ﾚﾝｽﾞ沼探検隊ｿﾆｰ沼担当ﾌﾞﾛｸﾞ

2015年5月18日月曜日

おはようございます。
今週の投稿も、αcafeの写真からスタート！
http://bit.ly/1A1JpRX

思わずため息が出るような、藤棚の美しいグラデーション。夢の中にいるみたいですね。

撮影：ウルトラセヴンさん

2015年5月17日日曜日

Mark Galer finds faults in Tony’s Northup “Pixel Density vs Noise” test.

On that Youtube video (Click here) Tony Northrup claims that there is actually almost no noise performance difference on still images between the A7s and D810 (once you downsize the D810 images). Marc Galer spotted some “problems” with Tony’s test:

In response to Tony’s Northup “Pixel Density vs Noise” test.

There are a couple of problems with Tony’s argument. He is basing most of his judgement on a photograph of a white wall at ISO 6,400. The highlights of an image are more of an even playing field. The problematic area for noise in our digital images is to be found in the shadows and not the highlights. The test ISO has been capped at ISO 6,400 and the A7S low-light performance really becomes noticeable when the ISO is raised beyond ISO 6,400. 12,800 is the maximum ISO for the Nikon D810 (without artificially pushing it) and 25,600 is the maximum ISO for the A7m2 and A7R.

I would like to quote Ian Norman from the Lonely Speck website: “The sensor on the a7S is relatively ISOless between ISO 3200 and 51200. This means that for any given shutter speed and aperture setting, changing the ISO between these values shouldn’t change the relative level of noise in the image.”

http://ift.tt/1tpqIlX

This means that the A7S has two full stops more light collecting potential compared to the Nikon D810 for recording information in extremely low levels of ambient illumination, whilst holding onto the same levels of noise that is present in the files produced by the Nikon D810. I am not sure why Tony forget to mention this in his 22-minute video – but I can see why some people would begin to question his motive or expertise in making this assessment. This is a failure to recognise a significant leap in sensor development – and as Tony pointed out, the Video comparison at ISO 51,200 is profound – but Tony dismisses the A7S advantage as ‘in-camera software processing’ – truly bizarre.

Click on image to see the full set of comparisons from Marc Galer.

Here is a link to the gallery of sample images.
http://ift.tt/1Acwqg1

This is a ‘real world’ test. No white wall and ISO values above and beyond the maximum setting cabal by the Nikon D810.
I ‘exposed to the right’ and processed each file using the same settings in Adobe Lightroom. Noise reduction was switched off in camera. White balance was adjusted slightly to render the same colour for the pairs of files and a moderate amount of sharpening and noise reduction applied (+40 & +40).
The A7R stacks up well in these conditions (especially when expositing to the right) but the A7S still shows a clear advantage in additional detail and with less noise when the files from both cameras are exported as 4K files. The A7S still has a stop up its sleeve with noise at 51,200 not climbing above that being recorded at 25,600 although the low light conditions did not require any higher ISO values.

You can also discuss the matter on Mark Galer’s SonyA7 Facebook group:
http://ift.tt/1s6f68B

from sonyalpharumors

A6000 with 500mm & 850mm telephoto (Guest post by Barry Wells).

Kowa TX17 850mm F9.6

The following review is a guest post by Barry Wells. It has been first posted on SonyAlphaForum. Test with the Kowa 500mm (here on eBay) and Kowa 850mm (here on eBay) lenses.

A6000 with 500mm & 850mm telephoto

Three years ago, I switched from a Canon DSLR system to the Sony Mirrorless system. I spent some time looking for a super telephoto lens to replace my Canon 500mm F4 IS which I had been finding too heavy and cumbersome to carry around. Eventually, I purchased the Kowa Telephoto lens. Unusually, you buy the basic lens and then add a 350mm, 500mm or 850mm adapter. I chose TX10 500mm F5.6 adapter to use with my Sony NEX7 body for bird photography.

The Canon lens it replaced weighed 3870 grams, but the Kowa comes in at 2 kilos lighter, at 1970 grams producing a significant weight saving over a conventional DSLR set up. In addition, by removing the lens hood and focal length adapter, the lens measures a mere 250mm (9.8”) in length, making it really practical for travelling.

Kowa TX10 500mm F5.6

The lens unit features dual, manual focus rings, incorporating quick and ultra fine focus options. Used in conjunction with Sony’s superb focus peaking/magnify functions, focussing is quick and accurate. However, being manual focus only, shooting ‘Birds In Flight’ is quite challenging. Featuring fluorite and extra low dispersion lenses, the optical quality is excellent and compares favourably with my old Canon 500mm F4. Build quality is also first rate.

Shot with Kowa TX10 500mm F5.6

I recently added the TX17 850mm F9.6 adapter as I had bought an A7 and found I needed the longer reach with a full frame body. The 850mm is not as sharp as the 500mm but is still quite acceptable – a bit like adding the 1.4x extender to the Canon 500mm, and you do need good light with a F9.6 aperture.

Shot with Kowa TX17 850mm F9.6

Both TX adapters are Sony ‘A’ mount, so you will need a Sony LA-EA3/4 adapter to connect them to the A7 and A6000 bodies.

Obviously without image stabilisation, a tripod is recommended, but not essential. The Meadow Pipit was taken hand held with the 500mm. With a minimum focus of 3 metres, closeups like the Wheatear image are quite possible with the 850mm.

The Kowa will not suit everyone, as manual focussing on moving subjects is a tricky skill to acquire, but the results from this unusual lens are very rewarding.

http://ift.tt/1IJk2FC

Ebay links: Kowa 500mm (Click here) and Kowa 850mm (Click here).

from sonyalpharumors

2015年05月16日のつぶやきまとめを更新しました！

from レンズ沼探検隊ソニー沼担当のつぶやきまとめ@Seesaaブログ

This week SAR readers photos selection.

Jamie Black‎
Found a Coke bottle on the beach
Equipment: Sony A6000 + E PZ 16-50mm F3.5-5.6 OSS Kit lens
Location: Barbados

Quick note: It’s getting harder and harder for me to filter out pics. SAr readers are posting more and more great pictures as you can see from this week collection. Chapeau to all photographers!

1) Submit your picture with a message and picture here: http://ift.tt/1kvK0PS or on the SonyAlphaForum image section.
2) Like and comment the pictures from other readers here: http://ift.tt/13Yf6fV and on SonyAlphaForum.
3) A selection of most liked pictures by the community and by me SAR admin will be posted weekly on SAR.

Note: When sending a pic feel free to also add a link to your site to promote yourself!

Michael Jardeen
A7II 720nm IR converted, with Zenitar 16mm f2.8 Fisheye

Tom English‎
Sony A7 + Canon FD 50 1.2 L
50mm | F1.8 | 1/125s | ISO100

Carlos Rodrigues Silva
“Sony A7 + Sony FE28-70mmF/3.5-5.6OSS in Studio”
Nasty
Model & Photo – Carlos Rodrigues
http://ift.tt/1QCp7Ce

Sergey Kuznetsov‎
Fireworks at the celebration of the 70th anniversary of the Victory in the 1941-1945 Great Patriotic War, 9th of May, Novodevichy convent, Moscow, Russia.
Sony A7 + SEL2470z

Yuri Afanasiev
Sunset, low water. Thailand 2015. Sony a7r + FE 16-35mm F4 ZA OSS
My Site http://www.photoru.ru

Scott Haddad‎
http://ift.tt/1Fgje8R
Maui, north shore

Carlos San Miguel
Mujer del milenio, Tijuana.

Clau Dio‎
Pisagua, a ghost town in the north of Chile and concentration camp in the Pinochet dictatorship.
Comments, questions and suggestion are always welcome smile emoticon
Sony A6000 + Sigma 60mm 2.8 DN ART
@60mm | F 2.8 | 1/1250s | ISO 250

Daniel Cook‎
Walking the Surrey Countryside with A7S and 35mm 1.4 ZA
http://ift.tt/19VY594

Jonathan Ferland-Valois
Limit between Spanish Banks and UBC’s Endowment Lands. It was a really interesting place to be, because while I was still in the city, I was able to point my camera towards an area where the sky was much darker, and I could see light pollution on the opposite side. I’ve seen city glows when I was far between small cities/villages, but never from within the limits of a major city.
A6000 + SEL3518 @f/4, 10 minutes exposure.

Nick Hollywood
Using The Sony A6000 I Covered The Entire Baltimore Protest/Riots In My Home Town Baltimore City And Loved Every Picture So Much That I Published A Book Here Is The Cover… Hope You Like

Bernie Aniciete
Put the FE 28/2 to work today. AF was great, vignettes like crazy but sharp…but for $400, you can’t go wrong with this. Lenses used today were 28/2 (FE) on A7 and 50/1.4 (A), 85/2.8(A) using LA-EA4 on A7s.
http://ift.tt/1wXQY6f
http://ift.tt/1lYRsoB

Carlos Rodrigues
“Sony A7 + Sony FE28-70mmF/3.5-5.6OSS”
Zombieland 3 May 2015
Organization – Carlos Rodrigues
MakeUps – Diana Martins – Fluidesign & Carlos Esteves – Shining Makeup
Collaboration – João Lamas – Fluidesign & José António Cavaco
Models – Catarina Gomes & Fábio Martins
Making of – http://www.youtube.com/watch?v=cFkXw8CML1Q
Group – http://ift.tt/1Es8H6Z

Cherly Jong‎
Pink Tulip
Sony A7R

Calvin Taylor Lee
Highland Cow and Mountain cyclist photo bomb at Curbar edge while sunset 07/05/2015
Sony A7s with Sony CZ24-70mm F2.8
One Click Photographer

Pedro Lopez Alegret‎
American croc in Banco Chinchorro Mexico. Sony RX100 f8, 1/125, ISO 100.

Noslen Oblares‎
shot with Sony a6000

David Safier·
a6000 16-50mm 2.8 A-mount 5 image panoramic hdr. Arizona

Bastian Kratzke
A7 + 50mm 0.95 (Mitakon Speedmaster “Dark Knight”)

Carlos San Miguel

Mark Elias
ClarionBuilds’s 1974 BMW 2002 seen in Orange Country, California, USA. ClarionBuilds is the restoration arm of the Clarion Audio Company, who takes iconic cars and restores them with some modern pieces while keeping the original heritage intact.
Sony a6000, 18-55 zoom 1/60 sec, f6.3, iso 100.
Photo by Mark Elias. http://ift.tt/1d8lRka
vehicle review at: http://ift.tt/1d8lRAo

Fitzpatrick Ricky Guing‎
Shot with the A77 with Sony DT 35mm wide open at F/1.8, ISO 100, 1/320sec during Fajar Kristiono’s workshop that I attended which was held recently at Sarawak Cultural Village, Kuching, Sarawak (Borneo, Malaysia). Image was shot in RAW and edited in Adobe Photoshop CS6.

Gabriel Lam
Sony ILCE-7M2 (α7II) using Carl Zeiss Vario-Tessar T* FE 16-35mm f/4 ZA

Tula Top‎
“The Light of Day”
Falls Creek Falls · Falls Creek · Gifford Pinchot National Forest · Carson · Washington · USA
Sony a7R · Canon 16-35mm f/4L IS · ISO 50 · 30mm · f/13 · 25s
Having an uncompromising work schedule means making compromises in photography, and as such I’ve become accustomed not only to shooting waterfalls in nontraditional (e.g., bright and sunny) conditions but also embracing the challenge that comes with this. I really didn’t think this image was going anywhere when it was sitting as a raw file in my archives, but thanks to the Sony I was able to pull up the shadows and render this high-DR scene with a single exposure. Yes, there are blown highlights on parts of the water, but I think any detail that might have been retained there would have done little to enhance the image (you may disagree, though, and that’s cool with me). wink emoticon Thanks for looking!

Yannick Ciancanelli
My son in the natural reserve of Remerschen, Luxembourg. I hope you like it smile emoticon
Sony A7
Sony Zeiss 16-35 FE
3 exposures merged in Lightroom CC
http://ift.tt/1vyyS9M

Bruno Vais‎
The eye of the storm
Shot with Sony A7R
On our way to Reine it drizzled continuously, the light was pretty flat and it looked like we’re just going to crawl into our beds and start the trip the next morning. Just as we were checking in the cottages the rain let up a bit and the sky basically blew up.
You can view more work from Norway on my website www.brunovais.com