zos xavius

zos xavius

Joined on Aug 23, 2011

Comments

Total: 187, showing: 1 – 20
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In reply to:

SwissRapha: HowaboutRAW, I think you are wrong here. Besides light transmission (T-stop), the lens does not impact the shot noise. How could it?
A better lens can not magically improve the shot noise of the incident light. Similarly, a bad lens (with the same T-stop) does not add shot noise.

BTW, what do you mean with a 'better lens'?

Howaboutraw: Do you even know what tstop is? Two different lenses rarely have identical Tstops. So, one lens is letting in more light than the other one. I have cheap primes with fast tstops that will crush newer, more expensive lenses on speed. What you are saying is fundamentally correct, but do you really know why? I guess myself and the other commenter were looking for you to clarify your statement somewhat. Fstop isn't the same as Tstop. Tstop is the real value of light transmitted. Fstop is determined by a mathematical formula. The two are not the same.

Direct link | Posted on Apr 30, 2015 at 09:35 UTC
In reply to:

SwissRapha: HowaboutRAW, I think you are wrong here. Besides light transmission (T-stop), the lens does not impact the shot noise. How could it?
A better lens can not magically improve the shot noise of the incident light. Similarly, a bad lens (with the same T-stop) does not add shot noise.

BTW, what do you mean with a 'better lens'?

What you are claiming makes no sense. Two different lenses with identical t-stops should produce identical results at the same exposure settings. Prove me wrong.

Direct link | Posted on Apr 29, 2015 at 14:14 UTC
In reply to:

SwissRapha: HowaboutRAW, I think you are wrong here. Besides light transmission (T-stop), the lens does not impact the shot noise. How could it?
A better lens can not magically improve the shot noise of the incident light. Similarly, a bad lens (with the same T-stop) does not add shot noise.

BTW, what do you mean with a 'better lens'?

And you are accounting for the differences in tstop? Tstop is absolute!

Direct link | Posted on Apr 29, 2015 at 13:53 UTC
In reply to:

SwissRapha: HowaboutRAW, I think you are wrong here. Besides light transmission (T-stop), the lens does not impact the shot noise. How could it?
A better lens can not magically improve the shot noise of the incident light. Similarly, a bad lens (with the same T-stop) does not add shot noise.

BTW, what do you mean with a 'better lens'?

The "astounding" difference is merely the difference in tstops. A lens does not increase noise on any way. If they are both transmitting the same amount of light, shot noise will be identical.

Direct link | Posted on Apr 28, 2015 at 15:25 UTC
On Hands-on with the Pentax K-3 II article (555 comments in total)
In reply to:

audiobomber: Hopefully the K-3 II review will be written by Dan Bracaglia and Rishi Sanyal. They did a great job on the A77 II review, especially the focus testing. The K-3 was sabotaged by all the wrong settings for the AF-C test.

Z-axis tracking is weak from my own testing. I don't think its predictive enough coupled with lenses that can be slow to focus. Ricoh knows full well that lens focusing speed is something they need to work on and from what I understand their two newer FF lenses are reasonably fast at focusing. I agree that AF hold does make a difference with tracking and improves it a bit, but turning it on the max should be detrimental to z-axis tracking as the AF is trying to hold at a particular distance. I find the selective mode works best where you select a point for continuous to start from and let it track from there. It is vastly improved over the K-5 IIs for sure, but they have some serious work to do when it comes to tracking. For single shot AF, I find their system more than perfectly adequate and am continually shocked at how it will focus in light that is too dim to even get an adequate image out of.

Direct link | Posted on Apr 24, 2015 at 10:12 UTC
On Hands-on with the Pentax K-3 II article (555 comments in total)
In reply to:

rrccad: okay. so if I'm shooting static scenes. why do I need pixel shifting, since I can usually keep the ISO low, and increase the shutter speed anyways, since you're a) already using tripod (have to for pixel shifting) b) taking images of static scenes.

at least with Olympus - you can see the benefit for product photography, this though outside of reviews .. I'm at a loss to when I'd actually use it and need it.

should be interesting to see all the people in here SCREAMING in mortal agony over the lack of a flash, wifi, articulating screen,etc,etc... especially after all the ranting over the 7DII not having it ;)

@jonathan lee: what makes you think they aren't secretly working on a mirrorless solution? These things don't happen overnight. Clearly they are focusing on the FF and 645 right now. I imagine some kind of innovative mirrorless system is in the works to replace the GXR.

Direct link | Posted on Apr 23, 2015 at 01:41 UTC
On Hands-on with the Pentax K-3 II article (555 comments in total)
In reply to:

rsf3127: this and the 20-40mm 2.8 lens is all I need.

I have one. It is all you need. Unless you need reach at least lol.

Direct link | Posted on Apr 23, 2015 at 01:29 UTC
On Hands-on with the Pentax K-3 II article (555 comments in total)

Thank you for the coverage dpreview!

Direct link | Posted on Apr 23, 2015 at 01:27 UTC as 85th comment

Whoops. Didn't realize these are auto leveling as well. I rescind my previous comment. Wish you could delete things here.

Direct link | Posted on Apr 7, 2015 at 22:23 UTC as 28th comment
On Sony Alpha a7 II Review preview (800 comments in total)
In reply to:

brendon1000: A pretty good review and I agree that I feel the weight of the A7 II is a bit heavy. Was pretty happy with the weight of my A7 which I feel is ideal for a mirrorless camera.

Even I am clueless why Sony went from those lovely dials on the A7 to the crappy ones on the A7 II. Why Sony why ????

One area I don't agree on is the high ISO performance. The low pass filter on the A7 II is pretty weak and your own comparison tool shows that at high ISO the A7 II files are sharper than the D750 and I even downloaded both files to compare and honestly its a tie for me upto ISO 12800.

I shoot with IBIS on all the time on a tripod on a k-3 with a smaller pixel pitch than an a7. It doesn't reduce sharpness on a stable tripod. At least on longer exposures. I've actually used IBIS to to help compensate for long exposures on moving bridges before and it did indeed make a difference. Without IBIS I wasn't able to get one sharp image. With IBIS on and minimal bridge movement I was able to get a pixel sharp exposure after a few attempts.

Direct link | Posted on Apr 3, 2015 at 01:33 UTC
On Fujifilm X100T Review preview (650 comments in total)
In reply to:

aris14: 25 years ago our photographer lost (or it was stolen) all his equipment in the airport along with his travel bag. A motorcycle expo had to be covered for our mag. The only camera left was a compact (Canon or Minolta I can't remember). So editor and photographer went to the press day with that "little monster", did whatever they could and returned with some 20 rolls of film. To our surprise their job was great. We slightly changed our concept of presentation due to lack of some poses we had in mind and the "little monster" could not cope and OK.
What I am saying is that photography in every aspect has traveled a long way since then.

The best camera is always the one that is in your hand.

Direct link | Posted on Mar 28, 2015 at 12:18 UTC
In reply to:

Richard Murdey: And most important of all: why is the accent ring green? I thought the "HD" lenses wore red nowadays ...

Its possible they might still reserve the red rings for limiteds. Their limited line was completely revamped with red rings, so to go back would be kind of silly at this point. The 55-300 has a red ring too. I have one.

Direct link | Posted on Feb 15, 2015 at 14:32 UTC
In reply to:

Mescalamba: Hm.. interesting choice of color for that seal. Exactly same as in Sony lens.

That's funny because it is the same color they have always used long before sony started producing weather sealed lenses.

Direct link | Posted on Feb 15, 2015 at 14:31 UTC
On Canon EOS 5DS / SR First Impressions Review preview (2369 comments in total)
In reply to:

Frank C.: the mighty Sony a9 /w 50M+ sensor will smack the Canon down and all the time and effort would have been for naught, shame really.

@vignes: This camera is going to be of interest to landscape photographers I would imagine primarily. Its hard to deny the power the sony sensors have in their ability to push shadows with very little noise. For night photography this has really transformed what I can capture without all the problems that HDR brings to that sort of long exposure photography. I can underexpose slightly to help preserve highlights and then push the shadows all over the place without any real penalty. At iso 100 I have to go 4 stops before I really get to unusable noise. Even at 400 I have lots of latitude. The real problem is of course highlights. If you can preserve them and push shadows it gives you a lot to work with versus having to choose one or the other. And yeah, ISO 100 is a very practical application for a lot of people. Anyone that does serious landscaping will be at or close to base ISO and on a tripod. DR matters to us.

Direct link | Posted on Feb 10, 2015 at 04:51 UTC
On Canon EOS 5DS / SR First Impressions Review preview (2369 comments in total)
In reply to:

Mssimo: 50mp sensor should need an amazing lens (at around f4 due to diffraction at that pixel size). This sensor will redefine what a L lens should be. My guess is that many lens replacements will be coming. Zeiss otus will pull away from sigma 50mm also. Both of them were close at 36mp, but at 50MP, you will see why the Otus is 4 times more money.

I wish sony would make a full frame sensor based on a scaled up version of the 20MP RX100. Can you imagine a 150MP BSI full frame sensor?

If you are only getting 12mp of detail from f11 on full frame its time to finally upgrade that quantaray. My 24mp aps-c K-3 shows significantly more resolving power at F11 than my 16mp K-5 IIs does. At the very least there are gains to be had in just out resolving a lens anyways. Elimination of moire is one for starters.

Direct link | Posted on Feb 10, 2015 at 01:41 UTC
On Canon EOS 5DS / SR First Impressions Review preview (2369 comments in total)
In reply to:

Frank C.: the mighty Sony a9 /w 50M+ sensor will smack the Canon down and all the time and effort would have been for naught, shame really.

More DR = better images. Some people seem to forget that. I guess they are just used to using ancient sensor technology. Bracket much? ;)

Direct link | Posted on Feb 10, 2015 at 01:32 UTC
On Nikon D750 Review preview (1907 comments in total)
In reply to:

zos xavius: These comments are truly hilarious! My K-3 has stepped flare patterns too. The only time I ever noticed it was in shots already ruined by veiling flare much like all the examples I've seen of the D750 flare "issue." This is so much ado about nothing. BTW, to the people that keep saying canon makes perfect cameras: get a grip.

That's funny because I find no joy really in using Canon gear. I just never really liked their gestalt. The Pentax K-3 and K-5 IIs though just fit like a glove. The have great ergonomics that are a pure pleasure to use. Especially with their grips attached. :)

Direct link | Posted on Jan 23, 2015 at 03:44 UTC
On Nikon D750 Review preview (1907 comments in total)

These comments are truly hilarious! My K-3 has stepped flare patterns too. The only time I ever noticed it was in shots already ruined by veiling flare much like all the examples I've seen of the D750 flare "issue." This is so much ado about nothing. BTW, to the people that keep saying canon makes perfect cameras: get a grip.

Direct link | Posted on Jan 22, 2015 at 11:14 UTC as 124th comment | 2 replies
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.

No. Its not.

Direct link | Posted on Jan 20, 2015 at 14:45 UTC
In reply to:

marc petzold: Dear RICOH, you badly missed the point - we, the Users don't need especially a very slow 18-50mm f/4-5.6 zoom, especially not colappsile - if i need something way handy, i take a DSLM mirrorless anytime with me, over a DSLR, when space is an issue. But a traditional DSLR-styled body, with small lenses, especially F4 starting range....for whom is it made for? Take a NX3000 for instance with the PZ 16-50, and you do have a very nice Zoom Range from 24.5-83mm, starting at F3.5 to F5.6. Or any small NEX 3N to NEX-5N,R,T or A5x00 Series (Alpha) with the matching 16-50/3.5-5.6 PZ (the IQ is worse than the Samsung equivalent).

Furthermore why even bash pentax for producing an entry level body (which I must add blows all the other entry level DSLRs out of the water) and then mention the X-A1 at the same time? Contradictory much? But what do you know or care? You still have a K-100D with a tamron lens. Your so pentaxian you haven't bothered upgrading in 10 years. Yeah. Go enjoy your fuji. Or buy one if you don't have one for all I care. I'm not going to waste my time writing meaningless troll posts about how x-trans is a failure. (though I might have been guilty of that very same thing at one point) BTW, where is Fuji's answer to the 645Z? I think pentax is focusing on high end just fine.

Direct link | Posted on Jan 9, 2015 at 02:19 UTC
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