that nobody uses this combination)?

 

According to the data I could find in internet, the Tokina migth perform better than the Canon Zoom fisheye, as the resolution of the FF lens suffers on the small sensor and in addition there is a lot of light eaten up, the Tokina gains even some light with the x0,71 at comparable resolutions (calculations for x1 adapter and x0,71 speed booster; resolution data may be not very accurate as measured at different Mpix sensors and from Zuiko 8mm FE data were estimated indirectly from a photozine diagram). As always, it seems the performance of the prime lens (Zuiko) is superior, but the two zoom lenses are not far behind:

Unbenannt-2.jpg
 

Wolfgang :)


Edited by Architeuthis, 27 February 2018 - 03:50 AM.


#6 bubffm

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Posted 27 February 2018 - 05:13 AM

Wolfgang, never tried FE but I owned the Canon 16-35 Version III. And that was actually one of those that did not work particulary well with Metabones. AF issues and also the occasional bug changing aperture. I had to unplug and replug the Adapter to get it working. Something that would be a bit hard to do underwater....

Maybe fixed by now but I still dont see that lens on Metabones compatability list.... which gets me back to my point above...

#7 Architeuthis

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Posted 27 February 2018 - 06:08 AM

Thanks bubffm!



#8 dreifish

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Posted 15 March 2018 - 08:54 PM

I've used the Canon 8-15 + metabones adapter (not speedbooster) with the A7RII and that worked fine. Not sure if it will work equally well with their EF-m43 speedbooster, but I suspect it will.

I'm quite interested in adapting the lens to my new GH5 setup, but no need for a speedbooster really.. a plain adapter would work just fine given the focal range -- taking you from 170* fisheye to something like 100 degrees almost rectilinear at the 15mm end. But need to find a electronic (non-speedbooster) adapter from EF-m43, and need to check if it's sufficiently long to still allows the zoom gear to work with this new nauticam port adapter.

 

Also interesting might be the new Viltrox EF-M2 .71x adapter as an alternative to the metabones. It's around $200 instead of $600...



#9 Architeuthis

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Posted 16 March 2018 - 01:07 AM

Hi dreifish,

 

I have decided already, since I was able to get the Tokina 10-17mm second hand from ebay. I have the Metabones MB_SPEF-M43-BT4 already here and am waiting for the lens, which is on the way (it is the version with integrated hood, so there may be some vignetting at 10mm, but it was a real bargain...). I would not have decided for a cheaper booster, since I read in the internet that some cheaper versions have bad optical quality and/or incompatibility issues (some even damage the sensor, people say).

When the lens is here I will check whether I can solve the problem of zooming with the 60mm or 30mm N85-N120 adapters that I have here. If not, I will go for the 34,7mm adaptor mentioned above with 20mm extension and Nauticam zoom gear...

The rigth adapter for the Canon 8-15mm FE should be the Metabones MB_EF-m43-BT2 (this is the one without the optics). This adapter is also perfect for the Sigma 4,5mm circular FE (also possible with the booster, but then the circle projects on a smaller part of the sensor only, wasting more pixels...).

 

=> It seems that the MB_EF-m43-BT2 will fit into the 34,7mm N85-N120, but better to ask Nauticam before (Maybe using the 34,7mm extension is only possible with Metabones adpaters, since other adapetrs may have different dimensions)...

 

Will be very interesting to compare the images obtained with the different solutions - I will report, but it may take several weeks until I am so far...

 

Wolfgang


Edited by Architeuthis, 16 March 2018 - 02:07 AM.


#10 Architeuthis

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Posted 23 March 2018 - 09:25 AM

Just an update on the Canon EF lens on MTF tread, in case someone is interested:

 

I have now the Tokina 10-17mm fisheye zoom and the Metabones adapter here. It turned out it is not possible (or very difficult al least) to make a Zoomgear for the existing N85-N120 60mm adapter. So I had to order the special 34,7mm adapter, 20mm extension and Nauticam zoom gear.

 

In the meantime I made a over-water comparison of the Tokina with the Zuiko 8mm Pro fisheye that I have here:

https://www.dpreview.../thread/4267346

 

The results show that the optics of Tokina plus Metabones is inferior to the native MTF lens. I hope that the performance difference between Tokina and Zuiko UW, behind a domeport, will become much smaller...

 

 

Wolfgang



#11 dreifish

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Posted 24 March 2018 - 09:08 AM

What are you basing your resolution figures on, Wolfgang?

 

Interestingly, in terms of field of view, the 10-17 with a 1x adapter ends up having a very similar FOV coerage to the 14-42 + WWL-1 combination. 



#12 Architeuthis

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Posted 24 March 2018 - 12:47 PM

The resolution data in the table are not much more than a first guess (sorry, dreifish, for not stating this so far): the resolution of the opticallimits-tests (linewith/picture heigth) scaled to the size of the MFT sensor. So when a FF lens is used on MFT the resolution drops to approx 50%, since the picture heigth is approx. only half. With the speed booster the resolution should be better, as a larger area of the original sensor is projected on the MFT sensor (this was also taken into account for the calculated resolution). This calculations are problematic, since even with the same sensor size the data are different with different sensors (e.g. Mpixels) and it is even more problematic to compare different sensors sizes so directly.

But since this was the only data I found on that issue, I thought it may be good to have at least this estimate...

The resolution data for the Zuiko 8mm are even more problematic, as I could find only a test, where the numbers where not given, but read the approx. values out from the graph (that was obviously produced by the same method and even software as in the optical limits tests).

 

=> At least for the comparison Zuiko 8mm vs. Tokina/0,71x speedbooster, however, it turns out that this estimation was not so wrong (if you have a look at the dpreview link above). The real live comparison is clearly in favour of the Zuiko, the difference probably substantially bigger as in the table, Tokina really looks old...

=> This is discouraging, but this all is valid for photography above the surface only. Let us see how the Tokina/Booster combo works behind a dome (I will be able in few weeks to test it behind the Zen DP-170 and compare to the Zuiko 8mm that I use behind the same dome - In case the Tokina/booster combo performs equally bad as on the surface in comparison, I fear I will not use it so often...).

 

Wolfgang


Edited by Architeuthis, 24 March 2018 - 12:49 PM.