For sale is such an aperture for filter holders with a diameter of 25mm. The ring diaphragm offers an inexpensive option for microscopy with oblique illumination up to a magnification of 40x. The aperture comes from the 3D printer and you can see that - but it works perfectly, is very stable and can no longer be seen in the filter holder anyway.

You are always invited to take a look at the offer in advance in 08525 Plauen. In order to exclude any doubts and misunderstandings, this is expressly desired! The purchase amount is to be paid in cash upon collection or in advance by Paypal or bank transfer. Subsequent negotiations are excluded, since every interested party had the opportunity to inspect the offer.