Alpha on Amazon

Subscribe to Cameracraft

Cameracraft is one of the highest quality photo enthusiast magazines you'll find - worldwide. Our Photoclubalpha subscription deal is £4.80 less (UK) than the current discounted offer - it's the lowest cost you can get. The cost will be held for three years and you can cancel at any time. Visit our web pages to see the regular deals, or subscribe below.

Postal Region

Photoclubalpha Forum

Join our free Forum for a wealth of info, great company and some fantastic photo sharing threads! Registration on the Forum is separate from Registration on the website, but you are allowed to register using the same name and password.
  • Give it Your Best Shot • Re: Car Parts June 19, 2018
    Fancy neighborhood David Antony. Branches were tad masking the Mercury though in the first one.SuryStatistics: Posted by sury — Tue Jun 19, 2018 11:49 pm
    sury
  • Give it Your Best Shot • Re: Car Parts June 19, 2018
    Taken the past hour Monday June 18. 8:30 pm hand held.No where near the class of all other fine photos here.Visitors to my next door neighbour.My neighbours Bentley some how got the betterin the 2nd shot!Statistics: Posted by david antony — Tue Jun 19, 2018 5:27 am
    david antony
  • Give it Your Best Shot • Re: Car Parts June 19, 2018
    Another great addition sury. Yes the Rolls looks terrific valery.Statistics: Posted by david antony — Tue Jun 19, 2018 5:21 am
    david antony
  • Give it Your Best Shot • Re: Car Parts June 17, 2018
    Thank you Valery. Love that 69 Rolls.Statistics: Posted by sury — Sun Jun 17, 2018 7:56 pm
    sury
  • Digital non-SLR • Re: Fuji X10 on it's last legs.... June 17, 2018
    Back in Stock: Reconditioned Olympus E-M10II for $299//www.43rumors.com/back-in-stock-reconditioned-olympus-e-m10ii-for-299/Statistics: Posted by bakubo — Sun Jun 17, 2018 7:04 pm
    bakubo

Past Article Calendar

August 2015
M T W T F S S
« Jul   Sep »
 12
3456789
10111213141516
17181920212223
24252627282930
31  

A7RII versus Pentax 645Z

At a workshop given by John Denton for The Flash Centre, with Elinchrom lighting and Pentax 645Z demonstration. model Laura posed for a comparison pair of shots using the Pentax with 90mm macro lens and the A7RII equipped I regret to say with a much inferior lens, the basic 28-70mm.

To compare the quality bear in mind that the Pentax was ISO 200 at f/5.6 and the Sony was ISO 400 at f/8 as I felt it necessary to stop down – I should not have, as I had forgotten than the 28-70mm is sharper at f/5.6 than f/8, which introduces local unsharpness to the left hand end of the image (landscape) and did with all three samples I have used. This means the model’s face is smeared on the Sony shot, because this lens can’t produce a sharp image under these conditions in that part of the frame. Yes, I’ve had some OK results, but this was the first time I used the 28-70mm on the A7RII. It is OK on the A7II and A7S, as the blur is not so visible at those magnifications. It’s really not good on the A7R or A7RII.

So, please examine everything except the face…

This is the Pentax shot. Despite the matched for theoretical exposure, it is much darker and the ISO 200 is only equal to ISO 100 in Sony terms. Daylight balance set for the flash, Adobe Camera Standard profile since no other is available.

Here is the full resolution link to 146MB (if opened or downloaded) original:

//www.pbase.com/davidkilpatrick/image/160895282

This is the Sony shot. The Camera Portrait profile in ACR gave much improved skin tones, so I’ve used this. The pBase link appears to have scaled the images proprotionally, so the 42Mp image is correctly smaller than the 50Mp.

Here is the link to the 120MB original:

//www.pbase.com/davidkilpatrick/image/160895292

Enjoy – John teaches retouching and has set up deliberately harsh lighting to create over-sharp skin and too much detail, which he then expertly ‘fixes’. My shots are un-fixed. His workshops are worth every penny as he delivers an entire set of notes and his Photoshop actions to all delegates.

– David Kilpatrick

1 comment to A7RII versus Pentax 645Z