Search found 47 matches

by chuong nguyen
Tue Jul 18, 2017 10:23 pm
Forum: Equipment Discussions
Topic: Coastal Optical lenses vs Scanner 8000ED lens at 1X
Replies: 12
Views: 1782

ray_parkhurst wrote:The Nikon has better contrast in both center and corner, but the Coastal is sharper in the corner.
I agree. BTW, top is Coastal. I wonder what is the logic behind infinity design of the Coastal system vs single lens ?
Chuong
by chuong nguyen
Tue Jul 18, 2017 7:55 pm
Forum: Equipment Discussions
Topic: Coastal Optical lenses vs Scanner 8000ED lens at 1X
Replies: 12
Views: 1782

Coastal Optical lenses vs Scanner 8000ED lens at 1X

I got these four massive lenses custom made by Coastal Optical System some time ago from a surplus vendor but never had time to test them. The black lenses on the left are actually infinity objectives. They can be coupled for mag between 1X to 2X. The tall one from the picture is two 105 f2.38 coupl...
by chuong nguyen
Sat Jun 24, 2017 7:16 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Butterfly Wing
Replies: 11
Views: 1551

Nice. Thanks for sharing.

Chuong
by chuong nguyen
Wed Jun 21, 2017 5:33 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Butterfly with Inspec.X 105 f/4 at 2X, 35 stitch
Replies: 3
Views: 953

ChrisR wrote:That's very good. How long did it take?
It took me about 6 hours total. Three hours to setup and take pictures,
by chuong nguyen
Tue Jun 20, 2017 7:07 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Butterfly with Inspec.X 105 f/4 at 2X, 35 stitch
Replies: 3
Views: 953

Butterfly with Inspec.X 105 f/4 at 2X, 35 stitch

I just like to share the composite image of 35 stacked image taken with this lens at 2X.
http://www.gigapan.com/gigapans/197620
by chuong nguyen
Wed Apr 05, 2017 4:25 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Nikon Ultra Micro 28 vs Zeiss S Planar 25 at 10X
Replies: 1
Views: 865

Nikon Ultra Micro 28 vs Zeiss S Planar 25 at 10X

I just like to share some images taken with these two special lenses mounting reverse on the Olympus OMD M5. No post processing after stacked on rail with same setup and LED lighting. Nikon Ultra Micro Nikor 28 mm f 1.8 e-line green Zeiss S-planar 25 mm f 1.6 5460 angstrom They are both design to re...
by chuong nguyen
Mon Mar 20, 2017 8:40 pm
Forum: Equipment Exchange
Topic: Wanted: Schneider Kreuznach Unifoc-58 *FOUND*
Replies: 3
Views: 1005

Hi, I have one if you still interested.
Chuong
by chuong nguyen
Sun Mar 05, 2017 9:27 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Silverfish
Replies: 12
Views: 1191

Thanks for sharing. To do it right = hard work.
by chuong nguyen
Thu Mar 02, 2017 9:41 pm
Forum: Equipment Discussions
Topic: Rodenstock MTF Graphs Too Good to be True?
Replies: 3
Views: 2650

by chuong nguyen
Fri May 06, 2016 10:36 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: In-camera focus bracketing with Olympus OMD M1 part 2
Replies: 97
Views: 49095

I just want to share that the Olympus 40-150 2.8 could be used as tube lens with inf corrected lens/objective for stacking. The image was taken with Olym Zoom at 150 FL + Nik CFI 4X .13 NA, 500stack. http://www.photomacrography.net/forum/userpix/1872_Flyhead_OZoomNik4X_2_500stack_1.jpg Great image!...
by chuong nguyen
Sat Apr 23, 2016 12:19 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: In-camera focus bracketing with Olympus OMD M1 part 2
Replies: 97
Views: 49095

Sorry for the bad formatting. Copy from Excel and past did not work to well.
by chuong nguyen
Sat Apr 23, 2016 12:14 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: In-camera focus bracketing with Olympus OMD M1 part 2
Replies: 97
Views: 49095

Below is the number of bracketing shots with various lenses and settings. Olympus allows two parameters, #of shots and "focus differential" (step size). For this test, the # of shot was set at 999 and FD from 1 to 10. The number of shots from minimum distance to infinity was recorded. Lens Fl f # 1 ...
by chuong nguyen
Sat Apr 23, 2016 12:41 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: In-camera focus bracketing with Olympus OMD M1 part 2
Replies: 97
Views: 49095

Here is the test target ( 1mm microscope calibration ) with 20X Nikon CFI in front of the Olympus 40-150 2.8 set at 150. The target was slanted so that the focus varies from 10 meter to infinity. Lighting was stronger on the left side. Helicon image: http://www.photomacrography.net/forum/userpix/187...
by chuong nguyen
Fri Apr 22, 2016 8:20 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: In-camera focus bracketing with Olympus OMD M1 part 2
Replies: 97
Views: 49095

I have tried in camera stacking with objectives and lenses up to 10X with very good results. With 20X objective, the allowable stack depth is only about 300 microns when focus changes from 5 meter to infinity. The FOV changes about 10 percent.
by chuong nguyen
Thu Apr 21, 2016 8:43 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: In-camera focus bracketing with Olympus OMD M1 part 2
Replies: 97
Views: 49095

Yes, it was in-camera bracketing. Very fast and minimum vibration.