rhlpetrus

rhlpetrus

Lives in Brazil Campinas, Brazil
Works as a math professor
Joined on May 4, 2007

Comments

Total: 601, showing: 1 – 20
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If the optics are decent, interesting alternative, even for APS-C (Nikon DX).

Direct link | Posted on Jan 24, 2015 at 22:46 UTC as 13th comment | 1 reply
On Nikon D750 flare investigated: Why we're not worried article (358 comments in total)
In reply to:

DDWD10: If I could just play Devil's Advocate for a second.

Both the stepped flare and AF calibration issues would be impossible in a MILC. More complicated machines increase the likelihood of quality control issues. Glad to see Nikon is stepping up to the plate and taking care of this.

"The only camera makers not having new issues are those who don't produce new products."

Or those that sell so little that there are no users available to test cameras.

Direct link | Posted on Jan 21, 2015 at 20:20 UTC
On Nikon D750 flare investigated: Why we're not worried article (358 comments in total)
In reply to:

Ramjager: Let me guess if it was a Canon camera from DPR's perspective it would be another nail in the coffin.
Instead it's Nikon but hey it's ok...
Let me guess who is paying the bills..

Oh my, more conspiracy going on ...

Direct link | Posted on Jan 21, 2015 at 20:17 UTC
On Nikon D750 flare investigated: Why we're not worried article (358 comments in total)
In reply to:

Artpt: Directed @Rishi, do you think manufacturers will get sophisticated enough to have camera bodies fine tune their PDAF with various lens using the CDAF in camera...much like manual white balance with indoor lighting?

I rough comparison is a printer's/scanner's calibration process...

Just a thought?...and as always, thanks.

Art

The latter cameras from Nikon and Canon seem to require less AF microtuning with newer lenses, so maybe this is already going on, maybe not a full-fledged tuning, but some sort of generic FT.

Direct link | Posted on Jan 21, 2015 at 20:16 UTC
On Nikon D750 flare investigated: Why we're not worried article (358 comments in total)
In reply to:

AbrasiveReducer: Say you were working for a small company and not getting the publicity you felt was deserved...Instead of spending tons of money on pure photography, leave a screw out somewhere and your product will be in the news every day for months. All for a problem that is easily fixed. And between shows, too when there is no other news.

Paranoid and conspiratorial minds abound around the internet.

Direct link | Posted on Jan 21, 2015 at 20:12 UTC
On Nikon D750 flare investigated: Why we're not worried article (358 comments in total)
In reply to:

Eleson: "Much of the talk on the internet since the launch of the D750 has been about flare, "
I would disagree. At least equal much talk have been about how Nikon would handle this (non-) issue.
The track record with Oil and left side AF has been the reason for this.
- And the handling on this matter from Nikon have been 2nd to none and a really good statement in customer care.

Totally agree, from the start, after seeing how many othe rbodies showed the same effect, I felt this was an overblown internet affair. Nikon, scolded for their unproper handling of D600 issue, mainly, responded in a way I find a bit unexpected. Good for us Nikon users, actually, so I don´t condemn the whistle-blowers, even those with some paranoid tendencies.

Direct link | Posted on Jan 21, 2015 at 20:10 UTC
On Nikon D750 Review preview (1838 comments in total)
In reply to:

Horshack: Very nice follow-up on the flare issue Rishi. Ever since you started contributing to the editorial content on the site the depth of technical information has increased markedly. I just wanted to say thanks and to let you know your contribution hasn't gone unnoticed.

Indeed, KUTGJ! Hi Phil!

Direct link | Posted on Jan 21, 2015 at 11:32 UTC
In reply to:

sfpeter: My 750 is in the affected range, and after some trial and error I've been able to reproduce it. Use a wide open prime, in my case a 50mm f/1.4, in live view. Point a bright light source at the lens from high up and gradually move it down. At about a 45 degree angle, give or take 2-3 degrees, it will appear. You're basically pointing it right at the AF sensor.

How big this is depends on the type of shooting you do--and as been repeated ad nauseum, it's not flare but an internal reflection off the AF sensor, and in a very limited 2-3 degree range. The "dark band" would be completely black if something was blocking it.

If I shot video all the time and used flare this would be an issue, I'm not sure if this is important enough for me to bother--I haven't seen it any actual photos I've taken.

Unless you are like me and, when updating, keep cameras as collecting items, I'd do it. It'll affect its resale value.

Direct link | Posted on Jan 20, 2015 at 15:29 UTC
In reply to:

Just a Photographer: Expect the D760 to be announced At CP+...

@Just: selling your Nikon gear and going with another brand will only change the destination of your frustration, believe me. I have used Pentax, Leica, Samsung, Canon and mostly Nikon (and now a compact Leica again). I'd say Nikon does relatively well, maybe with the exception of the D600's dust/oil issue, that was really mismanaged. The way they have dealt with this latest case (750) shows they are have become much more attentive and responsive to problems in cameras.

Direct link | Posted on Jan 20, 2015 at 15:27 UTC
In reply to:

JRFlorendo: This is a SLAM DUNK class action law suit, an engineering flaw by Nikon engineers, can't get any easier than that. Nikon just needs to slow down, it seem like they are coming out with a new FF camera every six months, at that rate, something is bound to get neglected. Sony and Toshiba already providing you with top grade sensors, slooow down and get the engineering and quality control right.

You need to learn the facts, not an engineering flaw, and also present in many other models/brands.

Direct link | Posted on Jan 20, 2015 at 15:22 UTC
On Panasonic Lumix DMC-LX100 Review preview (876 comments in total)

Looks excellent overall, plan is to get the Leica version. Thanks for good review. Repositioning AF point is mostly an issue when using a tripod, for most other uses, focus and reframe is much quicker.

Direct link | Posted on Nov 18, 2014 at 21:47 UTC as 194th comment | 1 reply
On A second glance: two takes on the Leica X article (391 comments in total)
In reply to:

ekaton: I`m not trying to defend the X113. But the professional`s "review" is rather a piece of snobbery than a real camera review. If he can`t get a decent file with a state of the art 16MP aps-c sensor than it might be not the tool`s shortcomings. This 16MP Sony sensor is as good as FF sensors were a few years back. Good enough, for sure for many pro uses. "Inadequate DNG files....". Really?

Not true, there are very evident differences between sensors/adc systems, and some are clearly better than others. Pushing shadows is something that shows limitations of some very expensive pro-level sysyems, and this Leica just seems handicapped in that regard.

Direct link | Posted on Nov 8, 2014 at 00:26 UTC
On Panasonic Lumix DMC-LX100 First Impressions Review preview (1864 comments in total)
In reply to:

Mike Ronesia: How is the macro mode on this camera? It could be perfect for an underwater housing.

0.089 ft is 2.7cm

Direct link | Posted on Oct 29, 2014 at 23:29 UTC
On Canon EOS 7D Mark II First Impressions Review preview (2702 comments in total)
In reply to:

Yiannis A - Greece: Dear friends, spending the last 75 minutes reading all comments on this page, i have to say that, most opinions remind me of a hypothetical scenario that Monica Bellucci (not a fan of her but most men are) offers you her entity for one night and Roseanne Barr hers (nothing personal dear Rosie) for a fraction of the price. Finally, short of cash/self-confidence/mentality, you decide to try your luck with the "not so obvious choice". You'll never admit that you did it due to the aforementioned reasons, instead you'll go on shouting "Dear Lord, what was it i was about to pay almost a fortune for? A woman with a left ear 1/10th of a millimeter smaller than her right one! Thank you my Lord for leading me towards the symmetrical perfection of Roseannes' ears! I'm so so happy, i chose her!" With what i say here, i don't want to insult certain stars/fans/people but to give an example of what kind of excuses people use in order to persuade others for their own opinions, biases and obsessions.

You have a lot of time to spend ...

Direct link | Posted on Oct 24, 2014 at 18:46 UTC
On Canon EOS 7D Mark II First Impressions Review preview (2702 comments in total)
In reply to:

PhotoKhan: When we initially access the comparison it is set up to show Jpeg samples of the 7DII on the top left pane, the 7D on the top right, the Nikon 7100 on the lower left and the Sony a6000 on the lower right pane.

When we switch to RAW, no mater in what particular area of the scene you click the sampler over it is extremely clear that the Sony is far superior to the other 3.

The issue with A6000 in Raw is color, check hair, it shows a greenish cast, color card shows signs of color shifts in any part that has strong reds. Detail is excellent, D7100 is next, D7100 looks better re colors. The Canons suffer in detail, and colors are a bit too saturated, but that's likely due to ACR's profiles.

Direct link | Posted on Oct 24, 2014 at 18:44 UTC
In reply to:

falconeyes: Still largely useless tool. Ok for noise and corner performance. Nothing else.
E.g., uses F5.6 70mm eq. for RX100m3 and F4 50mm eq. fir LX100. Can't be compared. E.g., F5.6 is F15.4 eq. and deep into softness by diffraction territory.

Rishi, how did you convert LX100's files? Is ACR updated for it? I thought not.

LX100 looks like a winner. Some have complained about lens wide open, in the longer review, please check that, since one of its most interesting features is the fast zoom.

Direct link | Posted on Oct 15, 2014 at 14:00 UTC
In reply to:

Eric Calabros: Forget these compacts, look at that almighty D750
downscaled to print size, competes with A7S!

I'm getting both, the D750 and the Leica D-Lux 109 (=LX100)

:-)

Direct link | Posted on Oct 15, 2014 at 13:57 UTC
In reply to:

intruder61: Too many guys believe the BS hype the manufacturers are throwing at you about how good these compacts are, then when they don't perform to what you want it to, out come the guns....compacts are compacts are compacts, small sensors, nothing special, it is what it is....and here is the special, you get shafted by paying premium price....entry level DSLRs with APSC sensors for less $$ are a whole lot better value...oh yeah i forgot, the DSLRs dont fit in your back pocket while you're having coffee down at the cafe.

I am getting the V-Lux (same as LX100), to go along with the dlsr system, which I can keep at a higher level (FF, for example), for more difficult or more requiring shooting situations. A compact this size is very handy, when you don't need all the capability of a dslr. Compare the LX100 size and bulk to even a small dslr or ml, when lenses are included (and kit zooms tend to be very slow, if you want a faster zoom, size, weight and price climb very fast).

Direct link | Posted on Oct 15, 2014 at 13:56 UTC
In reply to:

Artpt: @Rishi Sanyal:

Way to respond... to a lot 'passionate' questions (I am thinking of Rodney Dangerfield in Back To School..."He really seems to care. About what, I have no idea")

Anyway, does noise relate to color channel...or are they all independent and more a characteristic of each sensor?

As always, thank you!

Color channel noise depends heavily on light source. Incandescent lighting, for example, has very weak B channel, which will cause WB correction to bring up a lot of noise in that channel. That's why we see two cameras having pretty similar noise when the light source has balanced colors, but one of them suffering of much more noise when channels are unbalanced, in low light situations.

Direct link | Posted on Oct 15, 2014 at 13:52 UTC

Very nice performance from LX100, I'll be getting the Leica version, likely same. How did you convert its RAW files? I have checked the latest ACR update and the LX100 is not included. Am I missing something?

Direct link | Posted on Oct 15, 2014 at 13:48 UTC as 33rd comment | 1 reply
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