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A good user manual
The rules should oblige the seller to give the purchaser an operating instrucion of Leica Summarit M 35 / 2,5, along with an item. The lack of an instruction or false information given to customer shall constitute grounds to apply for a complaint because of nonconformity of goods with the contract. In accordance with the law, a customer can receive an instruction in non-paper form; lately graphic and electronic forms of the manuals, as well as instructional videos have been majorly used. A necessary precondition for this is the unmistakable, legible character of an instruction.
What is an instruction?
The term originates from the Latin word „instructio”, which means organizing. Therefore, in an instruction of Leica Summarit M 35 / 2,5 one could find a process description. An instruction's purpose is to teach, to ease the start-up and an item's use or performance of certain activities. An instruction is a compilation of information about an item/a service, it is a clue.
Unfortunately, only a few customers devote their time to read an instruction of Leica Summarit M 35 / 2,5. A good user manual introduces us to a number of additional functionalities of the purchased item, and also helps us to avoid the formation of most of the defects.
What should a perfect user manual contain?
First and foremost, an user manual of Leica Summarit M 35 / 2,5 should contain:
- informations concerning technical data of Leica Summarit M 35 / 2,5
- name of the manufacturer and a year of construction of the Leica Summarit M 35 / 2,5 item
- rules of operation, control and maintenance of the Leica Summarit M 35 / 2,5 item
- safety signs and mark certificates which confirm compatibility with appropriate standards
Why don't we read the manuals?
Usually it results from the lack of time and certainty about functionalities of purchased items. Unfortunately, networking and start-up of Leica Summarit M 35 / 2,5 alone are not enough. An instruction contains a number of clues concerning respective functionalities, safety rules, maintenance methods (what means should be used), eventual defects of Leica Summarit M 35 / 2,5, and methods of problem resolution. Eventually, when one still can't find the answer to his problems, he will be directed to the Leica service. Lately animated manuals and instructional videos are quite popular among customers. These kinds of user manuals are effective; they assure that a customer will familiarize himself with the whole material, and won't skip complicated, technical information of Leica Summarit M 35 / 2,5.
Why one should read the manuals?
It is mostly in the manuals where we will find the details concerning construction and possibility of the Leica Summarit M 35 / 2,5 item, and its use of respective accessory, as well as information concerning all the functions and facilities.
After a successful purchase of an item one should find a moment and get to know with every part of an instruction. Currently the manuals are carefully prearranged and translated, so they could be fully understood by its users. The manuals will serve as an informational aid.
Table of contents for the manual
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Page 1
LEICA SUMMARIT -M 35 mm f/2.5 1 The LEICA SUMMARIT-M 35 mm f/2.5 giv es all users of rangefinder cameras with a Leica M bayone t access to the smallest and lightest 35 mm lens available, offering the outstanding imag e quality that is the hallmark of all Leica M lenses. In the Leica M system the 35 mm lens is used b y many as the standard focal len[...]
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Page 2
LEICA SUMMARIT -M 35 mm f/2.5 2 Engineering drawig T echnical Data Angle of view (diagonal, horizontal, v ertical) Optical design Distance setting Aperture Bay onet Filter mount/Lens hood Dimension and weight For 35 mm (2 4 x 36 mm) : 63°, 54°, 38°, for LEICA M8 (1 8 x 2 7 mm) : 50°, 42°, 29°, corresponds to a focal length of appro x. 47 mm w[...]
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Page 3
LEICA SUMMARIT -M 35 mm f/2.5 3 05 1 0 1 5 2 0 Y' [mm] = 2 1 .0000 0 20 40 60 80 10 0 [%] Aperture Stop 2.5 05 1 0 1 5 2 0 Y' [mm] = 2 1 .0000 0 20 40 60 80 10 0 Aperture Stop 5.6 [%] [] 05 1 0 1 5 2 0 Y' [mm] = 2 1 .0000 0 20 40 60 80 10 0 [%] Aperture Stop 4.0 MTF graphs The MTF is indicated both at full aperture and at f/5.6 at lo[...]
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Page 4
LEICA SUMMARIT -M 35 mm f/2.5 4 Distortion Vigneting 05 1 0 1 5 2 0 Y ' [mm] = 21 0 0 0 0 -5 -4 -3 -2 -1 0 1 2 3 4 5 [%] Relative Dist or tion 05 1 0 1 5 2 0 Y' [mm] = 2 1 .0000 0 20 40 60 80 10 0 [%] Vignetting 2.5 4.0 5.6 0369 1 2 1 5 1 8 X'[mm] 0 3 6 9 12 Y'[mm] Ef fective Distortion Distortion is the deviation of the real im[...]
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Page 5
LEICA SUMMARIT -M 35 mm f/2.5 5 Depth of field table Magnification 1 0,944 - 1,063 0,938 - 1,072 0,913 - 1,106 0,883 - 1,155 0,841 - 1,238 0,795 - 1,361 0,728 - 1,635 1/26,0 1,2 1,119 - 1,294 1,110 - 1,307 1,076 - 1,359 1,033 - 1,435 0,976 - 1,568 0,912 - 1,775 0,824 - 2,282 1/31,7 1,5 1,373 - 1,653 1,360 - 1,674 1,308 - 1,762 1,244 - 1,895 1,160 -[...]
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Page 6
LEICA SUMMARIT -M 35 mm f/2.5 6 Aperture Stop 8 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 ∞ 10 5 3 2 1,5 1,2 1 Distance Setting [m] Depth of Field [m] Aperture Stop 4 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 ∞ 10 5 3 2 1,5 1,2 1 Distance Setting [m] Depth of Field [m] Aperture Stop 5,6 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1[...]
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Page 7
LEICA SUMMARIT -M 35 mm f/2.5 7 Leica Camera AG / Osk ar- Barnack- Straße 1 1 / D- 35606 Solms / T elefon + 49 (0) 6442 - 208- 0 / Telefax + 49 (0) 6442- 208- 333 www.leica- camera.com / info@leica - camera.com Aperture Stop 11 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 ∞ 10 5 3 2 1,5 1,2 1 Distance Setting [m] Depth of Field [m] Apert[...]