Search found 1215 matches

by Adalbert
Wed Mar 02, 2016 3:16 am
Forum: Equipment Discussions
Topic: Focus range of the CANON EF 70-200L 1:4 used as a tube lens
Replies: 2
Views: 658

Focus range of the CANON EF 70-200L 1:4 used as a tube lens

Hello everyone, Has anybody already found out the focus range of the CANON EF 70-200L 1:4 used as a tube lens (independent of vignetting)? I only would like to know the maximal thickness of the subject which can be taken by the usage of the focus of the Canon tele. Especially for the following micro...
by Adalbert
Wed Mar 02, 2016 2:52 am
Forum: Equipment Discussions
Topic: focus range of the CANON EF 70-200L 1:4 used as a tube lens
Replies: 0
Views: 209

focus range of the CANON EF 70-200L 1:4 used as a tube lens

Hello everyone, Has anybody already found out the focus range of the CANON EF 70-200L 1:4 used as a tube lens? I only would like to know the maximal thickness of the subject which can be taken by the usage of the focus of the Canon tele. Especially for the following microscope-lenses: 1.) NIKON CFI ...
by Adalbert
Wed Mar 02, 2016 2:48 am
Forum: Equipment Discussions
Topic: focus range of the CANON EF 70-200L 1:4 used as a tube lens
Replies: 0
Views: 247

focus range of the CANON EF 70-200L 1:4 used as a tube lens

Hello everyone, Has anybody already found out the focus range of the CANON EF 70-200L 1:4 used as a tube lens? I only would like to know the maximal thickness of the subject which can be taken by the usage of the focus of the Canon tele. Especially for the following microscope-lenses: 1.) NIKON CFI ...
by Adalbert
Mon Feb 29, 2016 9:30 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: How to calculate the step-size for the stacking
Replies: 12
Views: 2875

Hi Pau,
Thank you for the link!
My solution is similar but I’m using 58mm relay-lens (close to 63mm) for the full-frame.
Image
BR, Adi
by Adalbert
Mon Feb 29, 2016 8:13 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: How to calculate the step-size for the stacking
Replies: 12
Views: 2875

Hello Rene,
OK, but my calculation is based on the aperture (550nm/(NA*NA)) / 2

Image

At the moment I am taking two photos a level of DOF.
BR, Adi
by Adalbert
Fri Feb 26, 2016 1:22 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: How to calculate the step-size for the stacking
Replies: 12
Views: 2875

Hello pulsar123,
I am looking for the rule because I would like to implement it to my self-made macro-rail.
At the moment the NA is entered and the step –size is calculated by the program.
BR, Adi
by Adalbert
Fri Feb 26, 2016 1:12 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: How to calculate the step-size for the stacking
Replies: 12
Views: 2875

Hello Rik,
Can the DOF be affected by the manipulation of the iris of my relay-lens (Helios 44M) ?
Image
BR, Adi
by Adalbert
Fri Feb 26, 2016 5:29 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: How to calculate the step-size for the stacking
Replies: 12
Views: 2875

Hello Jörgen,
“I do not change the step size with different relay lenses.”
Are you using the same rule for the calculation of the step-size for the photos with an ocular and without any ocular?
BR, Adi
by Adalbert
Thu Feb 25, 2016 3:51 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: How to calculate the step-size for the stacking
Replies: 12
Views: 2875

How to calculate the step-size for the stacking

Hello everyone, Does anybody know any rule for the calculation of the size of the steps for the focus-stacking? Especially for the microphotography with an ocular and a relay-lens. BTW, for the macrophotography (without any ocular) I am using the rule based on NA 550nm/(NA*NA)) / 2 Thank you in adva...
by Adalbert
Sat Feb 20, 2016 6:43 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: CANON EOS 6D & RAYNOX DCR-250 & NIKON BE PLAN 10x
Replies: 9
Views: 2904

Hello Charles, 1.) Yes, I’m using a full-frame camera. 2.) Yes, I have tested with a CANON EF 100L macro too. Please take a look at the table with the results of my test: https://mikroskopie-forum.at/index.php/Thread/1657-endlich-unendlich/ 3.) Yes, vignetting is visible but it is much better with t...
by Adalbert
Sat Feb 20, 2016 6:31 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: CANON EOS 6D & RAYNOX DCR-250 & NIKON BE PLAN 10x
Replies: 9
Views: 2904

Hello Lou Jost, Ichthyophthirius, ChrisR, Rik,
Thank you for the hints and the links!
BR, Adi
by Adalbert
Sat Feb 20, 2016 6:28 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: CANON EOS 6D & RAYNOX DCR-250 & NIKON BE PLAN 10x
Replies: 9
Views: 2904

Hello Markus,
“The distance DCR-->objective depend on the needed vignetting free image circle on the sensor side”
Yes, I have already found some information about that. Probably I would have to assemble a variable construction between the sensor of the camera and the DCR.
BR, Adi
by Adalbert
Fri Feb 12, 2016 8:10 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: CANON EOS 6D & RAYNOX DCR-250 & NIKON BE PLAN 10x
Replies: 9
Views: 2904

CANON EOS 6D & RAYNOX DCR-250 & NIKON BE PLAN 10x

Hello everyone, This time I would like to use the DCR-250 as a tube lens (up to now I have used the CANON EF 70-200L and CANON EF 100L Macro). Does anybody know the optimal distances between the sensor and the DCR-250 and between the DCR-250 and the microscope-lens? I only have found something about...
by Adalbert
Sun Jan 24, 2016 4:27 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Set contrast threshold to?
Replies: 7
Views: 1422

Hello Rik,
Yes, I have scaled (150%) generally the font-size.
BR, Adi
by Adalbert
Sat Jan 23, 2016 1:47 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Set contrast threshold to?
Replies: 7
Views: 1422

Hello everybody, What should I change in the configuration (probably in Look and Feel) of the Zerene in order to get the „“OK“ button (something like scaling or size)? The “OK” button of the threshold in DMap is not visible ( and not reachable :-( I have this problem only on the UHD display (4K) . T...