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A good user manual
The rules should oblige the seller to give the purchaser an operating instrucion of Leica 11646, 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 11646 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 11646. 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 11646 should contain:
- informations concerning technical data of Leica 11646
- name of the manufacturer and a year of construction of the Leica 11646 item
- rules of operation, control and maintenance of the Leica 11646 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 11646 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 11646, 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 11646.
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 11646 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 90 mm f/2.5 1 The LEICA SUMMARIT-M 90 mm f/2.5 is a v ersatile telephoto lens that rounds off the new lens speed class of Summarit-M len- ses. Despite being much more handy and lighter than t he comparable 90 mm Summicron lens, it of fers outstanding optical and mechanical quality . Even at full aperture, this lens demonstr ates e[...]
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Page 2
LEICA SUMMARIT -M 90 mm f/2.5 2 For 35 mm (2 4 x 36 mm) : 27°, 22,6°, 1 5,2°, f or LEICA M8 (1 8 x 27 mm): 20,4°, 1 7 . 1°, 1 1.4°, corresponds to a focal length of appro x. 1 20 mm with 35 mm-format Number of lenses/groups: 5 / 4 Focal length: 9 1.0 mm Position of entrance pupil: 5 4 ,8 mm (related t o the fir st lens surface in light direct[...]
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Page 3
LEICA SUMMARIT -M 90 mm f/2.5 3 0 5 10 15 20 Y' [mm] = 2 1 .0000 0 20 40 60 80 10 0 [%] Aperture Stop 2.5 0 5 10 15 20 Y' [mm] = 2 1 .0000 0 20 40 60 80 10 0 Aperture Stop 5.6 [%] 0 5 10 15 20 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 long taking[...]
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Page 4
LEICA SUMMARIT -M 90 mm f/2.5 4 Distortion Vignetting 0 5 10 15 20 Y' [mm] = 2 1 .0000 -5 -4 -3 -2 -1 0 1 2 3 4 5 [%] Relative Dis tor tion 0 5 10 15 20 Y' [mm] = 2 1 .0000 0 20 40 60 80 10 0 [%] Vignetting 2.5 4.0 5.6 0 3 6 9 12 15 18 X'[mm] 0 3 6 9 12 Y'[mm] Ef f ective Distortion Distortion is the deviation of the real image [...]
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Page 5
LEICA SUMMARIT -M 90 mm f/2.5 5 Depth of field table Magnification 1 0,991 - 1,009 0,990 - 1,010 0,986 - 1,015 0,980 - 1,021 0,972 - 1,030 0,962 - 1,042 0,945 - 1,062 1/8,9 1,2 1,186 - 1,214 1,185 - 1,215 1,179 - 1,222 1,171 - 1,231 1,159 - 1,244 1,144 - 1,262 1,121 - 1,292 1/11,1 1,5 1,479 - 1,522 1,477 - 1,524 1,467 - 1,535 1,454 - 1,549 1,435 - [...]
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Page 6
LEICA SUMMARIT -M 90 mm f/2.5 6 Aperture Stop 8 0 5 10 15 20 25 30 35 40 45 50 ∞ 10 5 3 2 1,5 1,2 1 Distance Setting [m] Depth of Field [m] Aperture Stop 4 0 5 10 15 20 25 30 35 40 45 50 ∞ 10 5 3 2 1,5 1,2 1 Distance Setting [m] Depth of Field [m] Aperture Stop 5,6 0 5 10 15 20 25 30 35 40 45 50 ∞ 10 5 3 2 1,5 1,2 1 Distance Setting [m] Depth[...]
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Page 7
LEICA SUMMARIT -M 90 mm f/2.5 7 Leica Camera AG / Osk ar- Barnack- Straße 1 1 / D - 35606 Solms / T elefon + 49 (0) 6442- 208 - 0 / T elefax + 49 (0) 6442 - 208- 333 www.leica- camera.com / info @leica - camera.com Aperture Stop 11 0 5 10 15 20 25 30 35 40 45 50 ∞ 10 5 3 2 1,5 1,2 1 Distance Setting [m] Depth of Field [m] Aperture Stop 16 0 5 10[...]