Instruction/ maintenance manual of the product APO-TELYT-R Leica
Go to page of 11
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.
An important point after buying a device Leica APO-TELYT-R (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Leica APO-TELYT-R yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Leica APO-TELYT-R - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Leica APO-TELYT-R you will learn all the available features of the product, as well as information on its operation. The information that you get Leica APO-TELYT-R will certainly help you make a decision on the purchase.
If you already are a holder of Leica APO-TELYT-R, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Leica APO-TELYT-R.
However, one of the most important roles played by the user manual is to help in solving problems with Leica APO-TELYT-R. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Leica APO-TELYT-R along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
