Buying the chamber with replaceable optics, we win in universality, but we doom Itself on necessity of search and a choice of objectives. And this choice is not less combined, Than a choice of the chamber. It is not complex to be defined with those parameters of an objective, which By letters are put on its case. But whether there will be an image sharp, beautiful outside of Focus, whether it will be vectorially deformed and on color, it on an objective not It is written. Only pictures allow to estimate - the objective will approach or not. The Focal length and a relative aperture - that defines functional Purpose of optics. Conditionally on this purpose all optics can be divided on Some classes. SIGMA - 3 mm f/4-f/5, II MACRO SUPER - belong This objective its price is. It is hp pavilion zt3000 notebook possible to tell, that it defines Its position in a ruler of optics of firm, as it is necessary to buy to try. This objective actually is good or bad? We shall try to understand. On functionality an objective - dlinnofokusny'y and an autofocal zoom with an opportunity Macroshootings up to scale 1: on the maximal focal length of 3 mm. Relative Focusings of 1, m in a usual mode and 0, m in makro. The only thing In a range 1 - 3 mm. The design looks quite reliably. That obviously does not suffice - a boot for fastening Objective to a support. A sound of work of the motor of focusing, speed of focusing and Is issued with fastening under Sigma AF, Canon EF, Nikon AF, Konica-Minolta and Pentax AF), but it is the price of the price. The firm optics costs in times more. The most unpleasant It is necessary to note, it is quite reliable. Other serious claims to a design new The objective is not present. From those who uses similar objectives for a long time, it hp pavilion zt3000 notebook was necessary To hear about that the objective in due course becomes loose. But for a year Operation of it does not happen, and greater to demand from an inexpensive design Unfairly. Official data At Sigma not so long ago there was pleasant in every respect a Russian-speaking page The part is taken partly therefrom and from the paper instruction. Not all coincides at these Two sources, in case of discrepancy the priority was at the paper instruction. Characteristics: the Design: elements in groups the Corner of the review: 34, - 8, degrees of Petals of a diaphragm: Minimal diaphragm: f/ - f/ the Minimal distance of focusing: 1 sm / sm (?a�O�) the Maximal increase: 1:4, / 1: (?a�O�) Diameter under an optical filter: mm the Sizes, mm: d h L 119, Weight, g: 555 (Contrast on a field of the staff) for focal lengths of mm and 3 mm, a diaphragm It is as much as possible opened, a red curve � frequency liniy/mm, green - 30 On radial lines the worlds), dotted - for beams in (it is defined on lines the worlds perpendicular radial). hp pavilion zt3000 notebook A design At change of a focal length at an objective move forward and back All management of an objective - two rings (focusings and a zoom), the switch of a macromode And the switch of focusing automatic / manual. Quality of the image For an estimation of quality of the image by the chamber with objective SIGMA - 3 mm f/4-f/5, II MACRO SUPER it was made Established on a support, descent of a shutter - by means of remote control. Adjustment of a photosensitivity - e`kv. ISO 100. At each installation of adjustments it was done on three staff, the best got out of them. Format of shooting RAW, all the important illustrations are received by converting RAW in JPEG With a degree of quality of 1 % ( in Photoshop). References under pictures allow To copy the full staff received hp pavilion zt3000 notebook by converting in JPEG with adjustment of quality in Photoshop. Shooting on location Focusing in all cases was made on the left pipe, a zone noted red Fragments two variants (from three pictures) are resulted. At constant focusing And identical quality in the center, at edges of the staff the image can is essential 1/10 with, f/8. Shooting of a target the Target is printed on a leaf of format A3. Fragment 1:1, the center of the staff f = mm, f/4. A fragment 1:1, f = mm, f/4, radial The world - the right top edge of the staff, ring - left bottom. Fragment 1:1, the center of the staff f = mm, f/5,6. A fragment 1:1, f = mm, f/5,6, radial The world - the right top edge of the staff, ring - left bottom. Fragment 1:1, the center of the staff f = mm, f/8. A fragment 1:1, f = mm, f/8, radial The world - the right top edge of the staff, ring - left bottom. Fragment 1:1, the center of the staff f = mm, f/22. A fragment hp pavilion zt3000 notebook 1:1, f = mm, f/22, radial The world - the right top edge of the staff, ring - left bottom. The world - the right top edge of the staff, ring - left bottom. The world - the right top edge of the staff, ring - left bottom. 1:2. At installation of an objective on the film chamber on the long party of the staff Pictures f = mm, f/8, f = 1 mm, f/8, f = 3 mm, f/8. That who is limited in means, objective SIGMA - 3 mm f/4-f/5, II MACRO SUPER will be the present gift. A range of focal lengths - 3 mm- There is enough both for a portrait and for photohunting. For a portrait, all over, in view of rather Small relative aperture - f/4. We shall note, that it is possible to hp pavilion zt3000 notebook get and more opticheski the perfect and more dear variant of objective AF - 3 mm f/4-f/5, APO MACRO SUPER II. Sergey ShCherbakov (across Moscow the price, actual at the moment of reading of the given clause by you: SIGMA - 3 mm f/4-f/5, II MACRO SUPER (for Canon AF) $1 (6) Comments? Amendments? Additions? Discussions in conference:

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