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Originally Posted by clevermax I think we cannot generalize like that.
I can only think of two factors which are not present in a DSLR's light path.
1) The translucent mirror induced light loss
2) The light path always has the mirror - any distortions introduced because of that.
Otherwise, the way images are casted on a DSLR and SLT's sensor just in the same way.
1) Light loss - studies on the light loss have shown that there is about 1/3rd stop loss at the maximum, due to the translucent mirror directing light towards the phase detection AF mechanism The permiability will be less than 80 according to tests done on A55's translucent mirror.
Now, take two cameras in the same league - a DSLR and SLT with similar lenses. Click the same frame with the same shutter speed, same aperture and same ISO speed - you will notice that there is no lack of exposure on the SLT's picture compared to the DSLR's. Why? Ideally there should be a difference because there is light loss of about 0.3EV. The images appear same because the ISO calibration on an SLT is slightly above that in a DSLR. This increased sensor gain compensates for the light loss. There is no big difference in the ISO calibraration. It will be like ISO120-ish when you set ISO at 100 in an SLT and in a DSLR it will be true ISO100 itself. Having said that, the image quality should now be a tad bit less on the SLT because of the slightly higher ISO.
But... an improved sensor with better ISO capabilites can easily suprass the miniscule problem that we're talking about. So a mid/high range SLT with improved sensor will be much better in IQ than a entry level DSLR, just in the same way a mid/high range DSLR is.
2) Lack of image detail due to the mirror in the light's path (aditional air-glass-air surfaces)
There are photographic tests with samples available in in various places, which shows thelack of image deatil is hard to recognize even in the 100% crops. I can post samples from my own camera to show this.
In my opinion, it is not the image quality that an SLT user needs to be worried about. In fact, this is not a thing to worry at all in my opinion. It is the issues with the EVF that can be a 'real' problem though the imapct is limited to only certain shooting conditions:
EVF simulates your photo before clicking and when flash is used (in camera) it takes some time to adjust the gain before shutter is released. Secondly, when you use external flashes which the camera doesn't know about, the simulation goes wrong. |
As you said, it does not matter what one does, in the end of the day its similar to adding the filters to a lens, another piece of glass will always be there and it will always be reducing 1/3 stop of light. Of course we can always compensate but in the end we are still compensating.
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Originally Posted by clevermax DSLR will be obsolete, SLT is a stop gap arrangemnt and mirror less will be the way to go.. |
I think we cannot generalize like that
I doubt DSLR's will be obsolete, dx bodies might get affected in terms of sales but FF bodies will remain, but then again there is more to it than just sensor size, shooting a full wedding with something smaller than D3/1D is a killer on hands, especially when using pro lenses.
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Originally Posted by clevermax In OVF you get to see the real scene, but a picture can be over exposed or underexposed depending on your settings, but in EVF, what you see on the EVF will be pretty much what you get, since it already simulates the scene based on your exposure settings. This is what zoombiee meant - I am sure! |
OVF and EVF is a completely different discussion and has nothing to do with DSLR vs SLT discussion as both are OVF
And when one says what you see is what you get, its more about image composition and DOf than exposure. There is bar in every DSLR I have owned that shows if image in over/under exposed. Once we get into image exposure settings well, none of the viewfinders matter in that respect, for example, I could be doing star trails and not a single viewfinder will be able to show me the final image, be it OVF or EVF. Similarily I could be doing panning and again not a single viewfinder will be able to show me the final image, be it OVF or EVF.
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Originally Posted by nilanjanray Yes, I am hoping that the D400 gets released later this year, and that it is a significant improvement over current DX bodies and sets a new standard for DX.
And what is the problem with that?
There are plenty of folks like me who need/want a proDx from Nikon incorporating the latest tech that Nikon has to (or wants to) offer.
The Fortuner too took its time coming to India  |
Please read what I said, At this stage we are assuming what D400 will be and when it will be released and what D600 will be and when it will be released. Then we are assuming what AF both of these bodies will have.
I never said there is a problem with a Dx body with AF from D4/D800. D300/s was/is certainly a bit hit, even looking at canon camp, 7D is a big seller and it has been selling like hot cakes.
The issue is rumors, Nikon rumors state D600 will have 39 point AF and not the AF from D4/D800 and a price point of $1500. Sure that is awesome, there is a huge demand for cheap FF body with less bells and whistles, I myself know few landscape shooters who will go nuts with a new cheap FF body.
But what does that mean for a high end Dx body, it would need to be around $1300 price point and AF cannot be better than D600, yet rumor is AF will be from D4/D800, that is not possible at $1300 price point. Otherwise it would undercut D600 sales, or D600 would undercut D400 sales.
But in the end of the day its all speculation and rumors only. Nothing can be guaranteed till Nikon raises the curtain.
Yes fortuner was not released in India till late, but it was released everywhere and its specs were well known before it came to India, not the same case with Nikon, Nikon/Canon release products in JAPAN, then its individual Nikon company in the respective country that buys it off them and gets the shipment. Nikon Japan has no control over what Nikon India decides to bring to India, or so I have been told by few guys in trade here.
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Originally Posted by Samurai For years I have been hearing, mostly on DPreview reviews and forums that Olympus has the best jpeg engine out there. But then I almost always use RAW, so I can't vouch for that. |
I cannot say much about Olympus camp, never used a Olympus DSLR, but Olympus Pens (the ones I have given a go) have good jpeg output, but EVF was a killer for me.