LeicaメーカーAPO-TELYT-Rの使用説明書/サービス説明書
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Leica R-Lenses Sept ember 2003 Chapt er 3: 1 80 mm and 280 mm lenses __ LEICA APO-ELMARIT-R 1 80 mm f/2.8 __ LEICA APO-TEL Y T -R 280 mm f/4 b y E rw in P u t s.
Chapt er 3 Leica R-Lenses 1 T elephot o lenses hav e a long tradition at Leica. The first 20 cm f/4.5 T elyt lens was introduced as long ago as 1 935 for the Leica rangefinder camera. An additional mirror reflex housing was required for the accurate determination of t he field of view and the focus.
Chapt er 3 Leica R-Lenses 2 In 1 975 Leitz Canada designers computed t he 1 80 mm f/3.4 Apo-T elyt-R lens for scientific purposes that required a very high information content. It is a seven-element syst em with four groups, corrected for the infrared region and it perfor ms best at infinity.
Chapt er 3 Leica R-Lenses 3 In 1 993 the 280 mm f/4 Apo-T elyt-R was introduced. P er for- mance was improved, especially in the out er zones; the weight was reduced to 1 8 75 grams (66. 1 ounces) and t he price ratio of 4.8:1 was much better . In terms of per formance, both new lenses, t he 1 80 mm f/2.
Chapt er 3 Leica R-Lenses 4 With these considerations it is possible to create and define the image effects that y ou want. If the main subject is encircled by objects in the fore- and bak- kground, y.
Chapt er 3 Leica R-Lenses 5 Atmospheric turbulence and heat wa ves can destro y the image quality at t hese large magnifications and one needs a skylight filter with color film and a medium orang e filter with black -and- white film.
Chapt er 3 Leica R-Lenses 6 Flare and secondary images are absent and specular highlights in the blazing sun are free from halo effects. Vignetting may be visible under critical circumstances (wide open), but it is eliminated at f/5.
Chapt er 3 Leica R-Lenses 7 The diverging cur ves at 40 Lp/mm for sagittal and tangential lines is of no relevance in practical phot ography . This reduction in contrast can only be computed; it is not visible in real life. This behavior indicates that the lens earns highest scores for color correction.
Chapt er 3 Leica R-Lenses 8 Even so, the optical quality of the 280 mm lens is higher . Here we can detect the limit of the MTF graphs when w e restrict our- selves t o 40 Lp/mm as the highest frequency.
Chapt er 3 Leica R-Lenses 9 Y ou will have t o find subjects that have e xtremely fine details t o start with, and then you must tak e pictures at quite a large distance, because y ou need a high value of negativ e magnifica- tion, and t hen you must enlarge the tiny negative to big propor- tions.
Chapt er 3 Leica R-Lenses 10 __ Summar y In the roaring twenties there was a 540 SSK Mercedes Benz sports car with a turbo-charg ed engine. The turbo charg er could only be used for a few minutes, other- wise it w ould overheat the engine. But the driving e xperience was breathtakingly exilarating.
デバイスLeica APO-TELYT-Rの購入後に（又は購入する前であっても）重要なポイントは、説明書をよく読むことです。その単純な理由はいくつかあります：
Leica APO-TELYT-Rをまだ購入していないなら、この製品の基本情報を理解する良い機会です。まずは上にある説明書の最初のページをご覧ください。そこにはLeica APO-TELYT-Rの技術情報の概要が記載されているはずです。デバイスがあなたのニーズを満たすかどうかは、ここで確認しましょう。Leica APO-TELYT-Rの取扱説明書の次のページをよく読むことにより、製品の全機能やその取り扱いに関する情報を知ることができます。Leica APO-TELYT-Rで得られた情報は、きっとあなたの購入の決断を手助けしてくれることでしょう。
Leica APO-TELYT-Rを既にお持ちだが、まだ読んでいない場合は、上記の理由によりそれを行うべきです。そうすることにより機能を適切に使用しているか、又はLeica APO-TELYT-Rの不適切な取り扱いによりその寿命を短くする危険を犯していないかどうかを知ることができます。
ですが、ユーザガイドが果たす重要な役割の一つは、Leica APO-TELYT-Rに関する問題の解決を支援することです。そこにはほとんどの場合、トラブルシューティング、すなわちLeica APO-TELYT-Rデバイスで最もよく起こりうる故障・不良とそれらの対処法についてのアドバイスを見つけることができるはずです。たとえ問題を解決できなかった場合でも、説明書にはカスタマー・サービスセンター又は最寄りのサービスセンターへの問い合わせ先等、次の対処法についての指示があるはずです。
