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General photography questions and answers: Discuss Focus test...This is a quick focus test from my latest D300. The focus point is the eye centre. The lens is ...
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Old 16-05-2008, 07:39   #1 (permalink)
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Focus test

This is a quick focus test from my latest D300.
The focus point is the eye centre.
The lens is at 70mm wide open, hand held at 1/80 s.
This is at the lens' minimum focus distance.
It is a 100% crop (I think)

Does anyone feel the image is in acceptable focus?


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Old 16-05-2008, 08:01   #2 (permalink)
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Re: Focus test

Looks as if it's staring at me sufficiently thanks (and follows me around the room!). Makeup needs attention!
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Old 16-05-2008, 08:03   #3 (permalink)
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Re: Focus test

This chart might be useful to see what the theory says.

You can select your camera and lens focal length.

Only problem I can see is that the actual DoF does not say what units it is measured in. 70mm, range 1 metre at f4 = near .99, far 1.02, but is that metres or millimetres?

I can't see it being metres, so it looks like 3mm DoF.
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Old 16-05-2008, 08:11   #4 (permalink)
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Re: Focus test

You say it was hand held at 1/80th. In that case it looks very good to me. I assume that it has VR turned on. For a focus test it should really have been on a tripod
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Old 16-05-2008, 08:14   #5 (permalink)
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Re: Focus test

Further to my last post, this chart gives the DoF at 0.09 at 2 metres.

I used 105mm lens in 35mm format as there seems not to be a crop factor digital format.

On the strength of these two charts, it would appear that your shot is within tolerance.
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Old 16-05-2008, 08:29   #6 (permalink)
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Re: Focus test

Thanks for looking all.

As a point of little interest, it is the non vr 18-70 kit lens.

I'll go along with the DOF chart as it looks about 3 ish mm to me.

I still feel the actual shiny surface of the eye is marginal but that could be down to eye movement given the shutter speed is only just above the rule, and I don't have the steadiest hand in the world.
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Old 16-05-2008, 08:30   #7 (permalink)
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Re: Focus test

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Looks as if it's staring at me sufficiently thanks (and follows me around the room!). Makeup needs attention!
I'll check my mascara now!
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Old 16-05-2008, 09:14   #8 (permalink)
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Re: Focus test

Looks good to me .The spot on focal points to me appear to be anything thats on the same distance as the corner of the eye,hence to surface of the eyeball is a tad out.The centre eye lashes are extending further than the corner ones so become slightly OOF.
On a technical point I would rate this shot as being 99.99% for the lens. I don't think you would get much better that what you have achieved Soup. Possibly your nickname could become "Steady Hand Soup"
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Old 16-05-2008, 09:41   #9 (permalink)
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Re: Focus test

That focus is as good as you could hope for, no problems there
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Old 16-05-2008, 09:44   #10 (permalink)
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Re: Focus test

Thanks for the reassuring comments!

I guess if I stopped down to f8, all would be much better!
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Old 16-05-2008, 09:46   #11 (permalink)
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Re: Focus test

That's true, the 18-70 is much sharper stopped down a couple of stops, so it would look even better, but tbh there isn't anything wrong here either...
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Old 16-05-2008, 09:46   #12 (permalink)
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Re: Focus test

I just realised I can see myself in the reflection.

Perhaps this should be moved to the mugshots section?
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Old 16-05-2008, 09:48   #13 (permalink)
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Re: Focus test

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That's true, the 18-70 is much sharper stopped down a couple of stops, so it would look even better, but tbh there isn't anything wrong here either...
Cool, I tend to be a bit paranoid about my stuff, especially within the first 28 days of ownership (here come the puns).
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Old 16-05-2008, 09:50   #14 (permalink)
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Re: Focus test

If you want to test your focus I can heartily recommend the link below (which I believe was in turn provided to me by someone on this site). This will allow you to check the forward and back focus of your camera / lens.

Nikon D70 Focus Chart

Ignore what it says about Nikon D70 - this works for any SLR camera / lens.
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Old 16-05-2008, 09:54   #15 (permalink)
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Re: Focus test

Thanks, I might just give that a go this evening.
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Old 16-05-2008, 16:28   #16 (permalink)
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Re: Focus test

Quote:
Originally Posted by Soupdragon View Post
Cool, I tend to be a bit paranoid about my stuff, especially within the first 28 days of ownership (here come the puns).
Thank god someone is as bad as me I start panicking it might not be right just as I leave the shop
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Old 16-05-2008, 16:36   #17 (permalink)
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Re: Focus test

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Thank god someone is as bad as me I start panicking it might not be right just as I leave the shop
If I were from the financial gifted I would not worry butm nearly £1200 is a lot for me.
I pay less than that for my cars.
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Old 16-05-2008, 16:43   #18 (permalink)
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Re: Focus test

There doesn't look to be much wrong with that, Soupy - it's a keeper! (The camera, I mean. )

One thing that may be clouding the issue here is that you're focusing on the cornea which is transparent, so it's like taking a photo through a window. The camera may be focusing on a point behind the window which is perfectly OK.
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Old 16-05-2008, 16:50   #19 (permalink)
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Re: Focus test

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There doesn't look to be much wrong with that, Soupy - it's a keeper! (The camera, I mean. )

One thing that may be clouding the issue here is that you're focusing on the cornea which is transparent, so it's like taking a photo through a window. The camera may be focusing on a point behind the window which is perfectly OK.
What? I'm focused on my daughters brain, eeeeeek!
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Old 26-05-2008, 10:00   #20 (permalink)
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Re: Focus test

Quote:
Originally Posted by Larne View Post
If you want to test your focus I can heartily recommend the link below (which I believe was in turn provided to me by someone on this site). This will allow you to check the forward and back focus of your camera / lens.
Thanks for the link - it's just what I was looking for as I took a batch of photo's at a dinner dance and every one looked a bit soft - I'll check the lens out
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Old 26-05-2008, 10:23   #21 (permalink)
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Re: Focus test

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Thanks for the link - it's just what I was looking for as I took a batch of photo's at a dinner dance and every one looked a bit soft - I'll check the lens out

Please read my posting on what I have discovered about the myth of AF fine tune.

Probably for D300 owners only:
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