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Gary Poole

Member Since 09 Dec 2006
Offline Last Active Today, 08:12 PM
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Posts I've Made

In Topic: Step Focus Experiment

27 November 2018 - 11:07 AM

There is a add on to Helicon Focus called Helicon Remote.  It's available for Windows, MAC, Android, and IOS.  Helicon Remote will step an AF lens through the exposures to make the stack, so that you can automate the process with cameras that don't have built in focus stacking like the D850.  I've used Helicon Remote with my D300, D800e, and D810.

 

Helicon Remote attaches to the camera with a USB cord.   You can control the camera and view the images with your remote device through the USB connection.  In auto stacking mode, you manually focus the lens at the min and max focus points and the program will step the lens though the range of the stack.  You can select the interval between shots.  When the sequence is done, Helicon Remote on a PC or MAC will automatically start Helicon Focus to process the images.  You can also use Helicon Remote in a manual mode with you adjusting focus or moving the camera using a focusing rail for each step.

 

Why US coins instead of Canadian ones?


In Topic: Durango & Silverton Train

08 October 2018 - 05:19 PM

Like your shots, especially #1.

 

Glad to see you found my suggested location along the highway for #2.   Judging by the time stamps #1 must have been taken very near SIlverton.  I looked for a location like that but wasn't successful.


In Topic: Fun with older lenses on D850

04 September 2018 - 08:40 PM

I like your dog, Gary.

 

I will bet he is the most well behaved, well trained, dog you have ever had! :lol:

 

Very nice.

The food cost and vet bills are low too.  :) 


In Topic: Fun with older lenses on D850

04 September 2018 - 02:05 PM

I finally took the time to play with a couple of my MF lenses on my D810.  This is my dog.  I expect it is a bit more patient than Eric's.  That patience allowed me to shoot from a tripod using mirror up and electronic front curtain, so camera motion as well as subject motion should be nil.

  • The first of each pair of pictures was with a Nikkor-P 105mm f:2.5, SN 432xx.  This is a pre AI lens from 1971-1973 with a factory AI conversion kit.  The optical formula is 5 elements in 4 groups.  The first version of this lens was a 5/3 formula.  This appears to be the last version of the 105/2.5 prior to multi-coating.
  • The second of each pair of lenses was with a Nikkor-H 85mm f:1.8 SN 222xxx.  This is a pre AI lens from 1969-1971 that was converted to AI by Jon White of aiconversions.com .  Based on the date Eric posted this lens is one generation newer than his, but the specs are the same and I can't see any differences in the pictures of the lens.

These images were made with both lenses wide open.  I did minimal processing in Lightroom, sharpening with my normal D800e/D810 settings and used Remove Chromatic Aberration.  I adjusted the 85mm exposure slightly to match the 105mm exposure.

 

I am amazed at the smooth bokeh that I see from both lenses. 

 

 

These first 2 images are the complete frame from the 105mm and then the 85mm

Attached File  GTP_20180904_006.jpg   279.67KB   0 downloads  Attached File  GTP_20180904_007.jpg   268.9KB   0 downloads

 

These are 1:1 crops from the 105mm followed by the 85mm.  To me the 105 is a bit sharper, at least a maximum aperature.  Because the 105 is almost 1 stop slower, maybe the comparison isn't fair.  I should have also made f:2.5 exposures with the 85mm, but didn't think of it at the time.

Attached File  GTP_20180904_006-2.jpg   244.92KB   0 downloads  Attached File  GTP_20180904_007-2.jpg   239.1KB   0 downloads


In Topic: Fun with older lenses on D850

24 August 2018 - 01:54 PM

 

,,,

 

One of the interesting things about the Z6 and Z7 is they will bring VR to these old manual focus lenses though in-body stabilization. 

 

...

According to Thom Hogan there is no AI coupling mechanism on the FTZ.  This means that if MF lenses work with the adapter, we will have stop down metering instead of full aperture metering.  Or even worse, no effective metering if the FTZ leaves the aperture wide open until the time of exposure.  If a MF lens does stop down for exposure we may also be focusing at the picture taking aperture instead of wide open unless we do a lot of moving the aperture ring back and forth.