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Nikon Mirrorless cameras - Z6 and Z7

Nikon Mirrorless Z6 Z7

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#21 guyharrisonphoto

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Posted 11 September 2018 - 07:19 AM

I have cancelled my pre-order for now.  It seems the AF on these is not up to the D850 and D500 in terms of speed or AF tracking.  Since I am beginning to do blackwater photography, AF and CAF tracking is an absolute key aspect of the camera and not something I want to compromise on.  I am still reluctant to go to the huge housings for the D850 and D500.  So, I will be waiting to see new developments later this year from Sony.



#22 Undertow

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Posted 12 September 2018 - 07:31 AM

I have cancelled my pre-order for now.  It seems the AF on these is not up to the D850 and D500 in terms of speed or AF tracking.  Since I am beginning to do blackwater photography, AF and CAF tracking is an absolute key aspect of the camera and not something I want to compromise on.  I am still reluctant to go to the huge housings for the D850 and D500.  So, I will be waiting to see new developments later this year from Sony.

 

Sensor-based AF can't compare to a dedicated AF module (requiring a mirror). It's certainly come a long way but still a far cry for the foreseeable future. I guarantee you Sony won't suddenly revolutionize sensor AF later this year. 



#23 guyharrisonphoto

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Posted 14 September 2018 - 07:33 AM

You might be right, but then I will settle for the best that mirrorless can offer.  For now, that seems to be the A9 but Sony is rumored to have an APS-C camera coming with the same or better focusing.  That might be the best compromise in terms of size and performance. Also, don't know what the new Canon is capable of yet.  Seems like a good time to wait for a couple of months before deciding anything.



#24 Tom_Kline

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Posted 14 September 2018 - 04:52 PM

I suspect we will soon see mirrorless/live view AF out-performing conventional AF. Already it is more accurate. As well, there is greater coverage across the format for full frame, more sophisticated AF, and more AF points. These are probably inter-related. Faster CPUs probably help here. We will probably will see dedicated CPUs for focusing in upcoming pro models, maybe even the replacements for the D5 and 1Dx2, to speed things up even further.

 

A big limitation in the past has been viewing - hard to see the back screen in daylight among other issues. EVF to the rescue. Lag seems to be a non-issue now and resolution is excellent based on what I hear (will see as I have a Z6 on order).

 

Low light ability may soon or already have exceed what conventional AF can as well.


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#25 eikojnz

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Posted 22 September 2018 - 07:20 PM

From what I have been reading there are three issues that would prevent me from buying the Z7 to use underwater compared to the D850.   The battery life seems up in the air so who really knows about that. But for me the Buffer is small. Sounds worse than the D800 and I really don't like missing shots while waiting for buffer to clear. Ugh. Especially with fast behavior fish like salmon.

Secondly the Low light AF ability using Contrast detection ( I believe) is enhanced with an assist light. Whether this will work underwater through a dome port is uncertain. And certainly where I dive low light focusing UW is crucial. With my current D800 it will still focus when I can barely see myself. ( I don't use focus lights as I don't like the soft spot you get when using a slow shutter speed.

Thirdly the sync speed. I routinely push my D800 to 1/400th, ( depending on how much of the scene the main subject fills). The D850 is 1/250 sync speed so I am assuming I could push it sometimes to 1/320. In my shallow brightly lit rivers with fast moving salmon 1/200 shutter speed is just too slow.

 



#26 miguelpereira

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Posted 23 September 2018 - 12:12 AM

D800 AF is rated from -2EV to 19EV while Z7 is from -3EV to 19EV. It's better to wait for some reviews but the Z7 on paper seems better in low light AF. Regarding flash sync speed the Z7 allows auto fp mode in which you can use any shutter speed with flash so probably it will be possible to use 1/320 with UW strobes like in the D850. Probably there will be some penalty regarding strobe power in doing so (for 1/250 and 1/320 ss). As for battery real world reviews talk about 1200 shots per battery which is not a deal breaker. There's also continuous AF tracking which seems to be not as good as D850.

#27 hyp

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Posted 23 September 2018 - 12:56 AM

This is not really anything new. Mirrorless has for a long time had an advantage in low light single shot AF. It has problems in AF-C and especially tracking, where DSLRs are still King of the Hill. 



#28 eikojnz

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Posted 23 September 2018 - 05:38 AM

The D850 is rated to -4EV and Z7 only -1 without AF assist. Not sure if it will work through the dome underwater, especially if its IR. Anyone know about this?



#29 MarkD

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Posted 23 September 2018 - 11:26 AM

The D850 is rated to -4EV and Z7 only -1 without AF assist. Not sure if it will work through the dome underwater, especially if its IR. Anyone know about this?

I think you're confusing two Z7 functions. It is the "Low light AF" custom function that increases low light autofocus capability from -1EV to -4EV. This is not an assist light but works with internal electronics at some expense of autofocus speed so should only be used in  extremely low light situations.

The "AF assist illuminator" on the other hand may be used in low light and outside a housing does shine a green light onto a close subject. As with most other housed cameras, I doubt that the assist illuminator will be useful underwater, but this has nothing to do with the Z7's inherent low light autofocus capability.

Incidentally, neither of these functions work with AFC mode.

The D850 and D500 DSLRs low light autofocus capability is better than the Z7 by specification (-4EV central spot and -3EV for the rest) and as far as I know this is available in AFC mode. -4EV corresponds to half-moonlight illumination so extremely low light and may be a lot darker than most of us try to autofocus even underwater. However, in his Z7 field report, Nikon Ambassador Marcel van Oosten suggests that the Z7 Low Light AF accuracy in AFS mode is even more accurate than with the D850. He does also say that from his limited experience (using pre-production firmware), that AF is in general not as fast as on a D850 and that tracking a moving subject is more challenging.

 

Mark



#30 eikojnz

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Posted 23 September 2018 - 11:47 PM

@MarkD Thanks for the clarification on the AF capabilities of Z7.



#31 miguelpereira

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Posted Today, 05:38 AM

Nauticam has announced their Z6/Z7 housing and acording to their data the housing has about the same size and weight than the D850 housing! If this is correct I can't see anyone using a Z6/Z7 underwater!





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