Leica APO-MACRO-ELMARIT 100 mm f/2.8 Скачать руководство пользователя страница 1 | Manualshive

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Leica R-Lenses

August 2003
Chapter 2: 80 mm and 100 mm lenses

__ LEICA SUMMILUX-R 80 mm f/1.4
__ LEICA APO-SUMMICRON-R 90 mm f/2 ASPH.
__ LEICA APO-MACRO-ELMARIT 100 mm f/2.8

by Erwin Puts

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Содержание APO-MACRO-ELMARIT 100 mm f/2.8

Страница 1: ...Leica R Lenses August 2003 Chapter 2 80 mm and 100 mm lenses __ LEICA SUMMILUX R 80 mm f 1 4 __ LEICA APO SUMMICRON R 90 mm f 2 ASPH __ LEICA APO MACRO ELMARIT 100 mm f 2 8 by Erwin Puts ...

Страница 2: ...he minimum distance of distinct vision of 250mm The angle of view is now about 50 degrees and this corresponds to the angle of view of a 50mm lens 45 47 degrees But this mini mum distance is very often quite uncomfortable in many situa tions You may not be able to view the whole picture at once without moving your eyes and the distance of 250mm is quite short if you are above 20 years old Many stu...

Страница 3: ...parate thick elements at the rear end As with the 60mm macro lens the computation is designed for universal usage When focusing the lens the whole front lens with six elements moves and the rear group is stationary The apochromatic cor rection is very important when slides or negatives need to be magnified substantially The disturbing color fringes are elimi nated because of the reduction of the s...

Страница 4: ...ailable The optical construction shows a five single elements and the first surface of the third lens has the aspherical shape True mastery can be seen in this elegant design Some time ago one needed seven or eight lens elements and could not get this high performance The low number of elements the choice of glas ses for transparency and color transmission the effective type of coating all work to...

Страница 5: ... observer is close to the screen where he should not be to be honest The Summilux R shows some characteristics that are not visible at all at smaller magnifications From aperture 2 8 all three may be considered equal in image quality The performance of the Summilux is in absolute terms excellent and should be related to the very high speed It is not always the case that a very high speed lens can ...

Страница 6: ...ocusing is fast and accurate The speed of focusing can be improved when you pre focus at the anticipated distance and move the camera slightly to and from the subject for fine tuning without larger focusing movements The true focus snaps into position on the bright screen Distortion is surprisingly low with only 0 2 and is even suitable for architectural photography Vignetting is relativley high w...

Страница 7: ...o capture scenes in low light situations that are intere sting moving or informative documentary in character For this kind of photography the Summilux is eminently suited The per formance wide open is better than can be captured on modern high speed emulsions Stopped down to 1 2 the overall con trast improves visibly as internal reflections are effectively reduced Aperture 2 8 again improves cont...

Страница 8: ...with all three lenses at all apertures on ISO100 slide film The distinctive differences as described above can be seen only when the magnification is 20 times or more You should also take care of your photographic technique Wrong focusing distance and a slight movement of the camera create more loss in the picture quality than the inherent optical cha racteristics The unsharpness gradient is quite...

Страница 9: ... requi rements The Apo Summicron R 1 2 90mm ASPH is such a lens It is really difficult to criticize this lens At full aperture the performance is already as good as that of the Apo Macro Elmarit R 1 2 8 100mm at aperture 2 8 For an aperture of 1 2 this is a most remarkable feat More important perhaps is the transparency of the colors and the clarity of the details Extremely fine details are reprod...

Страница 10: ...apertures the internal reflections are reduced and the extreme edge rays are blocked If you look carefully you may see the result of the diffraction at aperture 5 6 the overall contrast for the 5Lp mm is slightly reduced compared to the values at 2 8 Distortion is low with 1 but may be visible on critical inspec tion and suitable subjects The Summilux is better here 0 5 10 15 20 Y mm 0 20 40 60 80...

Страница 11: ...n be detected in strong back light and large areas of sky that work as a light box At distances below 1 5 meter the definition of very fine structures softens a bit at the wider apertures Stopping down to 5 6 will save the day Using the Apo Extender R 2x you get a very fine 4 180mm lens that should be stopped down to smaller apertures at distances below 2 5 meter for best quality These remarks sho...

Страница 12: ...this cha racter too The Apo Macro Elmarit R 1 2 8 100mm is such a lens In direct comparison to the Apo Summicron R 1 2 90mm ASPH the maximum aperture is slower by a stop the perfor mance over the entire distance range uniformly high These parameters define the choice If the near focusing range 1 meter to 20cm is not important the Apo Summicron R is the better choice better ergonomics less weight a...

Страница 13: ...the plane of best focus shifts a little bit Often this shift will be compensated with a correction state that plays out third and fifth degree spherical aberration But then contrast drops a bit too at full aperture The Apo Macro Elmarit R has hardly any spherical aberration and already a high contrast at full aperture Then you will see a slight focus shift more easily You should also look at the d...

Страница 14: ...t drop in contrast at the wider apertures and when maximum magnifi cation is required you could stop down to the middle and smal ler apertures The Apo Extender 2 creates a focal length of 200mm and an aperture of 5 6 This is fine for emergency situations but the relatively small aperture will not give much pleasure You sometimes can read the statement that the Apo Macro Elmarit R is too sharp for ...

Страница 15: ...e photographic language The performance at 1 2 boosts the available light photography with current high speed films The photographer who needs or wants to make documentary and emotional pictures at very wide apertures and expects excellent quality in all lighting situations and at smaller apertures should look at the Summilux R 1 1 4 80mm Versatile usability outstanding performance at all aperture...

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