Check the listing for details. LOMO 18mm OKC5-18-1 replacement doublet. Condition: New. Listed at 290.00 USD. Up for sale is a newly manufactured replacement doublet for the LOMO 18mm OKC5-18-1 lens. Crafted using advanced reverse engineering techniques, this doublet is designed to replace the optical blocks in most LOMO OKC5-18-1 lenses, which often suffer from cracked doublets. Our production process meticulously replicates the original doublet’s features, including its coating. However, it's important to note that, due to the absence of the original formula from over 40 years ago, the replication isn't a 100% match. This doublet is ideal for those looking to restore the integrity of their LOMO OKC5-18-1 lenses. However, buyers must be aware that precise installation knowledge is crucial. Incorrect replacement can disrupt the optical centering, potentially compromising the lens's sharpness. Therefore, we strongly advise that this doublet be installed by professionals equipped with the necessary calibration tools. Please also consider that some OKC5-18-1 lenses inherently exhibit softness in their image quality, which may not be due to a cracked doublet. In such cases, replacing the doublet may not result in any improvement in sharpness. Included in this listing are screen grabs taken from a copy of OKC5-18-1 equipped with one of these replacement doublets. These images will give you a clear idea of the visual quality and performance you can expect. Regarding shipping, we dispatch our products via EMS. Typically, delivery takes between 7 to 14 days. However, in certain instances, it may take longer, which is beyond our control. We appreciate your understanding in this matter. By purchasing this product, you acknowledge the need for professional installation and the potential variability in improving lens sharpness. Please be advised that we are not affiliated with LOMO or any of its subsidiaries. Our replacement doublets for the OKC5-18-1 18mm are independently manufactured and not endorsed or produced in collaboration with LOMO.