Search found 1300 matches

by JH
Sat Mar 27, 2021 11:43 am
Forum: Equipment Discussions
Topic: The new bargain: PL M 100 / 0.90 ∞
Replies: 26
Views: 2467

Re: The new bargain: PL M 100 / 0.90 ∞

Hi Adalbert
Interesting lens and topic, thank you.
I think it is quite possible to do ok with a 100x NA 0.9.
I have also seen yellow (and orange scales) look that the ones you have in the first picture but with lower NA.
May I ask how you light the subject?

Best regards
Jörgen
by JH
Sun Feb 28, 2021 10:54 am
Forum: Photography Through the Microscope
Topic: Nikon plan apo 20x 0.75
Replies: 21
Views: 3505

Re: Nikon plan apo 20x 0.75

Really nice experiment, just one thing. Increasing the distance between the tube lens and sensor also changes magnification, right? I am used to work with raynox on a bellows and it does that, change magnification as you increase/decrease the bellows extension. So, with that 300mm tube lens plus 80...
by JH
Wed Feb 24, 2021 3:46 pm
Forum: Photography Through the Microscope
Topic: Nikon plan apo 20x 0.75
Replies: 21
Views: 3505

Re: Nikon plan apo 20x 0.75

Nikon plan apo 20/ 0.75 Nikon 300 mm tube lens and 8 cm extra distance between tube lens and sensor (compensating variation). Diffused led. The short WD distance made lighting troublesome, - I had to adjust the colours a little more than usual in Adobe PS (saturation and more contrast in the blue ch...
by JH
Tue Feb 23, 2021 1:59 pm
Forum: Photography Through the Microscope
Topic: Nikon plan apo 20x 0.75
Replies: 21
Views: 3505

Re: Nikon plan apo 20x 0.75

Thanks both Jörgen and Rik. Increasing the tube lens to sensor distance (actually focusing it closer than infinite), how it does affect the free working distance? I assume that it will be shorter than the nominal 1mm, am I right? Jörgen, any chance to view your tests at full resolution? Pau That is...
by JH
Sat Feb 20, 2021 5:04 pm
Forum: Photography Through the Microscope
Topic: Nikon plan apo 20x 0.75
Replies: 21
Views: 3505

Re: Nikon plan apo 20x 0.75

Hi Pau
No formula - more trial and error with combinations of tubes with fixed lengths, My best guess from the distances I did test is that optimum might be a little shorter.
/Jörgen
by JH
Sat Feb 20, 2021 4:07 pm
Forum: Photography Through the Microscope
Topic: Nikon plan apo 20x 0.75
Replies: 21
Views: 3505

Re: Nikon plan apo 20x 0.75

Thanks RB To follow up on compenasting variation with the Nikon plan apo 20x / 0.75 I did a series of pictures showing the difference between 1) a coverslip attached to the objective, 2) no coverslip and 3) no coverslip but 86 mm extra distance between sensor and tube lens - compensating variation: ...
by JH
Thu Sep 17, 2020 12:50 pm
Forum: Photography Through the Microscope
Topic: Tic
Replies: 6
Views: 1965

Re: Tic

Thanks for the nice comments! I pulled the stereo image into StereoPhoto Maker and blew it up so I could see all the details. The translucency showing structures on multiple levels comes through wonderfully. --Rik Yes - For translucent subjects like this it is realy worth the effort making stereo pi...
by JH
Thu Aug 27, 2020 1:38 pm
Forum: Photography Through the Microscope
Topic: Tic
Replies: 6
Views: 1965

Tic

The genital aperture of a tick under UV light. I used a Nikon 20x fluor microscope objective.
TIC.jpg
Stereo.jpg
by JH
Mon May 25, 2020 12:55 pm
Forum: Nature Photography -- Macro and Close-up
Topic: Macros to share
Replies: 14
Views: 3286

Nice, thanks for posting.

Best regards
Jörgen Hellberg
by JH
Sat May 02, 2020 7:19 am
Forum: Photography Through the Microscope
Topic: Freshwater mites
Replies: 14
Views: 2285

Nice!
Best regards
Jörgen Hellberg
by JH
Sun Apr 19, 2020 12:15 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: SONY AWARD
Replies: 17
Views: 6194

Congratulations!

Best regards
Jörgen Hellberg
by JH
Mon Apr 13, 2020 12:33 pm
Forum: Nature Photography -- Macro and Close-up
Topic: Early spring flowers
Replies: 0
Views: 2533

Early spring flowers

I was actually out looking for snakes using my 400mm and one extension tube to get some extra distance not to disturb the animals. The 400mm pictures are not macro so I do not post them here. On my way back I used my 100mm macro. The first picture is a Wood anemone (Anemone nemorosa). The second is ...
by JH
Mon Apr 13, 2020 12:19 pm
Forum: Administrator's Appreciation Gallery...Macro and Close-up Images
Topic: Spiked
Replies: 18
Views: 10346

Original and very nice!
Best regards
Jörgen Hellberg
by JH
Sun Mar 29, 2020 10:04 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Scales
Replies: 3
Views: 1682

Really nice!
Best regards
Jörgen Hellberg
by JH
Sun Mar 15, 2020 3:04 pm
Forum: Photography Through the Microscope
Topic: Amino Acids
Replies: 3
Views: 809

Nice!
Best regards
Jörgen Hellberg