Product comes as shown. It has a standard thread and fits my Celestron microscope perfectly. I'm new to working with microscopes and it seems that objective lenses are usually the same length to make it easier to focus when going to a higher magnification. This lens is much longer than the standard lenses on a Celestron microscope, so you'll need to practice focusing without getting too close to the correct focal length. I didn't have lentil oil on hand either, so I used olive oil instead. However, once I got the focus right I was really impressed with the image quality and relieved that this "expensive" lens matched my Celestron! I expect to be more impressed once I use the right oil. I was able to take a good photo of human sperm (slide prepared by AmScope) which is approximately 2.5 Β΅m in diameter. There was no visible distortion in the field of view. I recommend this product, it's quite heavy and good quality.
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