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C'erano 3 risultati taggati con macrophotography
My new experience withe the Sigma SD Quattro, this time equipped with a true macro, the excellent Sigma 150mm f2.8 Macro OS enabled me to experiment something new, along with usual "scientific" or documentaitve photos, I tried to look for unusual, tighter shots, with the aim to transform reality into something more creative, a sort of abstract photography.
First, user impression
These are the limits.
That said, the good thing is that with a true macro lens you can make ... true macros (with astonishing sharpness)!
please click on the images to appreciate how this kit works!
How little is that dark critter?
A curled up trilobite, I have stacked eight photos to get enough depth of field.
In the first session I had problems with flimsy supports and less than ideal lights, that caused some shake and slight focusing problems, however I succeeded to get some satisfactory results:
A stone arrowhead made by ancient Native Americans nearly ten thousands years ago. Wow.
You can see the corals, how cool , really.
An eel 100 millions year old, in visible light
Here you can see it had eaten a mantis shrimp, again visible light
And that's what sorts out in UV light. It is simply awesome. Look how the different composition of the shrimp exoskeleton and the eel bones (black) is made evident and how both are tremendously sharp. Also a colleague that was with me was really amazed.
- nov 14 2016 09:21
- da Silvio Renesto
Main features, pros and cons of the Sigma SD Quattro have already been extensively described in many sites and here on Nikonland byMauro Maratta in his articolo, that I recommend reading (it's in Italian Language by the way) .
I will not repeat them here. I will instead show how this unusual camera surprised (and enthralled) me as a tool for my work, giving me a very special user experience.
I am a vertebrate Paleontologist and my field of interest are fossil reptiles of the Triassic (roughly 250-200 million years ago) . I published over sixty scientific papers and also have a lot of teaching and popular education activities in my University Department.
No need to say that photography plays a fundamental role in Palaeontology both for illustration of one's studies and for didactic purposes.
Since fossils are amongst the most quiet things (along with rocks) in the natural world, the main shortcomings of the Sigma Dp Quattro, concerning ISO, reaction times and so on, become irrelevant. With a good stand or tripod and right lights, one can take photos at 100 ISO with proper apertures and exposure time,s without any worry. Thus, the shortcomings are gone, but the good qualities are still there. Mainly, as we will see later, the richness of detail and the perception of three-dimensionality that the camera gives to images. Something I believe can be obtained only with much more expensive or bulky (or both) equipment.
A Jurassic Ammonite
However, what renders the photos taken with the Sigma Dp Quattro really different (and useful) for my work, does not concern photographs of complete specimen to be published on scientific journals (where, given the requested sizes, any good or decent DSRL will do the job) but rather the great sharpness of fine details, and the usability of even the biggest crops. This is a plus both for research and for teaching.
I take a photo of this Ammonite that still has the shell preserved. a rather uncommonevent. The specimen is about 4-5cm in diameter. I photographed it with the Sigma 50mm f1.4 ART and the Achromatic close up lens Marumi 3x, because a 105mm macro Sigma wasn't available for the test. Note: all photos have been taken with the 50mm f1.4 ART with or without the Marumi according to need.
Below, the 100%crop:
Section of another Ammonite. This one is pyritized (that is, it is encrusted by iron sulphide, due to a reaction that occurs in anoxic sea bottoms often by action of bacteria).
Again, a 100% crop:
you can see the little creases of the leaflets:
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- nov 14 2016 09:21
- da Silvio Renesto
I have just tried the new Sigma 150mm f 2.8 Apo Macro OS, a lens with excellent reputation not only among macrophotographers, but also among portrait shooters. However I tried it only as a macro lens, comparing it with the Micro-nikkor 105 f2.8 AfS VR as well as with its main competitor, the legendary Nikon 200mm f4 micro-nikkor AfD ED.
Years ago I had used for some time the Sigma 150mm f2.8 Apo Macro EX (non OS), and I found it had excellent quality for general photography, apart for a little warm rendition in some occasions, but it was somewhat short for my needs, thus I replaced it with the Sigma 180mm f3.5 Apo macro Ex at first, subsequently with Nikon 200mm f4 micro-nikkor AfD ED.
Recently Mauro Maratta kindly offered me to try the new Sigma 150mm Apo Macro OS, to test its performance in macrophotography. As an enthusiast as I am, I accepted gladly, driven also by the curiosity to check if performances are on par with the reputation this lens has gained, and also if my attitude toward shorter focal lengths in macro has changed.
Lens and groups: 19 lens in 13 groups, 3 SLD elements
Diaphragm with 9 blades
Minimum focusing distance 38 cm (reproduction ratio 1:1)
Size (width x length) 80x150mm
Filter size 72mm
Hood and tripod collar (rotatable and detachable) supplied.
Focus limiter and (obviously) image stabilizer.
Costruction and ergonomy.
I would say it's exciting at least. For the first time I found in a Sigma lens a pleasant tactyle feeling no more crackling or sticking/"greasy" coatings) joined with a sense of sturdness. The Sigma 180mm f3.5 Macro was also quite sturdy while the last black version of the Bigma (50-500mm) had a good coating , but with the 150 Os we are at the top for Sigma (at the time of writing, now the Sigma 180mm Macro f2.8 OS is on par, or even better, as are the other high-end lenses of the Art/Sport series).
Another plus of the Sigma 150, as for the previous non OS model, is its compactness, perfectly suited for a mid-sized DSRL. In short, handling this lens is a pleasure.
The Sigma 150 Apo macro OS is only slightly larger and heavier than the 105VR, and like the latter one can be used free handed, but when tripod is needed, the 150 is much more practical than the 105 Vr thanks to the tripod collar.
With respect to the Nikon 200 micro AfD, the Sigma 150 is shorter (but slightly wider), however both show excellent ergonomy.
The three competitors, without (above) and with (below) the hood. Notice the little difference in size between the Sigma 150 and Nikon 105VR.
For a macro, it is suprisingly fast, I would say a little better than the Nikon 105VR and another world with respect to the Nikon 200 micro AfD still retains the archaic mechanical-geared Af. Great performance (for a macro lens).
The focusing ring is adequate in size and well damped, perfectly usable, the only (little) flaw, as in many other "fast focusing" macro lenses, is that it takes only few mm of rotation to go from 3m to infinity, thus it becomes difficult focusing manually outside the macro area.
The possiblity of manual focus override without fiddling with switches is a great advantage over the Nikon 200m micro AfD.
It works well. It may "jump" a little when started, but then all is steady. At higher reproduction ratios the usefulness of stabilization decreases as usual.
- ago 09 2015 09:43
- da Silvio Renesto