New Macro Lens
Feb 25, 2013 06:40:14 #
This is my first attempt at macro with dslr. Did a lot with 35mm in the 80's. This is new Tamron 70-300 macro on Nikon D7000. If it works this well in the field, I will be content. C&C are always welcomed. Ray
Feb 25, 2013 11:44:09 #
Feb 25, 2013 17:40:21 #
Two characteristics separate a true macro lens from all other lenses:
1.) Flat Field-of-Focus, which keeps flat subjects in focus, corner to corner. Regular lenses have a curved FoF, similar to the curve of the lens' front element.
2.) 1:1 magnification (life-size) at Minimum Focusing Distance, without the aid of tubes or additional lenses.
Per Tamron website http://www.tamron.co.jp/en/lineup/a005/spec.html , your lens has a maximum mag. ratio of 1:4 (1/4 life-size) at an MFD of 1500-mm (1.5-meters).
It is possible to crop a subject to 1:1 mag (life-size) in post processing, but not possible to photograph macro without adding extension tubes or more lens.
Also, your D7000 has a sensor size of 23.6-mm x 15.6-mm. If your coin is the size of a dime (17-mm diameter) or larger, then your photo is a close-up, not a macro-photograph.
1.) Flat Field-of-Focus, which keeps flat subjects in focus, corner to corner. Regular lenses have a curved FoF, similar to the curve of the lens' front element.
2.) 1:1 magnification (life-size) at Minimum Focusing Distance, without the aid of tubes or additional lenses.
Per Tamron website http://www.tamron.co.jp/en/lineup/a005/spec.html , your lens has a maximum mag. ratio of 1:4 (1/4 life-size) at an MFD of 1500-mm (1.5-meters).
It is possible to crop a subject to 1:1 mag (life-size) in post processing, but not possible to photograph macro without adding extension tubes or more lens.
Also, your D7000 has a sensor size of 23.6-mm x 15.6-mm. If your coin is the size of a dime (17-mm diameter) or larger, then your photo is a close-up, not a macro-photograph.
Feb 25, 2013 17:52:41 #
Specs given by B&H. Never known them to fib.
Mfr # AF017NII-700 The 70-300mm Di LD Macro is a quality compact ultra tele zoom lens which covers the 70mm to 300mm telephoto range, with a maximum magnification ratio of 1:2 at the tele end. The model # is A17NII
Mfr # AF017NII-700 The 70-300mm Di LD Macro is a quality compact ultra tele zoom lens which covers the 70mm to 300mm telephoto range, with a maximum magnification ratio of 1:2 at the tele end. The model # is A17NII
Feb 25, 2013 19:14:00 #
I found your lens here: http://www.tamron-usa.com/lenses/prod/70300_di_a017.asp
Magnification Ratio = 1:2 (1/2 life-size) at MFD of 95-mm (0.95m)
Better, but still not Flat Field, nor true macro capture. Less cropping in PP to arrive at macro field.
What is millimeter diameter of your coin?
Magnification Ratio = 1:2 (1/2 life-size) at MFD of 95-mm (0.95m)
Better, but still not Flat Field, nor true macro capture. Less cropping in PP to arrive at macro field.
What is millimeter diameter of your coin?
Feb 25, 2013 19:52:48 #
Nikonian72 wrote:
I found your lens here: http://www.tamron-usa.com/lenses/prod/70300_di_a017.asp
Magnification Ratio = 1:2 (1/2 life-size) at MFD of 95-mm (0.95m)
Better, but still not Flat Field, nor true macro capture. Less cropping in PP to arrive at macro field.
What is millimeter diameter of your coin?
Magnification Ratio = 1:2 (1/2 life-size) at MFD of 95-mm (0.95m)
Better, but still not Flat Field, nor true macro capture. Less cropping in PP to arrive at macro field.
What is millimeter diameter of your coin?
34mm
Feb 25, 2013 20:23:01 #
rrayr2002 wrote:
16-mm (height of coin on sensor)/34-mm = .47x = approx. 1:2 = approx 1/2 life-size.Nikonian72 wrote:
34mmWhat is millimeter diameter of your coin?
Feb 25, 2013 20:29:05 #
Nikonian72 wrote:
rrayr2002 wrote:
16-mm (height of coin on sensor)/34-mm = .47x = approx. 1:2 = approx 1/2 life-size.Nikonian72 wrote:
34mmWhat is millimeter diameter of your coin?
Sounds about right to me.
I have tubes for my 35 & 50 mm prime lenses
Feb 26, 2013 13:12:03 #
Feb 26, 2013 13:13:56 #
jeep_daddy wrote:
21 on St. Patrick's DayHow many years have you known Bill W?
Feb 26, 2013 14:06:12 #
rrayr2002 wrote:
Good for you. I've known him for almost 25 years. 25 in April.jeep_daddy wrote:
21 on St. Patrick's DayHow many years have you known Bill W?
Mar 2, 2013 21:05:55 #
jeep_daddy wrote:
24 in Nov for meI've known him for almost 25 years. 25 in April.
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