Bjorn_L

I don't want this one, but there is a market for it.
For example, Have kids in sports? The only weather sealed options are the rx10 mk1, 2 & 3. The only other options are a gh3/gh4 w/ 35-100...

I find that I go well above 6400 all the time now that I have a camera capable of good results there. Before I would most typically not take the shot or make some compromise (insufficient shutter...

It's funny isn't it? You will whine and complain and pick it apart. You'll suggest strongly that it isn't as good as your d750. You'll state you'll see if the dxo reports are worth a hoot. But...

The image quality seems pretty good. I like the bokeh, the very flattering perspective too (from that FL as a long portrait lens). The lens looks like a real beast. It might balance a little...

The negative reviews are not (for the most part) "bad people" or "bad comments". They are frank and honest.
I love kids. I love the photos my kids take (3 boys, which have all had their own...

This is a complete bone-head move. But one I suspect can (and likely will) eventually be addressed with a firmware update.

I'd say most of the cost is based on the different optics and different focus systems. Cost and weight are not reliable indicators of sealed not sealed.
And as I posted directly above:
As for...

As for moisture vs weather sealing.... water penetrates faster than dust and rain is generally comprised of water. So not sure what their claims do or do not mean.
But, I'm not making those...

I don't think it adds much to the cost. Both Sigma and Tamron offer sealing on their 150-600 options. In the case of the Tamron, it costs less than the Nikon.
From the Tamron...

According to multiple reviews the Tamron is also weather sealed. for example:
http://www.the-digital-picture.com/Reviews/Tamron-150-600mm-f-5-6.3-Di-VC-USD-Lens.aspx
From the Tamron...

For openers the Nikon is not sealed and Sigma and Tamron offer sealed units. It will have to really out perform them to be interesting to me, and even then I'll probably pass because I am out in...

Disappointed that sealed remains the exception not the rule. Particularly the super-telephoto.
Adding weather sealing to most lenses would seem to be a low cost option and an easy way to add...

The d3s is far larger and heavier.  1240g vs 750g For your described shooting goals, I see nothing which would benefit from a specialized camera such as the d3s rather than a d750.

What are you going to shoot?  Do you have a scenario where the d3s will serve you better? I had a chance to get a d3s with far fewer actuations than that (60,000 or so) and I passed.  Not because ...

The above is completely false.  Beagle1 likes to say this same thing over and over.  But it remains false.  Canon has slightly fewer lenses than Nikon, though both have plenty.  The older sensor ...

Either one will get it done. Both are good cameras. The Nikon's sensor performs a better: http://www.dxomark.com/Cameras/Compare/Side-by-side/Canon-EOS-6D-versus-Nikon-D610___836_915 The Nikon has ...

@pkosewski
The Nikon 24-70 is just bullet proof. Nothing better on the market. It is very well sealed.
The Tamron 24-70 f/2.8 adds stabilization (VC) and is also sealed, I would trust the Nikon...

Dennis,
All current Nikon lenses have some sealing. I wrote to Nikon a while ago to ask about it and they said brief use in a light rain would not be a problem. The rear has a gasket, the buttons...

I've shot both and think the Nikon is a bit better, but that might also be for the way that I shoot (sports, low light and some other challenging situations).  The 70d is still pretty good in this ...

It is also useful in tracking other fast moving stuff.  I used it recently on my d750 when shooting a couple of track meets.  It 'found' and followed motion much better than with a single AF point ...