Ruy Penalva

Ruy Penalva

Lives in Brazil Lauro de Freitas Bahia, Brazil
Works as a Medical Doctor
Joined on Jun 28, 2010
About me:

Ruy Penalva de Faria Neto

Comments

Total: 166, showing: 61 – 80
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On article Zeiss launches Loxia full frame lenses for Sony E-mount (269 comments in total)

I don't understand why Zeiss insist on doing MF lens. Wake up Zeiss!

Link | Posted on Sep 3, 2014 at 19:12 UTC as 29th comment | 8 replies
In reply to:

Ruy Penalva: Avoid. I bought a Mark IV to my a7s, and AF does not function at all. Horrible and amateur support if we can call that of support. A guy named Alex try to deceive you as being an specialist. No way to access adapter function (green & advanced). Pricey.

There is a button in the adapter (maybe what they call wide angle button???) I have already pressed that button in the two ways they teach (see under) but my adapter only choose "advanced mode".

"Choose the other operation mode by first turning on the power of your Sony NEX camera and either attach the Metabones Smart Adapter onto the Sony NEX camera body first, and then while depressing the Wide-Open button of the Smart Adapter, attach the Canon EF mount lens onto the Smart Adapter, or attach the Canon EF mount lens onto the Metabones Smart Adapter first, and then while depressing the Wide-Open button of the Smart Adapter, attach the Smart Adapter onto the Sony NEX camera body."

Thanks

Link | Posted on Sep 2, 2014 at 21:53 UTC
In reply to:

Ruy Penalva: Avoid. I bought a Mark IV to my a7s, and AF does not function at all. Horrible and amateur support if we can call that of support. A guy named Alex try to deceive you as being an specialist. No way to access adapter function (green & advanced). Pricey.

I tested in three lens: EF 24-105 f/4 IS. EF 24-70 f/2.8 II. Sigma 50mm f/1.4 Art as yet. The supposed technician support, named Alex, ( he is also from selling sector) told me that advanced mode does not support AF. It happens that I could not access how to change mode and Metabone states that by default green mode is assumed at beginning. Metabone also states that when you assemble the lens and the adapter, and turn the camera on, you are asked to choose between green or advanced mode. No message appeared to me so far. The adapter is supposedly using advance mode since there is constant control of aperture (visually seen) and image stabilization (heard). I think there is a flaw with this Mark IV adapter in Sony a7s camera. They made a firmware in August 14 but it did not fit it. Forget AF in a7s with the adapter and Canon brand lens.

PS. In my first usage AF appeared but disappeared mysteriously to never more come back again.

Link | Posted on Aug 29, 2014 at 22:48 UTC

Avoid. I bought a Mark IV to my a7s, and AF does not function at all. Horrible and amateur support if we can call that of support. A guy named Alex try to deceive you as being an specialist. No way to access adapter function (green & advanced). Pricey.

Link | Posted on Aug 29, 2014 at 19:30 UTC as 17th comment | 4 replies

I hate Corel. Horrible.

Link | Posted on Aug 29, 2014 at 02:32 UTC as 30th comment
On article What is equivalence and why should I care? (2177 comments in total)

Butler. My question. It is told that f/8 is the optimum limit to diffraction in digital sensor. My question to you is: The shift in aperture equivalence is followed by a decrease in diffraction too? In other words. Take a Panasonic lens with an upper f/5.6 aperture. The equivalent aperture of that lens would be f/11.2. How that real aperture of f/5.6 (or 11.2 equivalent) behaves in regard to diffraction? Is diffraction related to amount or to intensity of light?

Link | Posted on Jul 9, 2014 at 03:04 UTC as 227th comment | 5 replies
On article Tamron SP 150-600mm F/5-6.3 Di VC USD Lab Test Review (266 comments in total)

Resuming: A good trash.

Link | Posted on Jun 26, 2014 at 01:54 UTC as 78th comment
In reply to:

Ruy Penalva: Tamron knows Panasonic will launch sensor stabilization

The shift of Tamron toward a non stabilized zoom lens is a clue to that rumor

Link | Posted on Jun 20, 2014 at 01:28 UTC
In reply to:

Ruy Penalva: Tamron knows Panasonic will launch sensor stabilization

Probably will adopt it universally in all MFT, I mean.

Link | Posted on Jun 19, 2014 at 21:37 UTC

Tamron knows Panasonic will launch sensor stabilization

Link | Posted on Jun 19, 2014 at 16:36 UTC as 28th comment | 4 replies
In reply to:

Shadowww: For those who are curious about focal length/aperture equivalents yet are too lazy to calculate: it's 88-320mm f/7.2-10 equivalent.

I think this concept of aperture equivalence should be discussed better from an optical point of view. Although focal equivalence is obvious in magnification, we don't feel that huge lack of light in cropped sensors as compared to 35mm sensor. As we know f/8.0 is the upper limit of optimal refraction in digital sensor, every cropped sensor would give poor results. And that is not the case. May be that is true only in terms of DoF but not in the amount of light that reach the photo-sites.

Link | Posted on Jun 17, 2014 at 21:53 UTC

Pure lol.

Link | Posted on Jun 13, 2014 at 19:30 UTC as 29th comment
On article Sigma 50mm F1.4 DG HSM review (592 comments in total)

The price of the lens in Side by Side comparison is wrong.

Link | Posted on Apr 17, 2014 at 15:40 UTC as 185th comment
In reply to:

Lan: In other news, Sony also announced Europe falling off the face of the planet ;)

What about 50p?

I think it can both NTSC and PAL along with 24P. It is described in Sony hot-site.

The sensor reads out image data from every pixel, even during Full HD and 4K*2 movie output, and enables recording and output of Full HD movies at 60p (50p), 60i (50i), 30p (25p) and 24p frame rates, as well as output of 4K movies at a 30p or 24p frame rate, with both resolutions available at both full-frame and APS-C (Super 35mm equivalent) size.

Link | Posted on Apr 7, 2014 at 01:50 UTC

Very practical. Is it a filter or a curtain? Probably Fred of Flintstones will adopt it.

Link | Posted on Jan 24, 2014 at 15:35 UTC as 16th comment
On article Nokia ad takes us inside the new Lumia 1020 (116 comments in total)

It's just time true compact cameras talk like cell phone shoot.

Link | Posted on Aug 12, 2013 at 01:55 UTC as 22nd comment

What about its video capability?

Link | Posted on Jul 17, 2013 at 00:26 UTC as 22nd comment
On article French student creates SLR using 3D printer (156 comments in total)

I do better carving wood.

Link | Posted on Jul 8, 2013 at 21:34 UTC as 58th comment | 1 reply
In reply to:

Ruy Penalva: The built quality cannot be very good since some inner glasses are fixed with glue as shown by Roger Cicala. This could means easy dis-adjustment.

I ask my self how DP could speak of good built quality when DP did know of these pitfalls in built construction such as - industrial Josh152's glue - use in front elements?

Additionally, how DP could talk about the good environmental seal with only few hours of testing?

Where are the tests made to show good built and environmental qualities?

Link | Posted on May 21, 2013 at 00:47 UTC

The built quality cannot be very good since some inner glasses are fixed with glue as shown by Roger Cicala. This could means easy dis-adjustment.

Link | Posted on May 20, 2013 at 21:56 UTC as 33rd comment | 5 replies
Total: 166, showing: 61 – 80
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