D600 is using Full Frame sensor (FX). 24mm will give you actual 24mm.
D90 is Crop Sensor (DX). The crop factor is 1.5X, so whatever lens you mount, you need to multiply by 1.5X to get the actual focal length (in 25mm format). So your 18mm, when mount on your D90, the focal length will be 27mm.

Other than that, 18-105mm kit lens on the D90 is a DX lens, while the 24-85mm kit lens that comes with D600 is a FX lens.

Yes, that's the advantage of Nikon. When you mount DX lens on full frame camera, there is a CROP Mode, where your 18mm DX lens will become 27mm due to the Crop Mode, this is because the lens cannot utilize the full frame sensor area. Hence, a DX lens.

As for image quality, can't comment because I have no experience using both and compare. But FX lens are more expensive and when mount on DX, it should give better result because it's utilizing the centre area which is usually the strength of the lens. The problem is when you mount on DX body, 24mm will become 36mm which is no longer wide.

Built quality, feel wise, I believe the D600 bundled lens will be much better. Perhaps when you try and feel both you will know. Besides, aperture wise, the bundled lens for D600 is f/3.5 to f/4.5, plus it's a refresh of the older yet very good 24-85mm f/3.5-4 AF-D.

Let me "try" to answer this questions in my humble opinion... 

Kit lens are "usually" sold to first time DSLR buyer... and I think Nikon is targeting D600 to first time DSLR FX users or users upgrading from DX to FX body... ( or people with lots of dough and no dunno where to spend it...    )

The lens zoom range is too subjective and depends on your requirements, do you shoot more landscape, portraits, birds or everything in between...

If the zoom range fit your budget/requirements, then buy the kit, or else just get the body only and buy the lens or a few lens to fit your budget/spending/requirements...

Goto http://www.mylensdb.com/ and do your own comparison la...

200-3200 is what we call the "native ISO". Where else the "100" is actually Lo1.0 which is aided by the processor, sames goes with 6400 which should be hi1.0

http://fstoppers.com/what-googles-predicti...hers-and-models

hahaha 

umm...50mm 1.8 is the go to lens

u mean 18-105? no real equivalent...at least cheap ones.
closest cheap-ish one is old 28-200...
newer cheap-ish one is 24-85...
if got money 24-120

simple

the more expensive ones is the better ones 

bt once u're into FF, i think u would look into those primes instead..
cheapo 50mm 1.4, or the 35mm 1.4.. cz those 24-120 n other zoom lens arent as sharp as the primes..

I think they refer to 24-120 f4, try find that see got or not.
I am using the kit lens from d600 24-85mm, in term of low light conditions, it will hunt like mad. but it was good in normal condition, zoom range is good enough and it was light enough to carry around.
At this moment I looking at 35-70 f2.8d at ebay

What about this.........?  


Flower by Pro3363, on Flickr

BTW, is this better than yesterday's.....?  


Flower by Pro3363, on Flickr

random shot with my D5100 + 85mm f1.8g

at penang

Fisherman's life by Song laa, on Flickr

Evening spam...... Please comment.....  


Flower by Pro3363, on Flickr

thanks but not sure man.. all i know is near the taman negara there

Good try bro

Maybe you can search some pictures here:

http://tinyurl.com/a7evm87

Maybe u can view some of our pictures here, during the LYN outing last year

http://forum.lowyat.net/index.php?showtopi...70&hl=bird+park

Hei guys I'm one of the Nikon family now ...just purchased a D3100

Hello guys and girls, here's one for the new year!

Paris Cityscape

One long exposure shot for the last day of 2012!

Barbados Long Exposure

Enjoy!