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Tuscany   -   Page   3
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Posted: Wed Mar 27th, 2019 07:00
 
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Eric



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chrisbet wrote:
Yes, the dog was difficult as he was sitting on my lap!!
Not sure what you are trying to establish or confirm here, Chris? Are you concerned about the sharpness of the lenses, the resolving power of the D90 or your technique?

For what it's worth.... using a 50mm lens at f2.5 on a subject at 500mm? distance (about your lap size?) will give you a depth of field of just 10mm! Even at f16 it's only 55-60mm. So you aren't going to learn anything about the lens sharpness working that close.

I know people talk about using wide apertures to isolate and draw greater attention on some detail but I think that's sometimes over egged by many photographers. IMHO. Sometimes getting a good composition and dynamic lighting is sufficient to tell the story...even at f8!  

So what are your concerns now?



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Posted: Wed Mar 27th, 2019 07:12
 
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Eric



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chrisbet wrote:
I was focussing on the dog's head and see that the sand in front and just behind gives a good idea of dof

I was using af-a and the area focus - I am going to try again with spot focus this pm

Just spotted you said you were using the AF-A.

Take it off that....you are letting the camera decide what to focus on. Use AF-S for static subjects and single spot focusing mode.



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Posted: Wed Mar 27th, 2019 09:23
 
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chrisbet



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Posted: Wed Mar 27th, 2019 09:27
 
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chrisbet



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I am just exploring the limits of the lenses. Yes I have switched to manual with af-s or af-c for the ones of the moving horse.



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Posted: Wed Mar 27th, 2019 09:39
 
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chrisbet



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I took a whole series of photos of the horse  being lunged and as this is on a circle the distance to the subject is constantly changing - I found that using af-c spot focusing gave erractic results - the spot has only to slip off the horse onto the background as the horse bucks or leaps and you get a fuzzy horse !



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Posted: Wed Mar 27th, 2019 09:40
 
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Eric



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chrisbet wrote:
I am just exploring the limits of the lenses. Yes I have switched to manual with af-s or af-c for the ones of the moving horse.
Ah ok.

Were you deliberately overexposing the white horse shots then?  
It's just that you've blown the highlights and have no true black in the last image for one.

Getting the black point set correctly will help sharpness.....

Attachment: 4B685036-F5B7-44C3-8C59-AE78966C074E.jpeg (Downloaded 100 times)



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Posted: Wed Mar 27th, 2019 09:48
 
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Eric



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Like this......

Attachment: 8850A724-A43D-4302-AF61-87DE9284BB01.jpeg (Downloaded 96 times)



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Posted: Wed Mar 27th, 2019 13:04
 
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chrisbet



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Ahh - thanks - that was my next project to learn about the histograms 😊



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Posted: Sun Mar 31st, 2019 04:35
 
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chrisbet



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I have downloaded Darktable for Linux - methinks it will take a while to master the filters....

but this is my first attempt at post processing using it - comments?




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Posted: Sun Mar 31st, 2019 07:33
 
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jk



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Also try LightZone for linux.  It is free.
http://lightzoneproject.org

This uses the Zone system as its method of determining curves/levels.  It takes a little getting used to initially but is very good.



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