igor_s

Lives in Ukraine Ukraine
Joined on May 2, 2006

Comments

Total: 80, showing: 1 – 20
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In reply to:

igor_s: I can not see how the RX10 can replace a vast amount of camera/lens combos. The D5500 and 18-135 combo, I guess, is better in every other respect except dimensions and weight. It may be not that reliable PD-focusing with very fast lenses but (1) it has the AF microadjust and (2) you do not have any fast option on the RX10 (jnly F8 in FF terms).

Yes I was wrong at that but everything else applies. If you need you can have the AF adjusted for every lens at a service center.

Link | Posted on Sep 27, 2015 at 23:14 UTC
On article Sony Alpha 7R II Review (2155 comments in total)
In reply to:

igor_s: I do not think that the FF video mode has any advantage in high ISO performance b/c of pixel binning.

Explain.

Link | Posted on Sep 26, 2015 at 22:08 UTC
On article Sony Alpha 7R II Review (2155 comments in total)

May I ask how you get from a full-sized image to the print-sized one? That must have been described elsewhere but I coulld not find the link quickly. Thanks.

Link | Posted on Sep 25, 2015 at 21:43 UTC as 382nd comment
On article Sony Alpha 7R II Review (2155 comments in total)

I do not think that the FF video mode has any advantage in high ISO performance b/c of pixel binning.

Link | Posted on Sep 25, 2015 at 21:30 UTC as 384th comment | 3 replies

I can not see how the RX10 can replace a vast amount of camera/lens combos. The D5500 and 18-135 combo, I guess, is better in every other respect except dimensions and weight. It may be not that reliable PD-focusing with very fast lenses but (1) it has the AF microadjust and (2) you do not have any fast option on the RX10 (jnly F8 in FF terms).

Link | Posted on Sep 20, 2015 at 16:20 UTC as 13th comment | 2 replies
On article Sony Alpha 7R II: Real-world ISO invariance study (369 comments in total)
In reply to:

igor_s: Jiom Kasson showed that the A7RII ISO-invariance holds in the range 640-12K ISO, and it breaks at lower ISOs.
Here we see that the images below ISO 800 get progressively noisier which is in agreement with above.

@Slaginfected

Agree. I think that the invariance should hold also in the range ISO 100 to 500, it just jumps at a different level at ISO 640. In that case the shots at ISO 100, 200 and 400 should have had equal noise level. However, let us remember that the image at ISO 200 was pushed up by 5 stops and at ISO 100 by 6 stops. Perhaps that is simply too much (too low signal to quantify properly, made worse by the lossy compression).

Link | Posted on Aug 25, 2015 at 22:38 UTC
On article Sony Alpha 7R II: Real-world ISO invariance study (369 comments in total)

Jiom Kasson showed that the A7RII ISO-invariance holds in the range 640-12K ISO, and it breaks at lower ISOs.
Here we see that the images below ISO 800 get progressively noisier which is in agreement with above.

Link | Posted on Aug 24, 2015 at 17:02 UTC as 92nd comment | 4 replies
In reply to:

Francis Carver: It would have been useful if the announcement stated whether this lens will be covering APS-C image circle and APS-C form factor sensors, or will it be covering full-frame 135 image circle and FF sensors, i.e. what the heck will it be covering in the first place?

Well, I should have said, be happy)).

Link | Posted on Jul 25, 2015 at 17:00 UTC
In reply to:

Francis Carver: It would have been useful if the announcement stated whether this lens will be covering APS-C image circle and APS-C form factor sensors, or will it be covering full-frame 135 image circle and FF sensors, i.e. what the heck will it be covering in the first place?

My commizerations about the US stores)). Could you order one from BHP or Adorama and return it if you would? I see, that must be too expensive:::. You won't believe but I did not pay anything for the delivery and return (yes, that is rare even here...). So buy a Zeiss, they quote all nesessary parameters. Good luck.

Link | Posted on Jul 24, 2015 at 19:42 UTC
In reply to:

Francis Carver: It would have been useful if the announcement stated whether this lens will be covering APS-C image circle and APS-C form factor sensors, or will it be covering full-frame 135 image circle and FF sensors, i.e. what the heck will it be covering in the first place?

I live in Ukraine, and have tested the lenses (F/1.4 and T/1.5) -one from my local store and another obtained from a Ukrainian Internet shop. Did not buy any yet, b/c did not choose my next camera. I guess if the lenses are easily available here they should be in most countries.

Concerning your question, I just defended the lens (and the company if you wish) from your inadequate in my view attacks. So much fuss for so little sense. BTW, you could ask people on this Forum to tell you the focus throw in degrees, couldn't you? But you did not do that. So I can ask you the same question in the opposite sense.

Link | Posted on Jul 22, 2015 at 08:42 UTC
In reply to:

Francis Carver: It would have been useful if the announcement stated whether this lens will be covering APS-C image circle and APS-C form factor sensors, or will it be covering full-frame 135 image circle and FF sensors, i.e. what the heck will it be covering in the first place?

@Francis: "they should know that themselves". What if they don't? IMO that someone does not need any Canon-mount lenses is not a subject. At most it would be enough to say that once w/o provocative "heys" and "wows". The latter is equally applicable to the focus throw in degrees that was not quoted by Samyang. [You have several ways to find it out, e.g. going to a local store]. Lassoni asked you to calm down, I agree with him. That's it. No more word from me.

Link | Posted on Jul 19, 2015 at 09:12 UTC
In reply to:

Francis Carver: It would have been useful if the announcement stated whether this lens will be covering APS-C image circle and APS-C form factor sensors, or will it be covering full-frame 135 image circle and FF sensors, i.e. what the heck will it be covering in the first place?

Francis, I am responding just because I am trying to stop your verbal flood. Nobody objects that the Rokinon is inferior to the Otus. Go get the Otus. Now you're saying (again many times) that you do not like Canon. Get Nikon or Sony then. May be it's time to stop flooding? DPR is a respectable site.

Link | Posted on Jul 18, 2015 at 10:57 UTC
In reply to:

Francis Carver: It would have been useful if the announcement stated whether this lens will be covering APS-C image circle and APS-C form factor sensors, or will it be covering full-frame 135 image circle and FF sensors, i.e. what the heck will it be covering in the first place?

Francis, do you think that anyone's interested? Good luck with any lens you want.

Link | Posted on Jul 17, 2015 at 20:45 UTC
In reply to:

Francis Carver: It would have been useful if the announcement stated whether this lens will be covering APS-C image circle and APS-C form factor sensors, or will it be covering full-frame 135 image circle and FF sensors, i.e. what the heck will it be covering in the first place?

@Francis
"Now then -- since I would NEVER buy a Samyang lens, a Rokinon lens, or in fact any other lens in any Canon lens mount configuration"

You may not buy any lens at all:::. Why are you making so much fuss about that?

Link | Posted on Jul 16, 2015 at 16:51 UTC
In reply to:

Francis Carver: It would have been useful if the announcement stated whether this lens will be covering APS-C image circle and APS-C form factor sensors, or will it be covering full-frame 135 image circle and FF sensors, i.e. what the heck will it be covering in the first place?

@Francis: you're speaking like a typical troll. Nothing personal, mate.

Link | Posted on Jul 9, 2015 at 17:25 UTC
In reply to:

Francis Carver: It would have been useful if the announcement stated whether this lens will be covering APS-C image circle and APS-C form factor sensors, or will it be covering full-frame 135 image circle and FF sensors, i.e. what the heck will it be covering in the first place?

Did you read the announcement any further?
"Samyang Optics 100mm T3.1 VDSLR ED UMC MACRO is a macro telephoto manual focus cine lens designed for full frame sensor sizes. "
And you can be sure that the cine lens (the photo lens being internally identical) have a fair focus throw.

Link | Posted on Jul 7, 2015 at 20:22 UTC
On article Analysis: Sony a7R II and RX100 IV autofocus systems (752 comments in total)
In reply to:

ozturert: In continuous AF, the Sony is perfectly focusing on nose :) In the first video 75% of shots ended up on his nose :)
Well, it's still very impressive to autofocus with a Canon lens with a 3rd party adapter. Really impressive. Now we can use the excellent Canon glass with excellent Sony sensor using AF.

@Rishi
I think that Sony has not offered the Eye AF with third party lenses intentionally, as Sony and moreover Zeiss glass is overpriced compared to many other brands.

In fact, I (cynically) think that Sony did the leap in order to make their financical condition not that bad, and they will stop going on as soon as they decide that they are OK. That's just business.

Link | Posted on Jul 3, 2015 at 12:07 UTC
On article Analysis: Sony a7R II and RX100 IV autofocus systems (752 comments in total)

Rishi: "What finally enabled the use of on-sensor phase-detect information to drive adapted DSLR lenses?"

I'd like to see what prevented from that before.

Link | Posted on Jul 2, 2015 at 20:12 UTC as 95th comment
On article Opinion: Did Sony just do the impossible? (1085 comments in total)
In reply to:

The Silver Nemesis: After reading the article:
a) Sony is (definitely) good;
b) Canon is (definitely) bad;
c) Nikon is (somewhat) irrelevant (well, except for that 3D tracking that has the purpose to make Canon look even worse);
d) Ad-hoc market analysts are giving a (generous) helping hand.

If there is a way to gain brand equity (quickly), this article should be a case study in Harvard Business Review.

@Lassoni: Agree. But I would add that technically they offer a little as far as we are speaking about bodies. No top high ISO performance, no top burst or AF speed, no IBIS... Good old style for crazy money. You could attach a Leica lens to another camera and have the same IQ and optionally more.

Link | Posted on Jun 27, 2015 at 17:56 UTC
On article Opinion: Did Sony just do the impossible? (1085 comments in total)
In reply to:

The Silver Nemesis: After reading the article:
a) Sony is (definitely) good;
b) Canon is (definitely) bad;
c) Nikon is (somewhat) irrelevant (well, except for that 3D tracking that has the purpose to make Canon look even worse);
d) Ad-hoc market analysts are giving a (generous) helping hand.

If there is a way to gain brand equity (quickly), this article should be a case study in Harvard Business Review.

Sure Leica do not want to compete with Canon:).

Link | Posted on Jun 27, 2015 at 08:54 UTC
Total: 80, showing: 1 – 20
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