This might come in handy if you are trying to explain how a dSLR works to someone.
http://a.img-dpreview.com/articles/p...n/P3030599.jpg
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This might come in handy if you are trying to explain how a dSLR works to someone.
http://a.img-dpreview.com/articles/p...n/P3030599.jpg
Wow, fascinating.
I'm guessing the 3 bronze circular things at the bottom are AA batteries?
Didn't realise lenses had that much glass in them either!
Probably not AAs exactly, but they will be the cells whthin the battery pack (see the dark grey plastic surrounding the three cells).
And going by the large lump under the lens mount, it has to be a D3x. Have a look at the battery section on this page: http://www.dpreview.com/reviews/nikond3x/page4.asp
Also note the amount of glass within the camera body itself. Lens, prysm then three more lenses before you get to the eye piece.
D3 or D3x (not sure it's possible to tell those 2 apart) with a 14-24 2.8 - has to be by the way the front element is curved like that and the lack of filter threads.
The glass viewfinder prism is amazing - never knew they were THAT big.
It also shows why the new mirror-less DSLRs are so exciting - imagine how small that could be if you removed the space taken by the mirror box and the viewfinder. It'd be 1/3 as big.
I assumed it was the D3x, simply as it is newer and Nikon would want to pimp it :)
Not just size, but weight as well. There is also greater scope the change the design to improve/change the ergonomics. I'm not saying there is definitely a better way to build a camera like this, but you never know what will be on the market this time next year or the year after that.
Interesting times for the camera market. We could finally be moving out of the stagnant and, quite frankly, boring models that have fludded stores over the past couple of years.
http://www.blogcdn.com/www.engadget....olymft_400.jpg
:)
Yup - that Olympus mock-up is what I was referring to over in the Micro 4/3ds thread. Can't afford it, doesn't even exist yet, but I want one! Shame they didn't announce it at PMA.
It is the D3x. This was at a show when it was launched.Quote:
Originally Posted by Funkstar
Yup, you need - for a simple case - a minimum of four lenses for a zoom lens (technically camera lenses are groups of lenses).Quote:
Originally Posted by Virtual Monkey
The more light you get in the better things are for you, so you need massive lenses at the front to bring in light (and you often need two or three to bend the light coming in from the first one). These are the front elements. As mentioned above, this is a wide angle lens and is thus going to need that whopping curved thing at the front to get all that 14mm goodness in :P
Next is what i've labelled the zoom group, though not sure what it is technically. Basically a group of three lenses, a concave lens sandwiched between two convex ones. I'm not sure how it works in that picture, but for a zoom lens, one of those elements will be on rails and is what you're moving when you turn the barrel. The concave lens right next to the convex lens is an achromatic doublet (i think), it's basically to minimse the effect of chromatic aberration caused by different wavelengths refracting by different amounts.
Finally, at the back, you have a series of focussing elements which get the light in line and focussed for the sensor.
The aperture will be somewhere between the zoom elements and the focussing elements.
Here's my badly annotated (i think it's mostly right) picture:
http://img255.imageshack.us/img255/4...osssection.png
As an aside, the f/# of a camera is the focal length of the camera divided by the collecting diameter (f/#=N=f/D) (this is the APERTURE opening diameter NOT the front element diameter) - note that the aperture diamater is often a smaller because the lenses behind it magnify it a bit. Having large elements to get lots of light in at the front helps a lot, as does coating!
You see, this is how lenses get very expensive very quickly - and how it's kind of impractical to make a 400mm f/1.4 lens (and how massive it would have to be).