July 30, 2014, 02:29:42 AM

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Messages - J.R.

Pages: 1 ... 3 4 [5] 6 7 ... 98
61
Third Party Manufacturers / A7 / A7R Reviewed by Thom Hogan
« on: March 11, 2014, 06:41:42 AM »
Thom Hogan has completed his review of the A7 / A7R. This bit of his review stands out for me -

Quote
Image Quality: Okay, we are now in one area where I know I’m going to get a lot of blowback: image quality. The number one thing I heard the fanboys all rejoicing about when the A7r was announced was this: “Yes! D800E quality in a smaller, lighter, less expensive body.” No, the A7r produces less than D800E quality in a less expensive body. If you want a free lunch, I suggest you try the local rescue mission.

The difference isn’t actually easy to describe because it involves what’s going on behind the covers. But let me lay out the basics: the D800E will shoot 14-bit raw files with no underlying artifacts and fully recoverable data. The A7r will shoot 11-bit raw files with potential posterization issues in the data. The same is true of the A7 versus a D610, too.

Let’s start with the 11-bit thing. Sony always uses compression in storing raw files. The way they do that is quite clever. They slice each pixel row into 32 pixel blocks. In a Bayer sensor, that means two colors, each with 16 data points). For each 16 pixels of a color, Sony looks at the minimum and maximum pixel values for each and stores that. For the other 14 pixels they store a 7-bit value that is offset from the minimum value. In essence, they get 32 pixel values stored in 16 bytes, when normally 11-bit storage for that data should take 44 bytes.

This is not lossless compression. It is highly lossy. Nor is it visually lossless. That’s because when you have an extreme set of values in the 32-pixel block (e.g. sun peaking out from behind tree edge), you get posterization of data. Don’t believe me? See this article, which describes it better than I can in the limited space of a review. Indeed, every A7/A7r owner should probably have a copy of RawDigger so that they can understand exactly where the issues in their raw files lay. Even Nikon’s optional visually lossless compression scheme does a better job at this, as it hides its posterization only in very bright values that our eyes just don’t resolve.

This factor alone means that the A7r is not equivalent to a D800E. Sorry fanboys, but those of us who want high performance cameras actually want real performance, not a simulation. (I should point out that this compression scheme is used in most Sony cameras now, including the RX1, which is where I first noticed it.)

Coupled with other issues (see Shutter Slap, below), the A7r simply doesn’t match my D800E in optimal collection of raw data. Remember, I used to write a column called Optimal Data, and that’s my mantra when shooting: collect optimal data.


Full review here ... http://www.sansmirror.com/cameras/a-note-about-camera-reviews/sony-nex-camera-reviews/sony-a7-and-a7r-review.html

So basically ... no, I'm not considering the A7R any longer.  8)

62
Lenses / Re: 1.4 lenses kwestion
« on: March 11, 2014, 06:05:16 AM »
No, you are confusing sharpness with IQ which don't necessarily mean the same thing.

To most prime users, the other attributes of the lens, bokeh and low light performance are more important than wide open sharpness.

Sharpness isn't everything, neither is bokeh. The decision hinges entirely on how you intend to use the gear.

63
Landscape / Re: Ugly landscapes
« on: March 11, 2014, 05:58:09 AM »
Ugly landscape ... oh yes, I took one with the lens-cap on, looked ugly as hell. Too bad I deleted it!  ;D

64
Lenses / Re: just hit the purchase button
« on: March 11, 2014, 05:56:33 AM »
I had saved money for the Sigma 35f/1.4 A, but my tax return was higher than I expected, so I just ordered the Canon 24-70f/2.8 II instead!!! Wish me luck!

A.

I would have wished you luck had you got the Sigma given the AF performance can be a bit troublesome. With the 24-70 II you shouldn't need luck, it is the as close to a perfect lens you can have in this FL range.

There are quite a few users that would disagree with you :)

I'm sure there will be a few. TBF, I did choose my words carefully ... no?

65
Software & Accessories / Re: BlackRapid FAIL - grrrrrr
« on: March 11, 2014, 04:12:39 AM »
40,000 INR to FIX!!!  :O  :'( (623USD)....

Grrrrrrrrrrrrr.....  That strap was not worth it!

Ouch! That's steep!

66
Software & Accessories / Re: BlackRapid FAIL - grrrrrr
« on: March 11, 2014, 12:37:33 AM »
Thanks...  I hope they can fix it soon, i'm going to Kaziranga at the end of next week! :(

Hope to see some photos of the Indian Rhinos soon. Good luck with your trip.

PS: Maybe you could test out the Tamron 150-600 while the 70-200 (+2x TC) is under repair :)

67
Lenses / Re: just hit the purchase button
« on: March 11, 2014, 12:32:36 AM »
I had saved money for the Sigma 35f/1.4 A, but my tax return was higher than I expected, so I just ordered the Canon 24-70f/2.8 II instead!!! Wish me luck!

A.

I would have wished you luck had you got the Sigma given the AF performance can be a bit troublesome. With the 24-70 II you shouldn't need luck, it is the as close to a perfect lens you can have in this FL range.

68
Software & Accessories / Re: BlackRapid FAIL - grrrrrr
« on: March 11, 2014, 12:22:54 AM »
Sorry for your loss. I keep hearing these horror stories of cameras detaching from BR straps and getting wrecked and wonder many times as to why I keep using them. That said, this has happened to me as well (in a sort of way). Fortunately, I had taken Martin Bailey's advice and the gear was unharmed.

http://www.martinbaileyphotography.com/2011/05/29/podcast-288-camera-straps-and-safety-measures/

Hope the damage on the 70-200 wasn't too severe and you get your lens back soon. They take too much time repairing lenses here in India.

69
I have a 200-400 on order. I should get it in a few days :) at least when I get bad/average shots with the Canon, I'll only have myself to blame  ;)

70
Photography Technique / Re: How can I get this apple sharp?
« on: March 09, 2014, 07:22:18 AM »
you'll need to focus stack and merge the images, there are various software package out there for focus stacking.

+1 ... Perfect solution

71
Canon EF Prime Lenses / Re: Canon EF 135mm f/2L USM
« on: March 09, 2014, 07:20:07 AM »
Another flower shot with the 135mm ... this one at f/2.8

Great!  What flower is that?

Thanks Carl!

This is commonly known as the bottlebrush flower ... Botanical genus is Callistemon.

72
Thanks for the replies.

Keep them vertical and dry. That way they'll last for as long as you want. If you leave a paper background permanently up in your studio with a Manfrotto style background support, you'll notice a slight sag in the middle after a few months, particularly if you live in a humid environment. My solution is to source an appropriately light weight, yet strong aluminium tube; get one that is the correct diameter to fit snugly inside the cardboard tube/core of your paper roll. Cut it to length, just a touch longer than your paper roll.

With the Manfrotto style background support with the thingys that expand/grip inside the cardboard tube, then you need to do this. Get your angle grinder and make four 6-8 inch long cuts at each end of the aluminium tube. This allows the Manfrotto expanders to grip snugly on your paper roll. Without the cuts, your paper roll will just spin on the aluminium tube. There you go! A handy little home-grown invention.

-pw

This DIY solution is awesome. Thanks pwp!

73
EOS Bodies / Re: 6D 1.1.4 Firmware upgrade sighted!
« on: March 08, 2014, 01:32:00 PM »
No option for none of the above???

74
Third Party Manufacturers / Re: Sony A7/A7r Light Leak Issue
« on: March 06, 2014, 11:01:12 AM »
How's the DR performance when you lift five stops of the lens-cap on photos? 

75
Reviews / Re: Review - Canon EF 50mm f/1.4
« on: March 06, 2014, 10:59:38 AM »
I keep hearing people complain about the focusing problems with the f/1.4. I guess I have a pretty good copy because mine works superbly when paired with the 5D3.

That said, focus shift is not a problem for me. The f/1.4 comes out only when light levels are real low and I'm shooting wide open most of the time. For reasonable light shooting, I use the 24-70II which is as sharp as anything at 50mm at almost all aperture settings. 

Pages: 1 ... 3 4 [5] 6 7 ... 98