Sony 11mm f/1.8 G

FYI - I asked Nauticam about the 10-20 and here is the response I got (I checked that it was okay to repost):

Quote

Thanks for reaching out! We have tested this lens in house, and actually made a gear. It didn't make our port charts due to a few issues with the port configurations available.

There is vignetting in the extreme corners at 10mm. This actually goes away shooting in JPEG due to the barrel distortion correction in camera, or can be corrected in lightroom via a crop or lens correction.

The following are compatible if this vignette is acceptable:

1. 36133 N85 6'' acrylic dome port
2. 36207 N85-N120 50mm Port Adaptor II + 18809 180mm optical glass wide angle port

The zoom gear is available here:
https://www.nauticam.com/products/se1020-z-zoom-gear-for-sony-e-10-20mm-f-4-pz-g-len

Regards,

- brett

Thanks - that's helpful. Since the 36133 is mentioned as an option, that confirms the zoom gear is operated by the housing knob and gear (since the 36133 has no knob).

And (hopefully) the camera with lens and zoom gear fitted will be able to slip out the back of the housing through the N85 components, without removing the port. If anyone can confirm this, that would be fantastic!

Regarding the "vignetting" (I assume they mean corner cut off), a fisheye port will solve that, although a shorter N85 to N120 adapter would be required if using a N120 fisheye port, for best alignment. There are some issues going that way, so I'm sure they didn't test that option; but nothing that can't be solved. Plus I already have all the bits and am not about to buy the expensive and heavy 180mm glass port.

All in the quest for 'one port to rule them all' (for easy travel and tough dive conditions with my little Sony system).

Must be something odd with the entrance pupil location with the lens, the 180mm dome is a large enough section to accommodate a 16mm equivalent lens with entrance pupil at the centre of curvature. 

On fitting through the N85 port the limiting factor is the bolt on lug ring with many of the Nauticam domes, The zoom ring of my Oly 12-40 lens won't go through any of the ports I have, it only fits through the Zen 170mm port which has the lug ring machined into the port barrel so has a bigger ID.

Do you have the 10-20 in hand?  On my Oly lens which is very similar size the Zoom ring is ~70 mm diameter and the Zoom gear OD is ~75mm.  I would think the OD of any Nauticam zoom gear with type of construction would be very close to 5mm larger than the zoom ring on the lens OD.  Might be enough to say it will not fit - but a bit risky till you get the whole assembly in hand to say that it will.

The ID of my ZEN 170mm port is 77mm - this is as big as it is possible to make an N85 port.  The 12-40 with 75mm zoom ring just.... fits through from the back.  By comparison my flat ports from Nauticam are 70mm OD.  What is the ID of your 36125 port?

Hmmm it's going to be touch and go. I have the lens to hand and listed dia is 69.8 which would be for manual focus ring right at the front (widest bit). Zoom ring appears to be approx 4mm smaller... but I don't have a big caliper to measure properly.

Most of my dive gear and housing is 1000 km away and I'm not allowed to travel atm, but the 50mm N85 to N120 adapter I do have handy is approx 76mm ID (lugs machined into it).

36125 was 69.5mm and is now enlarged to approx 70mm (to fit Samyang AF 12 which I sold).

To summarise, prob 10-20 won't fit with zoom gear att through 36125, but should (just) fit through the 34.7mm N85 to N120 adapter (assuming its ID is same as 50mm adapter) which I want to use (with 140 fisheye dome)!

I can try the 50mm adapter with the 140, but that puts the dome approx 12mm too far forward, which may also cause cutoff. Who knows...

Busting to try it but sadly now prob 3 months off...

Zoom ring measures between 68 and 68.5 mm. Focus ring measurement check is 70. My workshop is analagous to backyard in Mumbai (no offence intended).

2 hours ago, dentrock said:

Hmmm it's going to be touch and go. I have the lens to hand and listed dia is 69.8 which would be for manual focus ring right at the front (widest bit). Zoom ring appears to be approx 4mm smaller... but I don't have a big caliper to measure properly.

Most of my dive gear and housing is 1000 km away and I'm not allowed to travel atm, but the 50mm N85 to N120 adapter I do have handy is approx 76mm ID (lugs machined into it).

36125 was 69.5mm and is now enlarged to approx 70mm (to fit Samyang AF 12 which I sold).

To summarise, prob 10-20 won't fit with zoom gear att through 36125, but should (just) fit through the 34.7mm N85 to N120 adapter (assuming its ID is same as 50mm adapter) which I want to use (with 140 fisheye dome)!

I can try the 50mm adapter with the 140, but that puts the dome approx 12mm too far forward, which may also cause cutoff. Who knows...

Busting to try it but sadly now prob 3 months off...

need to be looking at the zoom ring because when you add the gear to it, it is the limiting diameter.  The adapter sounds the same as the Zen dome and the 12-40 fits through that and it sounds like the 10-20 you have is extremely close in size.  The N85 extension rings with locks however do not fit, if you needed more extension it would have to be an N120 ring.

Measure the zoom ring by placing it inside the adapter, touching on one side and measure the gap and get your diameter by difference.  Then of course there is the assumption that the diameter increase is the same.

I expect you could have the dome forward a bit as the angle of view is 94° on the diagonal, gut feel without doing the calculations is it should be OK and the dome shade is designed for a fisheye so should also be fine.  All you have to do is have it fit.

Thanks Chris. I confirmed lens zoom ring dia at between 68 and 68.5mm so should fit through adapter as you suggest, allowing for 5mm extra thickness. Btw FOV for this lens at 10mm is 109 degrees. Won't need more extension as it aligns within 3mm with 34.7mm adapter - would need 12mm less if using the 50mm adapter.

Off topic, but as a serious Ollie user, are you getting the new 90 macro? Sounds fab, esp if combined with OM1 with its big EVF and fast AF.

If you are, can you please post a mini review in due course?

19 minutes ago, dentrock said:

Thanks Chris. I confirmed lens zoom ring dia at between 68 and 68.5mm so should fit through adapter as you suggest, allowing for 5mm extra thickness. Btw FOV for this lens at 10mm is 109 degrees. Won't need more extension as it aligns within 3mm with 34.7mm adapter - would need 12mm less if using the 50mm adapter.

Off topic, but as a serious Ollie user, are you getting the new 90 macro? Sounds fab, esp if combined with OM1 with its big EVF and fast AF.

If you are, can you please post a mini review in due course?

I'm planning on buying one, mainly for land based work, not too sure about taking it UW yet, we'll see what Nauticam comes up with in the way of ports - it should just fit in the flat ports without a focus gear.  For the immediate future It would have to mate with my EM-II have not bought a housing for my OM-1 yet.