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Member Since 09 Feb 2007
Offline Last Active Today, 03:20 AM

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In Topic: Nikon 8-15mm in the house!

22 June 2017 - 03:06 PM

Hi all,




And were made with the idea that if someone is thinking they might want to buy a D500 to get the "wider" zoom range of 180 degrees to 110 degrees that this lens provides on a DX camera, which is similar to the Tokina 10-17mm lens, that they could get the same zoom range by switching their FX camera to the DX crop mode and lose very little in comparison to a DX only camera.


I would disagree on the point of "losing very little" between D800/D810 in FX mode and the D500. This is of course based on shooting all three cameras underwater a fair bit now! However, that is a discussion that we are best having somewhere else. 


I would absolutely agree that there will be no vignetting or port shade in the image with the D800/D810 and this lens at 15mm. Equally I would tend to agree that the optical quality on this lens is much superior to that of the Tokina 10-17mm. This is especially true if the Tokina is combined with a TC on an high resolution FX camera like the D810. Build quality seems also to be in a different league. Most of us have had at least one Tokina come apart on us!


Strictly technically, the Sigma does actually focus closer than this lens (by 1cm). I note that Nikon list the FOV of the lens at 175° at 15mm on FX. The Sigma has an FOV of 180°. That 5° difference in FOV probably explains the lack of vignette.


The D810 images above were with a Seacam Compact port (170mm). I have used the Sigma with this port a lot and there is no vignette at any aperture. It is amazing to think that 10mm of difference in diameter produces such a difference. It is a salutory tale for anyone considering dome port choices.



In Topic: Nikon 8-15mm in the house!

20 June 2017 - 09:42 PM

Hi Fred-thanks for your thoughts on the D810 vs D500. Can we try to keep the thread focused on the lens though? Did you get the lens shade in the frame at 8mm in FX mode with the 20mm extension?

In Topic: Nikon 8-15mm in the house!

20 June 2017 - 02:34 PM

I don't think so Bill,


I think it is "seeing" the sunshade...


If anything, it might be too far into the port. I will try it with an extension in the pool on the weekend...



In Topic: Nikon 8-15mm in the house!

20 June 2017 - 02:04 PM

Lovely image Fred...


Here is a series of images taken with the D500 and D810 today. I have deliberately not edited them; they have been run through Lightroom with no adjustments or presets.


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Set up was as follows:




Seacam housing

Seacam Compact Port

No extension


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The lens deals with the sunball well


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Completely unadjusted in post. Camera and lens tonal range is very good!




Seacam housing

Seacam Fisheye Port

No extension

2 x Seacam Seaflash 150 strobes


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Shooting straight up into Snell's window. Lens copes with sunball?


I shot quite a few more images, including a variety of apertures. I will post these in the full Wetpixel lens review to follow soon.


First impressions are that the lens is optically very good, better than the Tokina 10-17mm and on a par with the Canon EF 8-15mm f/4L.


Usable range on FX will be based on having a dome with a removable sunshade. This will be needed from 8mm through to around 13mm. 


On DX, the lens partially vignettes at 8 and 9mm, before offering usable image from 10 through to 15mm.


Pool testing on Sunday....










In Topic: Nikon 8-15mm in the house!

19 June 2017 - 12:42 PM

Some good news is that on my (Seacam) set up, the zoom ring for the Nikon 10-24mm works beautifully with this lens!


I'll be shooting it tomorrow with a Fisheye (4") port on the D500 and a Compact (7") port on the D810.




it would be nice to know the nodal point


Is there any specific way of calculating this, or is to just trial and error?