Twong

Lives in United States OH, United States
Joined on Sep 21, 2006

Comments

Total: 51, showing: 1 – 20
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On article Sigma sd Quattro H real world samples gallery (108 comments in total)

Excellent sample images! Very natural looking. Very much like to see comparison with Pentax Pixel Shift technology.

Link | Posted on Apr 10, 2017 at 16:45 UTC as 8th comment
In reply to:

Twong: Polishing lens elements by hand, that must be for show only. There is no way to achieve high degree of reproducibility. Skilled professionals definitely exist, but not for this purpose, I hope.

You are so upset that you could not even type - "wth do you think "even with the LARGE astro mirrors ... " means?" How sad, I hope English is not your first language, which can explain a lot of your replies.

The word "large" has no absolute meaning, it is relative. You talk like a toddler. You need to go back to may be grade school to relearn the basic language skill.

Link | Posted on Mar 30, 2017 at 00:56 UTC
In reply to:

Twong: Polishing lens elements by hand, that must be for show only. There is no way to achieve high degree of reproducibility. Skilled professionals definitely exist, but not for this purpose, I hope.

No, I did not. That is exactly what you said. You may have missed something out without realizing it, but that is your problem. You did not mention what is large or small mirror in your previous reply.

Get a grip dude, like you said. If you have not learned the basics of logic, time to learn something. Don't get too upset, it has been fun. Have a good day.

Link | Posted on Mar 29, 2017 at 01:31 UTC
In reply to:

Twong: Polishing lens elements by hand, that must be for show only. There is no way to achieve high degree of reproducibility. Skilled professionals definitely exist, but not for this purpose, I hope.

@rrccad, you also contradicted yourself in one of your replies

"actually polishing astro mirrors is all done by hand .... astro mirrors which are usually done by machine"

Make up your mind if it is done by hand or machine. Or may be you are one of those management type who treats workers as machines.

Link | Posted on Mar 28, 2017 at 18:42 UTC
In reply to:

Twong: Polishing lens elements by hand, that must be for show only. There is no way to achieve high degree of reproducibility. Skilled professionals definitely exist, but not for this purpose, I hope.

@rrccad, you finally understood, what took you so long. You made assumptions that you could not substantiate. Now, you retreated to saying that I read too much into it. It is not there and it is not there. Case closed. You want to believe and so you accept blindly.

Link | Posted on Mar 28, 2017 at 16:29 UTC
In reply to:

Twong: Polishing lens elements by hand, that must be for show only. There is no way to achieve high degree of reproducibility. Skilled professionals definitely exist, but not for this purpose, I hope.

@rrccad, you are correct to say "grinding, alignment and pressure based upon interferometer results". But the report said "Master Craftsmen (or 'Takumi') can tell when to apply more or less pressure by feel alone" with no mention of instrument measurement, placing experience above instrumentation and suggesting experience is superior. Similar tactic is used in chocolate commercial that the chocolate master slowly pouring melted chocolate into a mold.

You failed to see this subtlety, but that is common human behavior. Our brains will fill in the gap of missing information as if they are there but they really are not. This is a common tactic in advertising.

Link | Posted on Mar 28, 2017 at 12:50 UTC
In reply to:

Twong: Polishing lens elements by hand, that must be for show only. There is no way to achieve high degree of reproducibility. Skilled professionals definitely exist, but not for this purpose, I hope.

Thank you, vscd. I know it can be done with proper measurement. But the report said this on slide #12:

"With decades' of experience, Master Craftsmen (or 'Takumi') can tell when to apply more or less pressure by feel alone. Some processes, like this one, are considered so critical that they must be performed by hand."

Do you see my point now? I believe DPR reported as is, but then one can only come to a less than comfortable conclusion, at least for Canon faithful.

Link | Posted on Mar 28, 2017 at 01:56 UTC
In reply to:

Twong: Polishing lens elements by hand, that must be for show only. There is no way to achieve high degree of reproducibility. Skilled professionals definitely exist, but not for this purpose, I hope.

I can see you just want to win the argument but with no facts to back you up except to claim that you know something.

Quote from slide 6: " Canon claims a tolerance of +/-30 nanometers." Do you even know what nanometer is? 30 nanometers equal to 3.0e-6 cm or 1.18e-6 inches. And you can feel that? Either you are nano guy or have no idea what you are talking about.

And you definitely have no idea what marketing will do to impress the public, especially uninformed public.

Link | Posted on Mar 27, 2017 at 22:24 UTC
In reply to:

Twong: Polishing lens elements by hand, that must be for show only. There is no way to achieve high degree of reproducibility. Skilled professionals definitely exist, but not for this purpose, I hope.

No problem, but you know no one can use "feel" to measure that level of precision. Anyone buying into that has no ability to discern facts from fiction.

Link | Posted on Mar 27, 2017 at 00:22 UTC
In reply to:

Twong: Polishing lens elements by hand, that must be for show only. There is no way to achieve high degree of reproducibility. Skilled professionals definitely exist, but not for this purpose, I hope.

I can see many of you implicitly believe that handcraft is better, there is no solid proof of that. Many companies are tapping into this baseless but emotional argument to justify the high prices. Let me quote from the report:

"With decades' of experience, Master Craftsmen (or 'Takumi') can tell when to apply more or less pressure by feel alone. Some processes, like this one, are considered so critical that they must be performed by hand."

He can tell differences in nanometer scale by feel alone? It must be an alternative universe he is living in.

Link | Posted on Mar 26, 2017 at 21:30 UTC
In reply to:

Twong: Polishing lens elements by hand, that must be for show only. There is no way to achieve high degree of reproducibility. Skilled professionals definitely exist, but not for this purpose, I hope.

For one off items, no point in building a machine. Doing it by hand does not guarantee quality, it needs machine measurement to know if it meets specifications. That measurement cannot be done by feeling as suggested in the report, no matter how well trained. The whole thing is a show that is part of Canon ad campaign.

Link | Posted on Mar 26, 2017 at 02:30 UTC
In reply to:

Twong: Polishing lens elements by hand, that must be for show only. There is no way to achieve high degree of reproducibility. Skilled professionals definitely exist, but not for this purpose, I hope.

You can of course choose what to believe. It is not DPR misleading you, DPR did a fine job. I did not question DPR integrity in this report; you have misread my comment. It is Canon that is doing the dog and pony show. Canon for sure loves faithful consumer who does not question or has no ability to question. Pay more and they will have more hand crafted lenses at huge profit margins.

Link | Posted on Mar 21, 2017 at 14:58 UTC
In reply to:

Twong: Polishing lens elements by hand, that must be for show only. There is no way to achieve high degree of reproducibility. Skilled professionals definitely exist, but not for this purpose, I hope.

I do know quite a bit about industrial processes. High precision is something I am familiar with. If you still believe the story, you have your head in the sand.

Link | Posted on Mar 20, 2017 at 23:05 UTC

Polishing lens elements by hand, that must be for show only. There is no way to achieve high degree of reproducibility. Skilled professionals definitely exist, but not for this purpose, I hope.

Link | Posted on Mar 20, 2017 at 14:48 UTC as 100th comment | 27 replies

When it was first announced, I thought the 4/3 system with a whole new lens mount was a bad idea. It still is. However, I bought into the m43 system though. It is not my main system but I just bought another m32 lens for an upcoming trip. The size of the entire system was the primary driving force. APS-C can be too big for certain situations. FF is just plainly too big. OTOH, MF is now getting my attention for ultimate IQ.

Link | Posted on Mar 11, 2017 at 21:30 UTC as 43rd comment
On article Leica SL gallery update (217 comments in total)

The photo above shows think-skin onion around out of focus highlight which is very disturbing imo.

Link | Posted on Feb 18, 2017 at 13:45 UTC as 10th comment | 1 reply

Looking at pictures of static objects like buildings, the quality is rather mediocre. They are in focus but the resolution seems low for 24MP images. Some of the pictures are overexposed for my taste. I suspect that these pictures were taken hand held. If that is the case, a tripod will definitely improve the quality.

Link | Posted on Feb 2, 2017 at 13:23 UTC as 33rd comment
On article Hands-on with Ricoh's compact Pentax KP (634 comments in total)
In reply to:

Richard Murdey: I just realized: no top LCD.

I don't care what the price is or the features are. No top LCD, you sit at the kid's table. Your credentials as a top tier enthusiast dSLR are revoked.

The top LCD is totally useless. This is a good move imo.

Link | Posted on Jan 26, 2017 at 02:01 UTC
On article Leica M10 real-world sample gallery (345 comments in total)
In reply to:

MikeF4Black: Nice images. I suppose the doubles are intended to show what can be done with the files. Brightening an image shot in near darkness (subway shot f.i.) doesn't really make it better though.

So.... in what way are these better than what a 750 with same fl lens would have produced?

A rangefinder does demand a lot more - guess a lot more and still not quite right.

Link | Posted on Jan 23, 2017 at 01:41 UTC
On article Leica M10 real-world sample gallery (345 comments in total)
In reply to:

MikeF4Black: Nice images. I suppose the doubles are intended to show what can be done with the files. Brightening an image shot in near darkness (subway shot f.i.) doesn't really make it better though.

So.... in what way are these better than what a 750 with same fl lens would have produced?

I have indeed shot rangefinder (& TLR) a long time ago. I would not let my nostalgic to take control because I cannot hang that on a wall. There is nothing in rangefinder that SLR cannot do except parallax error.

Link | Posted on Jan 23, 2017 at 01:38 UTC
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