3/10/2024 0 Comments 4k beamer kurzdistanz![]() Unser Test von drei 4K -Laserprojektoren zeigt: Das Heimkino war selten so einfach aufzuwerten. ![]() I could conclude that every 0.18mm groove pitched ones from taobao are identical and not good. Ultra-Kurzdistanz-Beamer im Test: Wir missachten die Abstandsregel. I suspect the lens mold itself has some defects. I also test 0.18mm groove pitch from several different sellers, and 0.3mm pitch from three different sellers.What I found out is that, every 0.18mm groove pitched fresnel lenses have the same defect at the same positions. Place materials, check the image quality, record.If new stuffs came, I did the same procedure to find out the best.I used a linear motion guide to place the positions of the LCD and the fresnel lens easily.During test, I've found out some useful(?) infos as follows: Notes on fresnel lens qualityNormally, fine grooves on fresnel lens will give you sharper image quality.The finest groove pitch I could get was 0.1mm. ![]() Hope I could feel it in near future.Now, you can decide whether to make this or not!Let me start! You can skip this step and the next step as I give you the final version of drawings and materials.I just want to share how I found out the final material combinations.This step was so painful as I did so many tests with so many lenses.As the optics is not perfect, the only way to find out best material combination and proper distances between materials is try & error.This step took me several weeks. BTW, many people say HDR is another new sensation.
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