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bodacious 2 IMG_7836aw


gregverena

Exposure Date: 2013:08:31 14:56:35;
Make: Canon;
Model: Canon EOS 5D Mark II;
ExposureTime: 10/1 s;
FNumber: f/25;
ISOSpeedRatings: 50;
ExposureProgram: Manual;
ExposureBiasValue: 0/1;
MeteringMode: Spot;
Flash: Flash did not fire, compulsory flash mode;
FocalLength: 100 mm;
Software: Adobe Photoshop CS5.1 Windows;
ExifGpsLatitude: 48 49 48 48;
ExifGpsLatitudeRef: R98;


From the category:

Flower

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Nice image. I enjoy it.

 

I only wonder why you use f25. I guess that is because of the DOF. A trick I use, inspired by the comments of Mike Palermiti, is to back off the subject. If the distance is larger the DOF increases dramatically, and you can use lower f stops. The frame is then not filled but I crop later. This results in crisper images because lenses are at there best a few stops above the widest aperture.

 

Ben

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Hi Ben,

Thanks for your interest.  Generally, I have found that the smaller f-stops on close up images will give greater dof than more open ones. It is true, that by backing up you can use a wider stop and get good images. That is why this one is 25 instead of my usual 32 for very close shots. This is a very large bloom (10" more or less) so I was quite backed up to get it all in the frame. I try different stops to see which starts losing dof and choose the next one. The problem with backing up so much just to use a wider aperture is that when you then crop, you will lose detail by virtue of the fact that as you crop closer, the pixels become further apart  and you lose image information with which to work. I prefer to get as much info in the frame as possible then work on sharpening afterwards. Also, the small aperture gives me more shutter time in which to experiment with light angles (hence the 10 sec exposure). This would not work in an outside environment,- different ball game there.

This method seems to work for me. I will not try to force it on anyone else, but, when asked, I will explain and if someone wants to try it out- go for it!

Do you really find that this image could be crisper? Someday, when I have lots of time, I will post a series of shots I made at differing f-stops from 2.8 to 32 to show the difference.

Cheers!

Greg

 

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