Search found 599 matches

by Troels
Tue Feb 07, 2023 5:55 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: motor winding
Replies: 1
Views: 921

Re: motor winding

Perfect design for electric airplanes!
by Troels
Sun Dec 11, 2022 2:45 pm
Forum: Equipment Exchange
Topic: Sold: heavy duty sliding stage - Rose & Krieger 120mm
Replies: 3
Views: 1209

Re: heavy duty sliding stage - Rose & Krieger 120mm

No problems with pictures in Firefox.

Very nice stage!
Troels
by Troels
Mon Oct 24, 2022 1:48 pm
Forum: Equipment Discussions
Topic: Pentax Eyepieces
Replies: 4
Views: 779

Re: Pentax Eyepieces

The apparent angle of view of this 14 mm Pentax eyepiece is 70 degrees. Not exactly the almost 180 (?) degrees of an Imax theater.
But enough to create a feeling of looking at more than you can grasp with a sigle view.
by Troels
Mon Oct 24, 2022 2:40 am
Forum: Equipment Discussions
Topic: Pentax Eyepieces
Replies: 4
Views: 779

Re: Pentax Eyepieces

I have for years used the PENTAX eyepiece XW14 with my mini spotting scope for wide field bird wathing at around 30x mag. It is a state of the art eyepiece with huge field and impressive sharpness and color correction. A pleasure to use. These Pentax eyepieces also have a high reputation among amate...
by Troels
Thu Oct 13, 2022 1:49 am
Forum: Equipment Exchange
Topic: Macro stage XYW Edmund optics
Replies: 1
Views: 1232

Re: Macro stage XYW Edmund optics + Micro stage XYR Melles Griot

Interested in the micro stage.
Sent you a PM.
Troels
by Troels
Sun Aug 14, 2022 11:32 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Just An Observation
Replies: 6
Views: 1157

Re: Just An Observation

Fungi are living organisms creating energy by decomposing organic matter. In this proces they use oxygen and excrete CO2 - and H2O! The decomposing of a bee might produce more water than present in the dead bee. Some fungi utilize this proces to grow in almost dry wood, like timber in buildings. The...
by Troels
Sun May 22, 2022 1:58 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: 3D stack of a tiny white jumping spider
Replies: 4
Views: 1043

Re: 3D stack of a tiny white jumping spider

Mindblowing, beautiful!
Thanks for the huge amout of work behind this little movie.
Almost 550 stacks!
by Troels
Mon Apr 18, 2022 5:53 am
Forum: Equipment Discussions
Topic: What about that fresnel lens on your camera flash?
Replies: 8
Views: 1559

Re: What about that fresnel lens on your camera flash?

To be a true fresnel lens the single grooves must have the shape of cirkular part of a lens surface. This is apparently not the case here. Parts of the groves are just straight lines. I doubt this surface wil be able to focus anything at all. The center square has a completely different structure. I...
by Troels
Thu Feb 24, 2022 8:03 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: 3 microscope objectives, ? quality
Replies: 11
Views: 2118

Re: 3 microscope objectives, ? quality

Ben, I also noted an error, either a misunderstanding or a typo: "All infinity corrected." That is obviously not the case. On 'infinity' objectives the inscription is a "sleeping" 8 instead of the number 160. So all your objectivers are finite. With infinite objectives you don't need correcting ocul...
by Troels
Sat Feb 12, 2022 3:41 pm
Forum: General Discussion Forum and Community Announcements
Topic: Amazing James Webb Space Telescope
Replies: 37
Views: 8294

Re: Amazing James Webb Space Telescope

Fascinating technology. I read somewhere, that they actually had to heat the electronics during the first part of the travel to prevent humidity condensation. After released in empty space the unfolded sunshields will protect the equipment from further temperature shifts and the final cool down can ...
by Troels
Fri Feb 11, 2022 2:10 am
Forum: General Discussion Forum and Community Announcements
Topic: Finally, a convincing use of the Laowa 24mm 2X Macro Probe
Replies: 4
Views: 1745

Re: Finally, a convincing use of the Laowa 24mm 2X Macro Probe

Thanks for sharing this, Chris.

Very creative and artistic use of a macro lens.
I saved the link and consider bying one of the prints.
An original gift for a musician (or myself?).

Troels
by Troels
Sun Feb 06, 2022 5:20 am
Forum: Nature Photography -- Macro and Close-up
Topic: Comatricha Slime Mold
Replies: 14
Views: 1707

Re: Comatricha Slime Mold

Very nice and interesting pictures.
Troels
by Troels
Tue Jan 11, 2022 10:04 am
Forum: Nature Photography -- Macro and Close-up
Topic: Asking for help with ID of creatures from Sri Lanka
Replies: 6
Views: 1189

Re: Asking for help with ID of creatures from Sri Lanka

Thanks Doppler! I have just added links to the full size pictures on Flickr, where the EXIF-information is provided with details of equipment and exposure. I am a fan of using tele lenses for close-up in the field. As you can see in my added descriptions, two of the pictures are actually focus stack...
by Troels
Mon Jan 10, 2022 3:12 pm
Forum: Nature Photography -- Macro and Close-up
Topic: Asking for help with ID of creatures from Sri Lanka
Replies: 6
Views: 1189

Re: Asking for help with ID of creatures from Sri Lanka

Thanks Bob and Scarodactyl! Both of your proposals have been useful in further research. It looks as if the spider really is Nephila pilipes although the term Giant Golden Orbweaver is used for several different species. The milliped is more difficult. The term Sri Lankan Giant Milliped is used for ...
by Troels
Sat Jan 08, 2022 10:33 am
Forum: Nature Photography -- Macro and Close-up
Topic: Asking for help with ID of creatures from Sri Lanka
Replies: 6
Views: 1189

Asking for help with ID of creatures from Sri Lanka

Just returned from a nature travel around the southern Sri Lanka. Wonderfull country with a marvelous amount of birds, reptiles and mammals. I also caught a few close-ups of invertebrates. Without access to handbooks they are difficult to identify. If somebody could help me with some names, perhaps ...