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Leica R-Lenses

January 2004
Chapter 7: 28-90 mm lens

__ LEICA VARIO-ELMARIT-R 28-90 MM F/2.8-4.5 ASPH

by Erwin Puts

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Содержание R-Lenses

Страница 1: ...Leica R Lenses January 2004 Chapter 7 28 90 mm lens __ LEICA VARIO ELMARIT R 28 90 MM F 2 8 4 5 ASPH by Erwin Puts...

Страница 2: ...ner of a zoomlens has more tools to correct the lens but the mechanical design and engineering are more demanding There is clearly a difference between assem bling a lens with 6 elements in a stationa...

Страница 3: ...quality medium speed films One would have hoped for a slightly wider aperture at the telephoto side of the zoomrange But that wish would have clashed with the desire for a compact lens Remember that...

Страница 4: ...is still incredibly small And the designer must be aware of this jump to assure that his calculations can be met in the realm of manual assembly even when using sophisticated instruments to check the...

Страница 5: ...assembly practice No two lenses that leave the factory are absolutely identi cal There is always some tolerance during manufacture The factory must set the lower limits of the performance that they c...

Страница 6: ...ge 8 and 10 At 5 6 we have impeccable performance that easily surpasses the quality of the Summicron 50 mm lens especially in the outer zones of the field see image 9 At 70 mm and full aperture 4 the...

Страница 7: ...60 80 100 Aperture Stop 5 6 image 5 image 6 0 5 10 15 20 Y mm 5 4 3 2 1 0 1 2 3 4 5 Relative Distortion image 7 0 5 10 15 20 Y mm 0 20 40 60 80 100 Aperture Stop 3 4 0 5 10 15 20 Y mm 0 20 40 60 80 1...

Страница 8: ...0 80 100 Aperture Stop 5 6 image 11 image 12 0 5 10 15 20 Y mm 5 4 3 2 1 0 1 2 3 4 5 Relative Distortion image 13 0 5 10 15 20 Y mm 0 20 40 60 80 100 Aperture Stop 4 5 0 5 10 15 20 Y mm 0 20 40 60 80...

Страница 9: ...higher speed per focal length Stopped down there is no longer a big difference and compared to older lens generations the zoomlens often has better imagery in the outer zones of the image The images m...

Страница 10: ...ect confrontation with the sun In general I would say that for veiling glare the lens is better than the average Leica lens and for secondary reflections it is slightly better __Conclusion The new len...

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