At home, I have been able to test the 200 Pentacon after printing the appropriate thread adapter. Not a bad lens, but I have a certain feeling that the 180 Rodenstock that I am using normally. I think the old Pentacon has a bit more chromatic aberration around the edges. Since I only have an infinit...

A reflector telescope is a perfect parallel ray illumination system, placing the focus in the place where the eyepiece is normally placed

are analyzed, the cassiterite? I have sphalerite micros with the same color and shape.

Great control of lightning!

Here the photo with the phone

While I eagerly await the Pentacon, I have made an impromptu test. Since I don't have my collection of adapters here, I have placed a x4 on a stand and lowered the camera with the 100 macro until it almost touched the x4 adapter. In this way, the microscope objective and the camera objective are not...

wow, how many responses! This morning it was just a crazy idea jumping through my few brain cells. Now I'm looking on ebay for one of these targets. Although I will try to wait for the Leipzip Flohmarkt, if they don't confine us first.

My idea with this lens is to use it as a tube lens, but I want to try to put a pap motor that drives the focus ring and use that for the photo shifts for stacking. I have no idea if this can work, but it is cheap to test and if it works the set will be very rigid, as it does not need a displacement ...

Anyone here know how work as tube lens the Pentacon 200 f4 telephoto lenses? I have seen some in the markets of Leipzig, where I am working now

I bought a second-hand pentax because I had the intuition that a camera without low-pass filters would work much sharper when shooting with closed apertures. In this matter, I am delighted. But when I use the liveview on an external screen with HDMI with my Canon, the image brightens and darkens as ...

Someone are here using a Pentax body with liveview in his microscope? I buyed a second hand one, but I have some doubts...

Now that's a nice specimen! Almost looks like a Greek brochantite to me, but I could be wrong.

very near... Brochantite, but from Spain

I recently got a x10 from a member of this forum that is exact to the photo you post (well, the photo shows 0.30 and mine is 0.28) and, although I may not be very demanding about the results, I'm excited about the results. I'm thinking of changing the rest my lens now ... If what I know about astron...

those are very sharp images without halos, congratulations

maybe hematite?

but nice work, it is ancient?