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Architeuthis

Member Since 05 Dec 2016
Offline Last Active Today, 10:52 PM
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Topics I've Started

Which wet wide angle lens for G7X MII?

03 January 2019 - 07:09 AM

A friend of mine asked my which WA adapter to acquire for his Canon Powershot G7X II. He has it in a D&D housing that has a M67 thread.

 

I am not familiar with the compact systems - could people with this camera please recommend which lens is optimal with respect to optical quality as well as to budget (I think Nauticam's WWL-1 too expensive for his plans)?

 

Eager to see suggestions...

 

 

Thanks, Wolfgang


PT-EP10 for Olympus EP-L5/6

22 December 2018 - 04:32 AM

I have a used PT-EP10 original Olympus housing for Olympus EP-L5 (or EP-L6), since I upgraded to Nauticam EM1II (my wife gets now my NA-EM5II and we do not have use for the PT-EP10 any more)...

 

asking 125 Euro (inclusive tray and handels) plus shipping

 

Wolfgang


Canon 8-15, 140mm minidome and OMD-EM5II

12 October 2018 - 01:11 AM

I used this combination during my last diving vacation in August/September in Croatia and it will not remain the last time that I used this combination...

 

Part I.:

 

Camera: OMD-EM5II, Metabones 1x adapter & Canon 8-15mm fisheye (FE). 2x Sea&Sea Y-DS2.

 

Housing: NA-EM5II, 34.8mm N85-N120 adapter, 35mm N120 extension and Nauticam 140mm N120 minidome. Zoomgear was from Nauticam, but with additional selfconstructed 3D-printed extension collar (the 34.8mm adapter was built for using the 0.71x Metabones speedbooster that is 5.6mm shorter than the 1x adapter, so the zoomgear requires extension).

 

Background: The Canon 8-15mm FE provides diagonal angles of view (DAVs) from 170o-85o on MFT sensors (calculated, actual DAVs may be slightly different (e.g. 180o @8mm)). For comparison, the rectilinear Pana 7-14mm provides DAVs from 114o-75o (this used to be my most used WA lens, but is practically unused UW since I have the Canon 8-15mm). The Canon hence covers the range from “real” fisheye (180o) up to the range of extreme WA. In addition, corner sharpness and “rectilinear distortion” at wide angles (e.g. @7mm) at the rim of the image, are expected to be much better with the FE (at comparable DAV).

 

Sample images (reduced to 250 kB maximum - so real IQ is better):

 

ISO 1250; @8mm; f: 6.3; 1/25s

Attached File  cave1_#2.jpg   224.01KB   16 downloads

 

 

ISO 200; @8mm; f: 11; 1/250s

Attached File  Boot1_#1.jpg   195.03KB   18 downloads

 

ISO 200; @8mm; f: 9; 1/250s

 

Attached File  FaBa1_#1.jpg   299.45KB   17 downloads

 

ISO 200; @8mm; f: 9; 1/250s

Attached File  Diver1_#1.jpg   159.4KB   17 downloads


Tokina 10-17mm with Nauticam Zoomgear

30 September 2018 - 01:05 AM

I do not have use for this lens, but it does not deserve to become a bench keeper (I use now the Canon 8-15mm fisheye)...

 

Tokina 10-17mm fisheye (AT-X 107 DX; Canon EF mount). New: 510 Euro (asking 250 Euros)

Nauticam TC 1017-Z Zoomgear                                            New: 168 Euro (asking 100 Euros)

 

 

sample images of the lens can be seen here: https://www.dpreview.../thread/4299636

 

package price: 335 Euros

(I include also the white zoomgear extension for MFT shooters (photo): with this extension collar the lens can be used with 1x Metabones adapter in any Nauticam housing for MFT cameras (I used it few times in NA-EM5II as described here: http://wetpixel.com/...560#entry397773))

 

Payment by direct bank transfer or PayPal. Shipping at the expense of the buyer.

 

Attached File  _9300044.jpg   477.57KB   25 downloads


Canon 8-15mm and Tokina 10-17mm on OM-D EM5II

25 July 2018 - 10:14 AM

Fisheye lenses available for MFT cameras are 8mm prime lenses (e.g. the Zuiko 8mm Pro FE), have 180o diagonal angle of view and give very good image quality. Upon close approach, however, one may wish to have a zoom lens that allows to reduce the diagonal angle of view and greater object distances. With the  Canon 8-15mm and the Tokina 10-17mm such lenses are available with Canon EF mount that can be used with appropriate adapters on MFT cameras.

 

First a size comparison of both lenses with the Zuiko 8mm Pro prime fisheye:

 

Attached File  le.jpg   91.99KB   19 downloads

From left to right: Zuiko 8mm 1.8 Pro fisheye, Tokina 10-17mm 3.5-4.5 with Metabones 0.71x speedbooster and Canon 8-15mm 4.0 with Metabones 1x smart adapter.

 

It is obvious that the idea of smart little equipment is of course best realized by the native zuiko lens, but on the other hand good quality wideangle ports and wet lenses are also voluminous. In addition an may have the impression that both lenses were designed for use on the MFT 2x crop sensor, the Canon with 1x adapter offering diagonal angles of view between 170o - 85o, starting with a diagonal angle of view similar to the Zuiko at the shortest focal length of 8mm and reaching into the domain of rectilinear WA lenses @15mm (same angle of view as a 12mm rectilinear lens). In comparison with a Full Frame camera, the type of camera the Canon 8-15mm has been designed for, the Zoom allows to switch from circular fisheye to diagonal fisheye, the range inbetween remains practically unusable...

 

On the last diving vacation in July (9 days in Croatia), I had the chance to test out both Canon and Tokina with the Metabones 1x smart adapter and also with the 0.71x speedbooster. I was using the EM5MII in Nauticam housing, Nauticam n85 to n120 34.7mm port adaptor, Zen DP-170-N120, 30mm (Canon) or 20mm (Tokina) extensions and two Sea&Sea YS-D2 flashes. When using the 1x metabones adapter, I had to use self made extension collars for the original Nauticam zoom gears for both lenses, since the 1x Metabones adapter is 5.625 mm longer than the 0.71x speedbooster. In this case the port extension was also 5.625 mm shorter as the one recommended by Zen for the lenses, but I did not notice a degradation in image quality. Here come some sample fotos of the same object framed at different dives (the fork-beard was so nice to be several times at the same location).

 

 

Tokina 10-17mm with 0.71x @ 8mm, f 8, 1/200, ISO200:

Attached File  Tokina_1.jpg   250.77KB   18 downloads

 

Canon 8-15mm 0.71x @ 11mm, f 8, 1/160, ISO200:

Attached File  Canon_2.jpg   204.88KB   20 downloads

 

Canon 8-15mm 1x @ 8mm, f 8, 1/200, ISO200:

Attached File  Canon_1.jpg   226.13KB   19 downloads

 

 

My first conclusions:

 

#1.: I like the image quality that exerted on this first trip. Especially at angles of view approaching the rectilinear WA range, corner sharpness is considerably better compared to the Pana 7-14mm in the same dome. In addition I personaly dislike the "corner-distortion" with rectilinear lens, e.g. Pana 7-14mm @7mm ("eggheads" of divers) and prefer the fisheye look.

 

#2.: Interesting enough the Tokina performed o.k. underwater, completely different to a dissapointing test on the surface, where the image quality was really poor (I was close to give away the Tokina):

https://www.dpreview.../thread/4299636

 

#3.: I have the impression that the Canon 8-15mm is a little bit sharper, when watching the images at my screen (but maybe this is homeopathic impression).

 

#4.: More dives, especially in clearer water, are required to decide whether (i) the Zoom lenses @8mm are as sharp as the Zuiko 8mm prime in the center and (ii) compare the sharpness in the center @ narrower angles with the rectilinear WA, e.g. Pana 7-14mm. I have, however, the impression that the fisheye zoom lenses perform at least as good in the center...

 

#5.: The only drop of bitterness I can forsee is that the Zuiko 8mm and the Pana 7-14mm (that was so far my prefered WA lens) may well stay unused in the bag in the future...

 

 

In the following post I show some other sample images taken with these lenses on the same trip...