Nikon D4 Assymetrical Problem Follow-up (February 2014)

Started Feb 21, 2014 | Discussions thread
elliotn Senior Member • Posts: 1,890
Re: I have said before, please don't question my mental well-being & OT

surrephoto wrote:

elliotn wrote:

surrephoto wrote:

o> Robin Casady wrote:

surrephoto wrote:

jjnik wrote:

surrephoto wrote:

Canadianguy wrote:

Let me see if I have this correct:

You have been using a defective camera since June 2012 and delivering sub-par images to your clients while collecting full payment from them?

Isn’t this like someone at a restaurant who complaints about the food after eating the whole plate and asking for a full refund? If you don’t like something after the first bite – stop eating it and ask them to redo it or order something else – don’t keep eating it.

If I have a piece of equipment that was required for me to deliver my end product and it was not working properly – I would stop using it as I don’t want my end product to be affected and have upset clients.

Do you have upset clients, do you have clients complaining about un-sharp images? If not – good for you and please keep producing great work for your clients and please stop complaining.

If you have upset clients, please switch to a camera that can deliver great products for your clients and sue Nikon for any lost income from your upset clients.

I have explained all this in previous threads.

Exactly - numerous previous threads. Give it a rest - Nikon has confirmed that your camera is in spec and they will do nothing further to address your "issue" no matter how much you complain here. in fact, I'm really not sure not sure what you hope to accomplish by posting here? What's next - maybe try this outside their corporate HQ and see if it gets you better results - let us know how you make out....

The purpose of my thread is to keep the issue well & alive.

All too often have people been ignored, silenced & isolated by Nikon with various tactics such as legal threats.

There is no issue here, other than the question of your sanity. Your camera is within Nikon specifications. Nikon cannot and will not conform to your fantasy of what it should be.

I would very much to prefer if you keep within topic and not question my sanity. It is a very weak attempt to discredit me. If I am really insane, you'd better thank those insane guys who proved the 1D3, D800, D600 & 1DX issues.

I agree that it is impolite to suggest that you're insane. But when you ask us to keep things on-topic, I've got to wonder what the topic is? What is your question? What sort of conversation do you want to have here?

In a previous thread, you posted some test images as evidence that your camera has the Left AF issue. As a test, I thought it was fairly convincing, but other posters raised valid questions re. your test procedure.

If you want to get feedback here, you need to engage with what people are saying:

- Reshoot your test with Thom Hogan's test chart (it's very similar to the chart Nikon uses in its Test Centres).

- Get your Centre AF sensor correctly fine-tuned, and then do some tests to quantify the degree of back-focus of the Left AF sensor.

- Demonstrate that this degree of back-focus occurs consistently in real word shooting situations.

If you did all this, and if the degree of back-focus turned out to be extreme (say 18 inches when focused at 6 feet), then you would have a strong case, and at least some members of the forum would be behind you. Nikon might even fix your camera.

I'm planning to proceed with new tests with Thom Hogan's Test Chart.

Thom Hogan's describes his test procedure here:

Grab his test jpeg, enlarge it in photoshop to an appropriate size (slightly bigger than an AF sensor, as shown in the viewfinder). Clean it up (the jpeg is tiny, and will have soft edges when enlarged in photoshop). Print it on 3 sheets of matte paper.

I'm respecting your suggestions as you seem forward looking in this post.

I've been through this whole process with Nikon, and contrary to what Robin is suggesting, you do have to do the same thing, over and over, hoping for a different result. In the end it worked out for me.

However Elliot, can you clarify exactly what you mean by "real world shooting"? Static subjects? Humans? Moving subjects?

Static shots of real objects on your kitchen table. Staggered objects. You focus on the Marlboro packet, but the bottle of Jack Daniels 18 inches behind it is in focus. Why do this? Because it feels more real - many peoples' eyes glaze over when looking at test charts.

Also to be honest, there is no reason why my previous test charts are unacceptable. They deliver consistent results which show the left AF point to be completely out of whack.

Yes, I think your previous tests are acceptable. But auto focus is a fickle thing, and it's worth testing and re-testing. If someone thinks your sloped ruler is too close to the chart, and might have confused the AF sensor, then redo the test with the ruler further away (or focus without the ruler, and reinsert it before taking the shot).

It's good to establish an AF Fine Tune value required to get each sensor (Left, Centre, Right) in accurate focus. If you discover that you need -20 for the left, 0 for the centre, and -5 for the right, then that's the classic Left AF problem (with a wide angle lens). If it's much less extreme than that - say, -6, 0, -2, I'd say that's within tolerances (i.e. you're unlikely to have focus issues in real world situations).

Just my opinion.

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