Using a macro filter

[Holly K]

Using #2 macro filter for the first time and can’t get a focus with either auto or manual focus.  Aperture 5.3.  Any tips?

[beth]

when you say macro filter you mean the screw on filters that act like a magnifying glass?  you may need to get much closer to the subject.  or maybe a little further away.  there are parts of your image that are in focus so you aren’t far off.  also, keep in mind the images from these filters may not be as sharp as you’d expect, so what you call blurry or soft may be the best you’re going to get.

[Robert Apple]

Looking at your specs, with an ISO of 800 and a wide open lens looks like you were suffering from a lack of light, as Beth pointed out some parts are in focus, you are going to have a fairly shallow depth of field with that 44mm lens and going to around f11 aperture will help with that a little, again lack of light. Also if you are on a tripod make sure you have any image stabilization turned off. I have had good luck with these filters and good sharp photos are definitely possible.

[bucweeet]

Using an EXIF reader on your image Holly, it states:

EXIF Data:
FocusDistance 0.30 m
FocalLength 43.6 mm

MinFocalLength 18.3 mm
MaxFocalLength 55.0 mm

With the EXIF FocusDistance equated in feet:
Focus Distance in feet
0.30 m –> 0.9 ft

Then using a Depth of Field (DOF) Calculator:
DOF Calculation for Nikon D3100 Focal Length:44.7 @f/5.6 –> Subject Distance: 1 ft

Near limit 0.99 ft
Far limit 1.01 ft
Total DOF 0.03 ft or 0.36 inches (just over 1/4 inch DOF)

With using a macro filter, I’m guessing the DOF is even shorter (which is what is seen in your image)

As suggested by others, I would try a much smaller aperture (possibly even greater than f/11). As one can guess, you will require a ‘lot more light’, or an extended shutter speed (bulb at 5 to 30 seconds). Definitely need a tripod.

Good luck!

[Holly K]

Thank you, light stalkers!

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