manmachine242

manmachine242

Lives in Hungary Debrecen, Hungary
Works as a Electrical Engineer / Economist
Has a website at http://nagykrisztian.com
Joined on Jan 10, 2007

Comments

Total: 24, showing: 1 – 20
« First‹ Previous12Next ›Last »
On Panasonic Lumix DMC-GM1 Review preview (354 comments in total)

The game of the year: Find the yellow spot!

http://prohardver.hu/dl/upc/2013-12/213941_gm1_dof.thumb.jpg

Direct link | Posted on Dec 19, 2013 at 14:41 UTC as 95th comment
On Panasonic DMC-GM1 preview (631 comments in total)

There is something wrong with "equivalent aperture" comparison.

Q7 has 1/1.7'' type sensor, multiplier is 4.55.

2.8 x 4.55 = 12.74 (and not f/17 as chart shows)

Direct link | Posted on Oct 17, 2013 at 04:40 UTC as 215th comment | 6 replies
On Panasonic unveils HX-A100 wearable camcorder article (39 comments in total)

Smallest sensor, fullHD. I am skeptical.

Direct link | Posted on Jan 8, 2013 at 15:20 UTC as 10th comment | 1 reply
On Panasonic Lumix DMC-GH3 Preview preview (416 comments in total)
In reply to:

Sergi Gabriel: If max resolution = 4608 x 3456 (4:3 ratio), then Effective pixels

= 4608 x 3456 = 15 925 248 Pixels = 15 925 248/1024/1024 = 15.1875 MegaPixel.

For 3:2 ratio max resolution = 4608x3072 = 14.156 MegaPixels
For 16:9 ratio max resolution = 4608x2592 = 11.39 MegaPixels

Not 16.1 megapixels like in specification. It is narketing game from vendor.

Or an inattention of dpreview. There is a native 4:3 sensor in the GH3, no real multi-aspect.

Direct link | Posted on Sep 17, 2012 at 13:13 UTC
On Just Posted: Olympus OM-D E-M5 test samples article (458 comments in total)
In reply to:

ogo: Why can't people just admit that a 4/3 sensor can be good at high ISO, and instead of that just say that Olympus cheated on high iso ?

Now think about this :
- R. Butler clearly stated that you can't use those studio samples to judge ISO scale
- for those shots E-M5 exposure times are the same that Panasonic GX1. Did anyone accuse Panasonic to cheat here ? Just look at DXOMark of GX1 (DXOmark being the "reference" for those accusing Oly to cheat). GX1 is right on scale
- you can't compare exposure for 4/3 and other sensors because the aspect ratio is not the same (3:2 vs 4:3). 3:2 sensors have more white on the sides to expose, thus making the comparison impossible
- you ignore light transmission differences between lenses (T-stops) which can have a big impact
- studio samples on another site (focus-numerique.com) show same exposure times for NEX-5N and E-M5, and still the noise results are very comparable with what is shown here.

After you wrote technical supidities and you could not demostrate any of them the only weapon that resmains for you is scoffing and indulging in personalities.

Direct link | Posted on Mar 17, 2012 at 12:03 UTC
On Just Posted: Olympus OM-D E-M5 test samples article (458 comments in total)
In reply to:

ogo: Why can't people just admit that a 4/3 sensor can be good at high ISO, and instead of that just say that Olympus cheated on high iso ?

Now think about this :
- R. Butler clearly stated that you can't use those studio samples to judge ISO scale
- for those shots E-M5 exposure times are the same that Panasonic GX1. Did anyone accuse Panasonic to cheat here ? Just look at DXOMark of GX1 (DXOmark being the "reference" for those accusing Oly to cheat). GX1 is right on scale
- you can't compare exposure for 4/3 and other sensors because the aspect ratio is not the same (3:2 vs 4:3). 3:2 sensors have more white on the sides to expose, thus making the comparison impossible
- you ignore light transmission differences between lenses (T-stops) which can have a big impact
- studio samples on another site (focus-numerique.com) show same exposure times for NEX-5N and E-M5, and still the noise results are very comparable with what is shown here.

@ Antony John:

Quote:
"@ Manmachine, quick look, Panny 45-175 5.2 TStop.
And it doesn't have "15 to 20 elements""

So what we are talking about?

This sentence shows that you simply do not know what stops and aperture means.

Direct link | Posted on Mar 17, 2012 at 11:21 UTC
On Just Posted: Olympus OM-D E-M5 test samples article (458 comments in total)
In reply to:

ogo: Why can't people just admit that a 4/3 sensor can be good at high ISO, and instead of that just say that Olympus cheated on high iso ?

Now think about this :
- R. Butler clearly stated that you can't use those studio samples to judge ISO scale
- for those shots E-M5 exposure times are the same that Panasonic GX1. Did anyone accuse Panasonic to cheat here ? Just look at DXOMark of GX1 (DXOmark being the "reference" for those accusing Oly to cheat). GX1 is right on scale
- you can't compare exposure for 4/3 and other sensors because the aspect ratio is not the same (3:2 vs 4:3). 3:2 sensors have more white on the sides to expose, thus making the comparison impossible
- you ignore light transmission differences between lenses (T-stops) which can have a big impact
- studio samples on another site (focus-numerique.com) show same exposure times for NEX-5N and E-M5, and still the noise results are very comparable with what is shown here.

@ ogo

"I give up with you"

It is a best thing from anybody who continously mix up the ttl and the external metering.

Direct link | Posted on Mar 17, 2012 at 11:08 UTC
On Just Posted: Olympus OM-D E-M5 test samples article (458 comments in total)
In reply to:

ogo: Why can't people just admit that a 4/3 sensor can be good at high ISO, and instead of that just say that Olympus cheated on high iso ?

Now think about this :
- R. Butler clearly stated that you can't use those studio samples to judge ISO scale
- for those shots E-M5 exposure times are the same that Panasonic GX1. Did anyone accuse Panasonic to cheat here ? Just look at DXOMark of GX1 (DXOmark being the "reference" for those accusing Oly to cheat). GX1 is right on scale
- you can't compare exposure for 4/3 and other sensors because the aspect ratio is not the same (3:2 vs 4:3). 3:2 sensors have more white on the sides to expose, thus making the comparison impossible
- you ignore light transmission differences between lenses (T-stops) which can have a big impact
- studio samples on another site (focus-numerique.com) show same exposure times for NEX-5N and E-M5, and still the noise results are very comparable with what is shown here.

@ Antony John

You could not show any example from DXO where difference in transmission more than 0.1 EV with similar lenses, but you talk about 0.7EV effect.

So which statement was wrong?

Direct link | Posted on Mar 17, 2012 at 11:03 UTC
On Just Posted: Olympus OM-D E-M5 test samples article (458 comments in total)
In reply to:

ogo: Why can't people just admit that a 4/3 sensor can be good at high ISO, and instead of that just say that Olympus cheated on high iso ?

Now think about this :
- R. Butler clearly stated that you can't use those studio samples to judge ISO scale
- for those shots E-M5 exposure times are the same that Panasonic GX1. Did anyone accuse Panasonic to cheat here ? Just look at DXOMark of GX1 (DXOmark being the "reference" for those accusing Oly to cheat). GX1 is right on scale
- you can't compare exposure for 4/3 and other sensors because the aspect ratio is not the same (3:2 vs 4:3). 3:2 sensors have more white on the sides to expose, thus making the comparison impossible
- you ignore light transmission differences between lenses (T-stops) which can have a big impact
- studio samples on another site (focus-numerique.com) show same exposure times for NEX-5N and E-M5, and still the noise results are very comparable with what is shown here.

The only thing I can do is repeat myself: Your examples show that you simply do not understand the simplest basics of optics, like aperture etc.

Direct link | Posted on Mar 17, 2012 at 10:29 UTC
On Just Posted: Olympus OM-D E-M5 test samples article (458 comments in total)
In reply to:

ogo: Why can't people just admit that a 4/3 sensor can be good at high ISO, and instead of that just say that Olympus cheated on high iso ?

Now think about this :
- R. Butler clearly stated that you can't use those studio samples to judge ISO scale
- for those shots E-M5 exposure times are the same that Panasonic GX1. Did anyone accuse Panasonic to cheat here ? Just look at DXOMark of GX1 (DXOmark being the "reference" for those accusing Oly to cheat). GX1 is right on scale
- you can't compare exposure for 4/3 and other sensors because the aspect ratio is not the same (3:2 vs 4:3). 3:2 sensors have more white on the sides to expose, thus making the comparison impossible
- you ignore light transmission differences between lenses (T-stops) which can have a big impact
- studio samples on another site (focus-numerique.com) show same exposure times for NEX-5N and E-M5, and still the noise results are very comparable with what is shown here.

@ Antony John:

Do you really know what that word "aperture" means?

Panasonic 45-175 is an 1:4.0 - 5.6 lens
The TStops: 4.3 - 5.7, the 5.2 is an average value.

Click on "measurements" and click "transmission" after.
Look at the bottom diagram called "T-Stop difference to manufacturer"
All that you see is the effect of entrance pupil/focal length ratio, not the effect of reflection on surfaces.

And now, do the same thing with a prime lens.

Direct link | Posted on Mar 17, 2012 at 10:04 UTC
On Just Posted: Olympus OM-D E-M5 test samples article (458 comments in total)
In reply to:

ogo: Why can't people just admit that a 4/3 sensor can be good at high ISO, and instead of that just say that Olympus cheated on high iso ?

Now think about this :
- R. Butler clearly stated that you can't use those studio samples to judge ISO scale
- for those shots E-M5 exposure times are the same that Panasonic GX1. Did anyone accuse Panasonic to cheat here ? Just look at DXOMark of GX1 (DXOmark being the "reference" for those accusing Oly to cheat). GX1 is right on scale
- you can't compare exposure for 4/3 and other sensors because the aspect ratio is not the same (3:2 vs 4:3). 3:2 sensors have more white on the sides to expose, thus making the comparison impossible
- you ignore light transmission differences between lenses (T-stops) which can have a big impact
- studio samples on another site (focus-numerique.com) show same exposure times for NEX-5N and E-M5, and still the noise results are very comparable with what is shown here.

"More white on image means more incoming light"

:D

http://en.wikipedia.org/wiki/Light_meter

Direct link | Posted on Mar 17, 2012 at 09:59 UTC
On Just Posted: Olympus OM-D E-M5 test samples article (458 comments in total)
In reply to:

ogo: Why can't people just admit that a 4/3 sensor can be good at high ISO, and instead of that just say that Olympus cheated on high iso ?

Now think about this :
- R. Butler clearly stated that you can't use those studio samples to judge ISO scale
- for those shots E-M5 exposure times are the same that Panasonic GX1. Did anyone accuse Panasonic to cheat here ? Just look at DXOMark of GX1 (DXOmark being the "reference" for those accusing Oly to cheat). GX1 is right on scale
- you can't compare exposure for 4/3 and other sensors because the aspect ratio is not the same (3:2 vs 4:3). 3:2 sensors have more white on the sides to expose, thus making the comparison impossible
- you ignore light transmission differences between lenses (T-stops) which can have a big impact
- studio samples on another site (focus-numerique.com) show same exposure times for NEX-5N and E-M5, and still the noise results are very comparable with what is shown here.

@ ogo:

There is no connection between histogram and a cropped image where we try to find details and define the noise.

Download two images, load them into an image editor software, and measure the pixels at the same area. They are very similar, but exposure values show 2/3 EV difference.

Direct link | Posted on Mar 17, 2012 at 09:46 UTC
On Just Posted: Olympus OM-D E-M5 test samples article (458 comments in total)
In reply to:

ogo: Why can't people just admit that a 4/3 sensor can be good at high ISO, and instead of that just say that Olympus cheated on high iso ?

Now think about this :
- R. Butler clearly stated that you can't use those studio samples to judge ISO scale
- for those shots E-M5 exposure times are the same that Panasonic GX1. Did anyone accuse Panasonic to cheat here ? Just look at DXOMark of GX1 (DXOmark being the "reference" for those accusing Oly to cheat). GX1 is right on scale
- you can't compare exposure for 4/3 and other sensors because the aspect ratio is not the same (3:2 vs 4:3). 3:2 sensors have more white on the sides to expose, thus making the comparison impossible
- you ignore light transmission differences between lenses (T-stops) which can have a big impact
- studio samples on another site (focus-numerique.com) show same exposure times for NEX-5N and E-M5, and still the noise results are very comparable with what is shown here.

@ Antony John:

DXO Mark results:

Canon 50mm 1.4 : 1.6TStops
Nikon 50mm 1.4: 1.6TStops
Zeiss 50mm 1.4: 1.6TStops
Sigma 50mm 1.4: 1.7 TStops
Sony 85mm 1.4: 1.6 TStops
Sigma 85mm 1.4: 1.6 TStops
Nikon 35mm 1.4: 1.7TStops

So where is that huge difference?

The difference between real and nominal aperture is much significant, that difference is transmission. Look at the lens patents. The real aperture of an 1.4 lens is about 1.35 to 1.45.

Direct link | Posted on Mar 17, 2012 at 09:40 UTC
On Just Posted: Olympus OM-D E-M5 test samples article (458 comments in total)
In reply to:

ogo: Why can't people just admit that a 4/3 sensor can be good at high ISO, and instead of that just say that Olympus cheated on high iso ?

Now think about this :
- R. Butler clearly stated that you can't use those studio samples to judge ISO scale
- for those shots E-M5 exposure times are the same that Panasonic GX1. Did anyone accuse Panasonic to cheat here ? Just look at DXOMark of GX1 (DXOmark being the "reference" for those accusing Oly to cheat). GX1 is right on scale
- you can't compare exposure for 4/3 and other sensors because the aspect ratio is not the same (3:2 vs 4:3). 3:2 sensors have more white on the sides to expose, thus making the comparison impossible
- you ignore light transmission differences between lenses (T-stops) which can have a big impact
- studio samples on another site (focus-numerique.com) show same exposure times for NEX-5N and E-M5, and still the noise results are very comparable with what is shown here.

"3:2 sensors have more white on the sides to expose, thus making the comparison impossible"

I hope you have heard about method of measure the incoming light. It is only 50 years old at least.

" light transmission differences between lenses (T-stops) which can have a big impact"

It is a misbelief. The difference between transmissions is only a few percent, especially in these lenses which do not contain 15..20 elements. Light loss at surfaces with modern multi coating is 0.2 - 0.3%. We are in year 2012, not in 1930.

Twenty surfaces can produce 5-6% loss, the difference between transmissions of two prime lenses is only 2-3%.

Direct link | Posted on Mar 17, 2012 at 09:05 UTC
On Just Posted: Olympus OM-D E-M5 test samples article (458 comments in total)
In reply to:

manmachine242: ISO3200:
NEX5n: 1/800, f8
7D: 1/640, f9
E-M5: 1/800 f6.3

ISO200:
NEX5n: 1/50 f8
7D: 1/40 f9
E-M5: 1/50 f6.3
G3: 1/80 f6.3

The difference is consistently 2/3 EV.

real sensitivity of E-M5 at ISO200 = ISO125 on 7D, NEX5n, G3
real sensitivity of E-M5 at ISO3200 = ISO2000 on 7D, NEX5n

citizenlouie: You have misinterpreted the meaning of exposure value and ISO.

Direct link | Posted on Mar 17, 2012 at 00:20 UTC
On Just Posted: Olympus OM-D E-M5 test samples article (458 comments in total)

There is a problem with all dpreview test samples if the compared cameras have different aspect ratios.

The constant height of object plane is invented to measure a special resolution parameter, the linepair / picture height.

But now, we try to judge the noise and noise filtering performance by means of details. In these samples the optical, lateral magnification is different with 3:2 APS-C and 4:3 mFT sensors. The same object shows different amount of pixels on different sample photos even if the cameras have same number of pixels.

It makes the whole comparing a bit meaningless. The 3:2 and 4:3 crops of object plane should have same diagonal size, not same height. I would not like to link that french site which uses the correct technique (only from this point of view), but dpreview should have rethink this.

Direct link | Posted on Mar 16, 2012 at 23:31 UTC as 79th comment | 1 reply
On Just Posted: Olympus OM-D E-M5 test samples article (458 comments in total)
In reply to:

manmachine242: ISO3200:
NEX5n: 1/800, f8
7D: 1/640, f9
E-M5: 1/800 f6.3

ISO200:
NEX5n: 1/50 f8
7D: 1/40 f9
E-M5: 1/50 f6.3
G3: 1/80 f6.3

The difference is consistently 2/3 EV.

real sensitivity of E-M5 at ISO200 = ISO125 on 7D, NEX5n, G3
real sensitivity of E-M5 at ISO3200 = ISO2000 on 7D, NEX5n

There is an extremly big problem if the difference between transmissions causes 2/3EV loss...

Direct link | Posted on Mar 16, 2012 at 22:29 UTC
On Just Posted: Olympus OM-D E-M5 test samples article (458 comments in total)
In reply to:

Just Having Fun: Richard said, "I wouldn't try to draw conclusions about ISO accuracy from this scene".

It is very possible the lighting was slightly different. The fact is we are only guessing, and do not have all the facts.

I hope you are right.

Direct link | Posted on Mar 16, 2012 at 22:07 UTC
On Just Posted: Olympus OM-D E-M5 test samples article (458 comments in total)

ISO3200:
NEX5n: 1/800, f8
7D: 1/640, f9
E-M5: 1/800 f6.3

ISO200:
NEX5n: 1/50 f8
7D: 1/40 f9
E-M5: 1/50 f6.3
G3: 1/80 f6.3

The difference is consistently 2/3 EV.

real sensitivity of E-M5 at ISO200 = ISO125 on 7D, NEX5n, G3
real sensitivity of E-M5 at ISO3200 = ISO2000 on 7D, NEX5n

Direct link | Posted on Mar 16, 2012 at 21:36 UTC as 91st comment | 10 replies
On Preview: Canon PowerShot G1 X large sensor zoom compact article (776 comments in total)
In reply to:

manmachine242: "Sensor size: Four Thirds (18.7 x 14 mm)"

I think "Four Thirds" is a typo.

Thank you!

Direct link | Posted on Jan 9, 2012 at 16:38 UTC
Total: 24, showing: 1 – 20
« First‹ Previous12Next ›Last »