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03-31-2012, 02:31 PM   #16
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QuoteOriginally posted by Na Horuk Quote
I find it odd that it has a lower bit depth than the K-5? Or did I misunderstand that somehow? Thought they had the same physical sensor.
Files get smaller and a lot of people would like that.

The K-5 has also iso 80 and probably this is what lifts it the most above Nex7 and D7000.

03-31-2012, 04:45 PM   #17
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Iso 80 on the K5 rocks my world. Flawless image quality really...
04-01-2012, 10:15 AM   #18
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I don't know where I picked it up, but from what I was told by someone very knowledgeable, that digital camera sensors are made to operate at a certain level of amplification without much noise. It usually is the default lowest and that raising or lowering the ISO from there, either forced or through turning on extended ISOs, creates more noise. So if a camera has an ISO that starts at 100, but can be brought to 80 or 50 with extensions, you would suffer a noise penalty. Any salt to that?
04-01-2012, 10:59 AM   #19
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Yep, true AFAIK

04-01-2012, 06:44 PM   #20
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QuoteOriginally posted by thibs Quote
Yep, I agree but that's why I brought this. I wanna know more about their testing...
They are explained on their site: DxOMark - Lens scores.
04-01-2012, 08:17 PM   #21
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QuoteOriginally posted by Laurentiu Cristofor Quote
They are explained on their site: DxOMark - Lens scores.

Any group that gives the 15mm a '10' when the top lenses are getting scores in the 30's doesn't really need to explain anything to me.
04-02-2012, 07:45 AM   #22
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K-01 #1 in low light of all mirrorless cameras

DxOMark - List view
04-02-2012, 08:09 AM   #23
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QuoteOriginally posted by ElJamoquio Quote
Any group that gives the 15mm a '10' when the top lenses are getting scores in the 30's doesn't really need to explain anything to me.
Lens score should be considered with the testing platform (camera). The top lenses scoring 30-34 are on full frame cameras. All their lenses appear to get a +10 or +12 factor when shown on a full frame. If you take the lenses tested on the D3x and drop to the D7000, you'll get a -12 to the score, putting it closer to what the Pentax lenses are scored at.

Now, that being said - the top scoring Pentax lens is the DA 35 F2.4 on the k-5. It outscored (at 15, so full frame would be 27-28):

DA 70mm Limited
DFA 100mm WR
DFA 50mm F2.8
DA 40mm Limited

Just a quick comparo of the 35 F2.4 and the 100 WR, both reached 46lpmm, the 100 WR has 0% distortion vs 3% on the 35mm, the 100 WR has 0.5ev less vignetting than the 35 F2.4, and it's chromatic abberations are 3 micrometers smaller.

The only thing the 35 F2.4 has on the 100WR is light transmission, which seems to be at .6Tstops better. Now, the general mark of the Limited lenses are the lower light transmission, and it seems to be the big factor in the DXO score. In fact, the 40mm F2.8 is also 46lpmm, 2% distortion, same vignetting, and less chromatic aberrations, but lower light transmission and it scores 4 points lower than the 35 F2.4.

It's weird.

04-02-2012, 08:29 AM   #24
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They should make a different score list for APS-C since the difference between good and average is only two points now (or some alike).

QuoteOriginally posted by JinDesu Quote
Lens score should be considered with the testing platform (camera). The top lenses scoring 30-34 are on full frame cameras. All their lenses appear to get a +10 or +12 factor when shown on a full frame. If you take the lenses tested on the D3x and drop to the D7000, you'll get a -12 to the score, putting it closer to what the Pentax lenses are scored at.

Now, that being said - the top scoring Pentax lens is the DA 35 F2.4 on the k-5. It outscored (at 15, so full frame would be 27-28):

DA 70mm Limited
DFA 100mm WR
DFA 50mm F2.8
DA 40mm Limited

Just a quick comparo of the 35 F2.4 and the 100 WR, both reached 46lpmm, the 100 WR has 0% distortion vs 3% on the 35mm, the 100 WR has 0.5ev less vignetting than the 35 F2.4, and it's chromatic abberations are 3 micrometers smaller.

The only thing the 35 F2.4 has on the 100WR is light transmission, which seems to be at .6Tstops better. Now, the general mark of the Limited lenses are the lower light transmission, and it seems to be the big factor in the DXO score. In fact, the 40mm F2.8 is also 46lpmm, 2% distortion, same vignetting, and less chromatic aberrations, but lower light transmission and it scores 4 points lower than the 35 F2.4.

It's weird.
04-02-2012, 08:36 AM   #25
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Oh, so transmission might be the big thing? Would the SMC have an effect on that? lol are they basically counting one of Pentax' strengths as a bad thing?
04-02-2012, 08:41 AM   #26
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QuoteOriginally posted by Na Horuk Quote
Oh, so transmission might be the big thing? Would the SMC have an effect on that? lol are they basically counting one of Pentax' strengths as a bad thing?
Could be - I don't actually know what else is affecting the transmission. I understand that coatings, number of elements, and the glass type(?) would affect transmission. I am inferring that transmission is huge in DXO scoring based on how they scored the Pentax lenses. If true, that's an unfortunate thing against Pentax lenses.
04-02-2012, 08:42 AM   #27
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K-01 @ 100iso vs K-5 @ 80 iso

QuoteOriginally posted by ZizZ^ Quote
Iso 80 on the K5 rocks my world. Flawless image quality really...
Wow, the K-01 looks better @ 100 iso than the K-5 @ 80 iso !



K-01 @ 100iso on left .............and K-5 @ 80 iso on right K-5
04-02-2012, 08:49 AM   #28
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QuoteOriginally posted by jogiba Quote
Wow, the K-01 looks better @ 100 iso than the K-5 @ 80 iso !
The K-01 is slightly sharper than the K-5 by default which contributes to better contrast detail. Having said that, I've found both systems to be equal when all is said and done in terms of maximum detail after processing. Which works in RAW, though something tells me that the K-01 would have the upper hand in OOC output.

PS. I think the K-01 likely gains ground on the K-5 in areas like shutter blur/vibrations.
04-02-2012, 09:53 AM   #29
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QuoteOriginally posted by JinDesu Quote
Lens score should be considered with the testing platform (camera). The top lenses scoring 30-34 are on full frame cameras. All their lenses appear to get a +10 or +12 factor when shown on a full frame. If you take the lenses tested on the D3x and drop to the D7000, you'll get a -12 to the score, putting it closer to what the Pentax lenses are scored at.

Now, that being said - the top scoring Pentax lens is the DA 35 F2.4 on the k-5. It outscored (at 15, so full frame would be 27-28):

DA 70mm Limited
DFA 100mm WR
DFA 50mm F2.8
DA 40mm Limited

Just a quick comparo of the 35 F2.4 and the 100 WR, both reached 46lpmm, the 100 WR has 0% distortion vs 3% on the 35mm, the 100 WR has 0.5ev less vignetting than the 35 F2.4, and it's chromatic abberations are 3 micrometers smaller.

The only thing the 35 F2.4 has on the 100WR is light transmission, which seems to be at .6Tstops better. Now, the general mark of the Limited lenses are the lower light transmission, and it seems to be the big factor in the DXO score. In fact, the 40mm F2.8 is also 46lpmm, 2% distortion, same vignetting, and less chromatic aberrations, but lower light transmission and it scores 4 points lower than the 35 F2.4.

It's weird.
I, unfortunately, took the time to understand their process and thought pattern.

But their process is completely wrong. Many times I've put the 15mm on, looked through the viewfinder, and just said 'wow'.
04-02-2012, 10:13 AM   #30
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QuoteOriginally posted by ElJamoquio Quote
I, unfortunately, took the time to understand their process and thought pattern.

But their process is completely wrong. Many times I've put the 15mm on, looked through the viewfinder, and just said 'wow'.
Well, pixie dust is incredibly hard to measure
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