Search found 175 matches

by JKT
Wed Oct 28, 2020 10:47 pm
Forum: Equipment Discussions
Topic: MJKZZ Extreme system and ...
Replies: 33
Views: 575

Re: MJKZZ Extreme system and ...

What tube lens?
by JKT
Tue Oct 27, 2020 10:57 pm
Forum: Equipment Discussions
Topic: Please help me identify this Olympus OEM 60x objective
Replies: 8
Views: 207

Re: Please help me identify this Olympus OEM 60x objective

The surface of the inner shell looks rather neat. Have you tried to remove the tinfoil to see whether there's writing under it?
by JKT
Sun Oct 25, 2020 10:59 am
Forum: Equipment Discussions
Topic: Thorlabs SM2 tubes flocking? (+ other question)
Replies: 3
Views: 126

Re: Thorlabs SM2 tubes flocking? (+ other question)

As far as damaging the lens goes, it is relatively difficult to damage round metal tube with distributed compression. Sharp ridges are to be avoided, though. The diameter of the clamp is also important. If it is off, you could indeed damage the lens. It is also possible to dimension the clamp so tha...
by JKT
Sun Oct 25, 2020 4:38 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Laser aiming and focus in photomacrography
Replies: 44
Views: 41758

Re: Laser aiming and focus in photomacrography

Oddly, it seems eminently practical to me. Well, it is independent of used objective and practical in that way. On the other hand in vertical system like mine the removed camera body is a problem ... especially if I don't want to unplug shutter, USB and power cables. Horizontal system should be eas...
by JKT
Sun Oct 25, 2020 1:21 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Laser aiming and focus in photomacrography
Replies: 44
Views: 41758

Re: Laser aiming and focus in photomacrography

Pau wrote:
Sun Oct 25, 2020 1:09 am
Of course this doesn't seem very practical.
Can't argue with that. :)
by JKT
Sun Oct 25, 2020 12:43 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Laser aiming and focus in photomacrography
Replies: 44
Views: 41758

Re: Laser aiming and focus in photomacrography

How could this be made to work with mirrorless? If the lens was directly supported (as opposed to being supported via camera) then it should be possible to create a system that attaches to the lens bayonet. So you'd first use the laser at the top (vertical) of the lens and when that seems OK you'd s...
by JKT
Sun Oct 18, 2020 1:22 pm
Forum: Equipment Discussions
Topic: Packing expensive objective lenses for shipping.
Replies: 15
Views: 1652

Re: Packing expensive objective lenses for shipping.

Oh my! The packaging doesn't sound bad at all, at least how you described it. That's one nasty crack, was it thrown out of a plane? I hope you got a hefty chunk of a partial refund. If I was the seller, it would have been a full refund. The Raynox in question comes with 2 parts, right? If the other...
by JKT
Sat Oct 17, 2020 2:03 pm
Forum: Equipment Discussions
Topic: Packing expensive objective lenses for shipping.
Replies: 15
Views: 1652

Re: Packing expensive objective lenses for shipping.

Rather small cardboard box, single layer of bubble wrap around the item and a couple of large air bags to take up most of the empty space. The item was free to move among the bubbles and the corner just happened to be against the side that took a hit. Nothing on the outside of the box, a small dent ...
by JKT
Sun Oct 11, 2020 9:17 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Effective aperture with teleconverter + macro lens
Replies: 6
Views: 318

Re: Effective aperture with teleconverter + macro lens

I suspect that the difference (if there is one - that I didn't check) comes from the different working distance.
by JKT
Thu Oct 08, 2020 10:46 am
Forum: Equipment Exchange
Topic: Heads-up: M52x0.75 extension tubes
Replies: 4
Views: 469

Re: Heads-up: M52x0.75 extension tubes

Then again - maybe not. I have seen similar quality thread before ... but that has been in titanium and machined by an amateur. :lol: The tubes DO thread together, but getting them aligned to begin is not exactly easy. The parts that were supposed to connect to camera and lens were beyond descriptio...
by JKT
Sat Oct 03, 2020 2:13 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Tube lens setup without adjustment
Replies: 5
Views: 377

Re: Tube lens setup without adjustment

That's FD, isn't it? Couple of decades of development might help against the CA. Then again - it might not. :) More important is the f/2.8. I was thinking about f/4.0, which would keep the price reasonable. Unfortunately the vignetting behaviour is unknown. Edit: Apparently there is also EF Fluorite...
by JKT
Sat Oct 03, 2020 1:29 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Tube lens setup without adjustment
Replies: 5
Views: 377

Re: Tube lens setup without adjustment

So far I have used them with objectives. With the coming two additions I may finally have the longer end covered sufficiently. That leaves magnifications 3.5 ... 7.5 as problematic area. MP-E works for 3.5 ... 5 and it is definitely enough for me under 3x, but a bit more resolution near 5x wouldn't ...
by JKT
Sat Oct 03, 2020 8:11 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Tube lens setup without adjustment
Replies: 5
Views: 377

Tube lens setup without adjustment

I suppose there are two main philosophies to set up your tube lenses. The first minimizes the number of required parts and the second the adjustments when changing lenses. I prefer the latter. The tube lenses are nothing special, but they work for me. The first part of the setup uses Thorlabs 3" SM2...
by JKT
Fri Oct 02, 2020 6:25 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Strange colors...and I don't know what to change.
Replies: 4
Views: 426

Re: Strange colors...and I don't know what to change.

I suspect that ZS is not doing anything to the colors. It just doesn't know how to modify the colors to match the monitor profile. Or the colors could be wrong and ZS shows them correctly, but a program that doesn't handle profiles well shows them wrong in such a way that the colors look good. In an...
by JKT
Wed Sep 30, 2020 12:37 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: vertical vs. horizontal setup
Replies: 6
Views: 605

Re: vertical vs. horizontal setup

I haven't had problems damaging samples at the setup. Once I put them on the "stage", I can just slide them under my light setup. It is designed so that there is enough space under it. Operating one in micropins is dangerous for the sample, but the setup direction has no bearing on that. I have to a...