Leica APO-Summicron-M 50mm f/2.0 ASPH Lens

The Leica APO-Summicron-M 50mm f/2.0 ASPH Lens represents a true milestone in photographic lens development. You need look no further than the MTF chart to understand what makes this piece of equipment so significant: At an aperture of f/5.6, the lines for both tangential and sagittal structures are absolutely flat–meaning the lens has no image degradation whatsoever. The graphs for f/2.0 and f/2.8 are highly impressive, as well. This is an achievement previously believed by many to be impossible in the field of optics. Even the finest of details are resolved with greater than 50% contrast across the entirety of the image field. Vignetting is restricted to a mere 2 stops at full aperture in 35mm format, equivalent to about 1 on Leica’s M8 models, and stopping down to f/2.8 visibly minimizes this light deterioration towards the image’s edges, with virtually none but the natural vignetting remaining. At a maximum of 0.4% (pin cushion), distortion is so low, it’s practically imperceptible. Eight lens elements combine to realize this exceptional performance. Every image you capture with this APO-Summicron-M lens–in any photographic situation–will demonstrate extreme sharpness and resolution throughout, providing you all the validation you need to know that you’ve made a superior choice. Plus, the lens’ apochromatic correction reduces chromatic aberration on sharp edges to deliver the most natural rendition of each detail. The result? You enjoy the best possible reproduction results at any and all print sizes. To enable such apochromatic correction, which produces a common focusing plane for 3 light wavelengths, 3 of the 8 lens elements are constructed of glass with high anomalous partial color dispersion, while 2 of the remaining 5 feature a high refractive index. In the rear group, the first lens’ aspherical surface works to minimize spherical aberration and flatten the image field. Optical construction is Gaussian type, while the arrangement of lens elements resembles that of the Summilux-M 1:1.4/35 mm ASPH. This group, located behind the diaphragm, comprises the floating element that moves independently of the others in focusing, altering position relative to the front group, to ensure that the lens delivers incredible image quality throughout its focus range–even at the closer focusing distances. To realize the stunning apochromatic correction, it was necessary to utilize specially-formulated glasses based upon original creations of the former Leitz glass lab. Leica understands that the process of working with these glasses is truly a fine art, which is why they have been integrated so expertly into this Summicron lens. The lens’ design is based on that of its predecessor, with the 50mm focal length and maximum f/2.0 aperture serving as the foundation for the rest of the development. With a compact body only slightly longer and heavier than the Summicron-M 1:2/50mm, and with an almost identical diameter, this lens delivers noticeably superior image quality. In the 30 years since the launch of the 1:2/50mm, Leica has accomplished a lot–but this is certainly one of their crowning achievements. This groundbreaking lens is the culmination of 150 years of hard work. The APO-Summicron-M 50mm owes its unparalleled performance to the perfect interaction of all design and construction elements–from optical calculation to selection of materials to highly sophisticated and elaborate manufacturing and finishing. Constructed completely by hand in Germany, and composed of only the best materials, the APO-Summicron-M 50mm f/2.0 ASPH Lens is a testament to the amazing achievements that are possible when advanced technology, vast knowledge, and meticulous, expert craftsmanship collide. Image Degradation: Going, Going–Gone A glance at the MTF chart illuminates what makes this lens so significant: While the graphs for f/2.0 and f/2.8 apertures are highly impressive, at an aperture of f/5.6, the lines for both tangential and sagittal structures are absolutely flat–meaning the lens has no image degradation whatsoever High Contrast Even the finest of details are resolved with greater than 50% contrast across the entirety of the image field Minimal Vignetting Vignetting is restricted to a mere 2 stops at full aperture in 35mm format, equivalent to about 1 on Leica’s M8 models, and stopping down to f/2.8 visibly minimizes this light deterioration towards the image’s edges, with virtually none but the natural vignetting remaining Low Distortion At a maximum of 0.4% (pin cushion), distortion is so low, it’s practically imperceptible Apochromatic Correction Lens’ apochromatic correction reduces chromatic aberration on sharp edges to deliver the most natural rendition of each detail. The result? You enjoy the best possible reproduction results at any and all print sizes Special Glass Construction To enable such apochromatic correction, which produces a common focusing plane for 3 light wavelengths, 3 of the 8 lens elements are constructed of glass with high anomalous partial color dispersion, while 2 of the remaining 5 feature a high refractive index. Specially-formulated glasses based upon original creations of the former Leitz glass lab have been integrated expertly into this lens Unparalleled Image Quality Throughout The Focus Range In the rear group, the first lens’ aspherical surface works to minimize spherical aberration and flatten the image field. Optical construction is Gaussian type, while the arrangement of lens elements resembles that of the Summilux-M 1:1.4/35 mm ASPH. This group, located behind the diaphragm, comprises the floating element that moves independently of the others in focusing, ensuring that the lens delivers incredible image quality throughout its focus range–even at the closer focusing distances Trumps The Summicron-M 1:2/50mm With a compact body only slightly longer and heavier than the Summicron-M 1:2/50mm, and with an almost identical diameter, this lens delivers noticeably superior image quality How It’s Done This groundbreaking lens is the culmination of 150 years of hard work on the part of Leica. APO-Summicron-M 50mm owes its unparalleled performance to the perfect interaction of all design and construction elements–from optical calculation to selection of materials to highly sophisticated and elaborate manufacturing and finishing. Constructed completely by hand in Germany SKU: #11141 Categories: Leica M, Leica M Lenses, Photography

Warranty policy

All products are backed by unlimited mileage and one (1) Year, Limited Warranty. Please read terms and conditions for full description.

Before fitting the new part, you MUST find the reason why turbocharger FAILED and CORRECT it. Fitting a new turbo will only result the same failure. Less than 10% of turbocharger failures, are due to the turbo itself, in most cases failures are caused by outside influence. Most common causes of consequential failure (NOT COVERED BY WARRANTY) are listed below. All new Kott Turbo Works products are backed by a one (1) Year Limited Warranty. The one (1) Year Limited Warranty covers all manufacturer defects. Warranty does not cover labor recovery, accommodation, or any other costs. Turbochargers must be returned for a detailed warranty inspection. Any modification to the product voids the one (1) Year Limited Warranty. The one (1) Year Limited Warranty does not cover :

Failure to provide installation documents from repair facility. (Self/parking lot installs)
Failure to perform and document scheduled maintenance on time.
Seaping/leaking oil out of compression outlet, caused by excesive BLOW BY or clogged crankcase FILTER.
Failures due to Improper installation or maintenance, restricted oil feed pipe, damaged oil pump, low oil level, metal particles or carbon present, faulty DPF filters and/or EGR valves, contaminated lubricant, oil starvation.
Using liquid gasket or sealing compounds
White deposit present on exhaust parts due to excessive engine oil burn.
Over speeding, defective intercooler and or compression piping, stuck VGT, Remap
Foreign object and physical damage, defective or dirty air filter and supply pipes.

Due to the intricacies involved in warranty process and the industry standard protocol regarding the inspection of parts and turnaround time, we will not offer free replacements prior to full inspection and analysis. To minimize potential downtime for our customers, we strongly recommend the purchase of replacement parts as a proactive measure. We kindly request your understanding in this matter.

Core return

Cores must be returned in undamaged shipping conditions, if damage occurs during shipping, due to poor packaging or other reasons we reserve the right to prorate or forfeit core refund at our discretion.

Cores must be returned within 60 days for full core refund and it has to meet all criteria, after that core refund will be at KTW discretion. Upon receiving your good core, we will issue a refund within a 1 week period. All cores are subject to inspection upon arrival. Any returned item with physical damage will result in denial of return credit or refund. The Following are examples of Turbos that will NOT be refunded:

Turbochargers: Bent or broken anything except turbine shaft. Bent, broken or damaged housing.
Core has to be sent with copy of purchase order, in order to know for which turbo we have to issue the refund, KTW won’t know who returned it, without proper documentation.
Core must be like-for-like.

We provide free return shipping using a FREE FedEx return label to return the core back to us, from most of the locations in the US (excluding Alaska, Hawaii, and Puerto Rico).

Shipping and returns

We use FedEx ground for shipping, contact us for expedited service, or other special arrangements.

We usually ship the same day, unless item is out of stock due to local in store purchase, you can call/text us at 331-888-8726 to check availability and place 12 hours hold status on item.

If your order has shipped, the return and restocking fee is 20%. Customer must pay for return shipping. Shipping from when the product was sent out is not refunded as that cost has been spent and is unrecoverable. Returns are only allowed for 14 days from post marked day, after that only store credit can be allowed at our discretion, not guaranteed.

Installation tips

Most common misdiagnosis.

Oil leaks can be caused by a variety of factors, the main factor being incorrect pressure within the compressor and turbine housings, which is usually caused by:

Blockages to the air intake filter and/or hoses.
Excessive crank case pressure (blow-by from worn piston rings/bores)
Blockages in the exhaust system
Repeated hot engine shutdowns leading to carbon deposits (coke) in the centre housing
Dirty crankcase filter
Use of silicon sealant / incorrect gasket, twisted, bent or trapped oil return pipe

Most common turbocharger failure causes on semi trucks:

Foreign object damage – Broken off engine components, e.g. valves (D13), fragments of damaged pistons or injector tips, EGR block off plates.
Oil contamination – High carbon build up present in the engine can quickly contaminate new oil, contamination of new oil while servicing.
Degrading oil – excessive temperatures or extended service intervals.
Internal engine leaks – fuel or coolant mixing with oil supply.
Turbocharger overspeeding – Engine modifications including ‘chipping’ or ‘over-fuelling, bad program installed if EGR/DPF delete was performed, worn injectors. Tear in the air hose or the hose becoming completely detached. Restrictions in the air intake filter or pipe work. Air leaks between compressor and engine.
Lack of lubrication –

1. Engine left idle for long periods, especially during cold weather
2. Oil feed pipes containing bends or kinks
3. Lack of maintenance, oil change intervals should be shortened as engine gets old.
4. Insufficient oil in the sump
5. Incorrect oil inlet gasket used leading to restriction in oil supply
6. Build-up (coking) / carbon deposits in the oil feed pipe
7. Applying silicone to the oil inlet gasket causing blockages
8. Sludge or coke build up in bearing housing from hot shutdowns
9. Failure to prime the turbo with oil before initial run