August 29, 2015, 03:32:27 AM

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51
Third Party Manufacturers / Re: "Sony A7R II: Focus Accuracy
« Last post by Neutral on August 28, 2015, 05:46:55 PM »
Focus on the A7R II should be accurate, at least for still photos.

As for high ISO, its fine if you down sample it to 8mp.  Might as well just buy a 8 mp camera though.

There is a very good article on DPR describing the low light autofocus and the issues as well as benefits which depend on the lens you use.  Basically, you need to use a F2 or faster lens to get fast low light AF.  For f/2.8 and slower, DSLR's may have a accuracy and speed advantage at least in low light.

http://www.dpreview.com/articles/6884391759/sony-alpha-7r-ii-can-match-or-beat-dslr-low-light-af-performance?utm_campaign=internal-link&utm_source=features-default&utm_medium=homepage-block&ref=features-default

1. Exactly - as all AF data are provided directly from the sensor and sensor PDAF points.
    But it is also important  to set focus point to where is exactly required so proper AF mode/AF point  selection is critical.
       E.g. to focus on eye it is better to use eye AF - this works very well.
       To make it easy to use (works almost instantly)   the best way is to set AEL button for eye AF and use AF-C mode instead of AF-S. 
       Then A7rII tracks eye even when face is moving across the frame
           

2. When DPR published results of this test I did the same tests next day with Canon 85mm F1.2L II and native Zeiss 35 mm F1.4 and had the same results. This was nice surprise.
So I was mentioning this here  (AF was functional for brightness level below -6)   and in other posts earlier. This ability is basically function of light captured by sensor.
More light in dim conditions  coming on sensor - means less noise , more accurate and fast AF.
The only problem with Canon lenses  - eye AF is not possible and as well as  continuous AF in video mode
Having said that also need to add that AF speed is different for different lenses - e.g. on new  90mm macro it is noticeable slower than on Zeiss 35mm F.1.4  or Sony 55mm F1.8

So far I am pleased with a7rII.  Of course it has it's weak points , there is nothing 100% perfect in our world, but in general set of features is very well balanced.
 

52
Third Party Manufacturers / Re: New Tamron Prime Lenses Coming
« Last post by Luds34 on August 28, 2015, 05:43:34 PM »
I wonder how their 35 perform against Canon's 35 f/2 with IS? Also the price...
I imagine a similar price with the Canon 35mm F2 IS.
If the Tamron has 80% of the image quality, and cost less than the Canon, can be advantageous because the aperture F1.8

The other thing is that Tamron seems to have figured out the Canon focus system alot better then Sigma. Or at least figured it out earlier as maybe Sigma finally cracked that nut with their latest stuff. The couple of Tamron lenses I have owned have focused spot on and consistently. Tamron's latest lenses seem to give like 90% of the performance of the Canon equivalent lens for roughly half the price.

While I probably will not be purchasing either of these lenses as I already have primes in the 35mm, 40mm, and 50mm ranges, consider me quite intrigued. I'll be following these developments.
53
EOS Bodies / Re: Looking to upgrade to the 1Dx
« Last post by Mt Spokane Photography on August 28, 2015, 05:33:27 PM »
Again.....no idea where u guys r seeing retailers offering that high for a used IV! Unless ur speaking of private buyers such as on eBay or Craigslist? I'm sorry but I would never buy or sell something w a high value on sitesike that sorry maybe it's just me! I'd buy a shirt for $20, maybe even a pair of Jordans (& they're usually fake most of the time) on sites such as these, but a Rolex, camera, etc. I'd rather spend a few more bucks & go the legit route sorry...again maybe it's just me but I value piece of mind! So yeah, I'll sell it to ya for $900 USD...just add the $300 or $400 shipping to ur continent lol!

The going price is not a trade in price.  They give you about 70% or less of the normal selling price for  trade in equipment, so you lose a lot.  In your case, it sounds like $600 or $700 depending on the condition.

The price I'm referring to is the selling price of the Camera on the Fred Miranda web site where many photographers sell their cameras. 

I don't know where you are located that it would cost $300 to ship a camera to the USA, a 1D MK IV weighs maybe 7 lbs to ship, which might run $65 for priority mail express to Germany, or $25 to ship from NYC to Spokane.

Buy that new camera outright and then sell your used one.  It will sell in a day for $1400 on Fred Miranda.
54
Obviously the author doesn't own a 7DII.
55
Color Sensitivity graph is also very interesting.
Both SNR,DR and this graph shows that Sony does something starting from ISO 25K on a7r2 to improve very high ISO performance and make it  more usable compared to competitors.

I believe that's when they start dialing in a lot of spacial filtering. The really important shift is the one at 640, where the conversion gain evidently changes.

I think your refer to this article ?
----------------
http://blog.kasson.com/?p=11168

•The D810 has better base ISO  read noise and EDR.
•The cameras are neck and neck at ISO 100.
At ISO 640, the a7RII pulls ahead and stays ahead.
The a7RII improvement at ISO 32000 and above is bogus, accomplished through in-camera spatial low-pass filtering.
------------------


56
Third Party Manufacturers / Re: A7RII F1.2 Exposure Comparison?
« Last post by Mt Spokane Photography on August 28, 2015, 05:14:13 PM »
You can't compare with a Canon lens, since the adapter puts it back and changes the angle.  Sony does not have Native f/1.2 lenses, so you won't get a answer as far as a native lens.

Placing a lens further from the sensor should help with corners and edges.  You would have to use a MF lens and adapter with a 5D MK III to get any sort of apples to apples comparison.
57
Third Party Manufacturers / Re: "Sony A7R II: Focus Accuracy
« Last post by Mt Spokane Photography on August 28, 2015, 05:08:09 PM »
Focus on the A7R II should be accurate, at least for still photos.

As for high ISO, its fine if you down sample it to 8mp.  Might as well just buy a 8 mp camera though.

There is a very good article on DPR describing the low light autofocus and the issues as well as benefits which depend on the lens you use.  Basically, you need to use a F2 or faster lens to get fast low light AF.  For f/2.8 and slower, DSLR's may have a accuracy and speed advantage at least in low light.

http://www.dpreview.com/articles/6884391759/sony-alpha-7r-ii-can-match-or-beat-dslr-low-light-af-performance?utm_campaign=internal-link&utm_source=features-default&utm_medium=homepage-block&ref=features-default


Unfortunately, DPR does not have their studio results yet available so that the cameras can be compared under different lighting and ISO's.

The jpeg images on imaging resource look pretty good though.

http://www.imaging-resource.com/IMCOMP/COMPS01.HTM
So, the situation is not clear cut, like all cameras, you need to know exactly how the AF works so you can get the most out of it.  Unfortunately, you are not always able to use optimum settings, in which case, AF will suffer.

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[size=12pt]I just pushed the button this morning. I was planning for some time to get one and thought I'd wait till Dec. but B&H have a really good deal now, $4249 with lots of items included and rebate. When I saw it go from $5400 earlier this summer down to this price now I knew it was time. Will have plenty of opportunities to use it now too with HS sports beginning this week.[/size]
59
Third Party Manufacturers / Re: New Tamron Prime Lenses Coming
« Last post by StudentOfLight on August 28, 2015, 04:13:10 PM »
I wonder if pricing will be around the $800 mark in order to compete with:
1) vs 35mm f/1.4L II: Considerably lower price and also has VC
2) vs 35mm f/1.4 Art: has VC (maybe weather-sealed and similar optical performance???)
3) vs 35mm f/2 IS: Slightly faster (maybe weather-sealed and also less vignette???)
60
Third Party Manufacturers / Re: New Tamron Prime Lenses Coming
« Last post by KungFeuz on August 28, 2015, 04:10:31 PM »
I wonder how their 35 perform against Canon's 35 f/2 with IS? Also the price...
I imagine a similar price with the Canon 35mm F2 IS.
If the Tamron has 80% of the image quality, and cost less than the Canon, can be advantageous because the aperture F1.8
That extra third of a stop will be a life saver.
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