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: 202, showing: 81 – 100
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On article #1 in France: Hands-on with DxO ONE (278 comments in total)

Why do we need another camera in a smart phone?

Link | Posted on Aug 12, 2015 at 02:20 UTC as 36th comment
In reply to:

Fri13: 1:1 reproduction ratio is the requirement for "Macro". But with this 15mm for 36x24mm sensor it would really require to be far more closer than 12cm from the front element, more like a 3-4cm maybe? But how if the front lens is already wider than the 36x24mm, how can you get it to be 1:1?

See the specification at the website:

Min. focusing distance
(Subject to Sensor) 12 cm (no 1:1 affirmed)

Min. working distance

(Subject to Front Element) 0.47 cm (1:1)

So, it seems clear, that 1:1 ratio only at 0.47 cm distance (where comes the light from?) from the front element, and the 12 cm minimum focusing distance refer to sensor plane. Sensor plane to camera front thread + lens length + 0.47cm = 12cm? Probably!

Link | Posted on Jun 24, 2015 at 23:16 UTC
On article Manfrotto launches miniature Lumie LED lights (49 comments in total)

Forget. Only for too close.

Link | Posted on Mar 27, 2015 at 02:23 UTC as 13th comment
On GalleryItem:3164195 (9 comments in total)
In reply to:

matthew saville: How is THIS an acceptable sample photo? It's completely out of focus! Are there any other 11mm f/4 shots that actually have useful corner sharpness sampling?

Out of focus???

Posted on Mar 19, 2015 at 17:11 UTC
In reply to:

Ruy Penalva: Forget both. Think on Canon 11-24 the Beast. But the price matter.

So do you think Canon went to 11mm wide without no need?!!! See its MTF done by Roger Cicala and change your concept. Soon Sigma will be there too. That lens quality aims at 50 MP sensor.

http://www.lensrentals.com/blog/2015/02/canon-11-24-f4-l-mtf-tests

Link | Posted on Mar 6, 2015 at 22:36 UTC
In reply to:

Ruy Penalva: Forget both. Think on Canon 11-24 the Beast. But the price matter.

To Panorama f/2.8 is not important. F/4 suffices indoor in wide angle in most situations.

Link | Posted on Mar 6, 2015 at 15:11 UTC

Forget both. Think on Canon 11-24 the Beast. But the price matter.

Link | Posted on Mar 6, 2015 at 03:22 UTC as 82nd comment | 5 replies
On article Panasonic Lumix DMC-GH4 Review (490 comments in total)

I think, besides the poor lens inventory, it is not a camera for serious still shooters.

Link | Posted on Oct 17, 2014 at 01:45 UTC as 70th comment | 14 replies

I'm hoping for the impossible. Canon promised. Canon should make it possible.

Link | Posted on Oct 7, 2014 at 16:28 UTC as 395th comment

May be this new model can focus better than the old one. I had the old one and almost all of my shot (telephotos) were under-focused when 100% amplified.

Link | Posted on Sep 22, 2014 at 21:52 UTC as 112th comment | 2 replies
On article Sony unveils FE PZ 28-135mm F4 G OSS cinema lens (120 comments in total)

Astonishing 95mm frontal filter thread!!! Hood like a camcorder hood. A complete lens.

Link | Posted on Sep 13, 2014 at 00:48 UTC as 12th comment
On article Sony unveils FE PZ 28-135mm F4 G OSS cinema lens (120 comments in total)

That is a lens. Has the best of the World, and has AF and IS, besides having focus, zoom and aperture ring, Congratulations Sony! I forgot: Powered zoom.

Link | Posted on Sep 12, 2014 at 22:40 UTC as 13th comment
On article Zeiss introduces 'no distortion' Otus 1.4/85mm (340 comments in total)

85mm lens, even so fast, without stabilization, is a invite to hand photo blur.

Link | Posted on Sep 9, 2014 at 01:13 UTC as 106th comment | 4 replies
On article Zeiss launches Loxia full frame lenses for Sony E-mount (269 comments in total)
In reply to:

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

I prefer to have all options available in my camera lenses. But if they were made to use follow focus and aimed at the cinema (very small public) user, I understand.

Link | Posted on Sep 4, 2014 at 01:00 UTC
On article Zeiss launches Loxia full frame lenses for Sony E-mount (269 comments in total)
In reply to:

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

All Canon top cinema lens have AF. It is easier and cheap to make MF lens than AF one. See Samyang.

Link | Posted on Sep 3, 2014 at 22:31 UTC
On article Canon confirms price drop on select EF lenses (139 comments in total)

Deceive me! I like it.

Link | Posted on Sep 3, 2014 at 19:14 UTC as 8th comment
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
Total: 202, showing: 81 – 100
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