Search found 88 matches

by billjanes1
Tue Feb 13, 2018 12:28 pm
Forum: Equipment Discussions
Topic: Longitudinal Chromatic Aberration 1X Macro Lens Test
Replies: 42
Views: 7355

Robert did indicate that LoCA can be removed by stacking with Zerene (and presumably with other stacking algorithms), which is interesting and previously unknown to me. Since stacking is often used with higher magnification, LoCA is less problematic in this situation. One limitation of his test ser...
by billjanes1
Tue Feb 13, 2018 8:21 am
Forum: Equipment Discussions
Topic: Longitudinal Chromatic Aberration 1X Macro Lens Test
Replies: 42
Views: 7355

Doppelganger, you've stated several times that CA can be corrected in post, while lack of sharpness cannot. However, the type of CA that Robert's tests were designed to reveal, LoCA, is not readily correctable in post. That's why Robert's tests here, which are aimed just at that aspect of the image...
by billjanes1
Wed Feb 07, 2018 10:35 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: MTF mapper
Replies: 30
Views: 17059

I'm actually pretty happy with the results that ADi is getting with his razor blade. Perhaps the razor blades that I have looked at in the past were just badly made. I'll get another sample next time I go to the grocery store. --Rik Rik, You might consider looking at these German razor blades that ...
by billjanes1
Sun Feb 04, 2018 11:22 am
Forum: Macro & Microscopy Articles
Topic: Nikon D850 Focus Stacking Step Size
Replies: 6
Views: 9768

Shooting 2-3' from the sensor using the 105 macro at f5.6. I didn't test anything at a magnification lower than 1:4 which put the subject 17.5" from the front of the lens. The values from my data table in an earlier post suggest the step values move from lower values to higher values as you increas...
by billjanes1
Mon Jan 22, 2018 5:31 am
Forum: Equipment Discussions
Topic: EFCS & Flash in LV Circuit
Replies: 29
Views: 7161

Chris, Here's the preliminary schematic from my notebook, haven't built nor tested anything yet. Just noticed that the 100 ohm resistor left wire should extend to the center contact of the circular symbol for the Optional Optically Isolated Input connection/connector. Mike Mike, Count me in too. I ...
by billjanes1
Tue Jan 16, 2018 11:03 am
Forum: Equipment Discussions
Topic: Where to Get Optical Breadboards?
Replies: 31
Views: 5396

Bill, Looks like you've got a Mitutoyo 5X in front of an old Nikon 200mm F4? Best, Mike, Thanks for your help and comments. You are correct. That is a Mitutoyo 5x in front of an old Nikon 200 mm f/4 Ai. I also have the Mitutoyo10x. The Nikon tube lens seems to be working well, but I have no basis f...
by billjanes1
Tue Jan 16, 2018 8:56 am
Forum: Equipment Discussions
Topic: Where to Get Optical Breadboards?
Replies: 31
Views: 5396

My recent setup

I have the following for my main setup base: MB1236 1/2" thick Aluminum 12" by 36" base (1/4-20 taps) This might be back ordered, so I would get the 48" long version MB1248 if so. XT95SP-1000 95mm One -Side Slide Rail 1000mm XT95P11 95mm Drop On Rail Carrage (1/4-20 taps) XT95P12 95mm Rail Plate (1...
by billjanes1
Mon Jan 01, 2018 4:01 pm
Forum: Equipment Discussions
Topic: Nikon EFCS & Flash
Replies: 19
Views: 3553

While watching the Rose Bowl Parade I realized that the same technique for capturing a water drop image can be used to enable flash with the EFCS in Live View by delaying the flash command after the exposure has started. Peter at MJKZZ has a water drop controller that should work by delaying the fl...
by billjanes1
Sat Dec 30, 2017 5:59 pm
Forum: Equipment Discussions
Topic: Nikon EFCS & Flash
Replies: 19
Views: 3553

Re: Nikon EFCS & Flash

Think I've solved the problem with using the EFCS and flash on the Nikon D850 (should work on the D500 as well). This is very preliminary, but wanted to get this out to the folks that are struggling getting EFCS and flash to play together. Mike, A very informative post, but I find that my D850 work...
by billjanes1
Wed Dec 27, 2017 4:01 pm
Forum: Equipment Discussions
Topic: Where to Get Optical Breadboards?
Replies: 31
Views: 5396

I have the following for my main setup base: MB1236 1/2" thick Aluminum 12" by 36" base (1/4-20 taps) This might be back ordered, so I would get the 48" long version MB1248 if so. XT95SP-1000 95mm One -Side Slide Rail 1000mm XT95P11 95mm Drop On Rail Carrage (1/4-20 taps) XT95P12 95mm Rail Plate (1...
by billjanes1
Wed Dec 27, 2017 12:00 pm
Forum: Equipment Discussions
Topic: Where to Get Optical Breadboards?
Replies: 31
Views: 5396

I have the following for my main setup base: MB1236 1/2" thick Aluminum 12" by 36" base (1/4-20 taps) This might be back ordered, so I would get the 48" long version MB1248 if so. XT95SP-1000 95mm One -Side Slide Rail 1000mm XT95P11 95mm Drop On Rail Carrage (1/4-20 taps) XT95P12 95mm Rail Plate (1...
by billjanes1
Sat Oct 28, 2017 9:19 am
Forum: Macro & Microscopy Articles
Topic: Nikon D850 Focus Stacking Step Size
Replies: 6
Views: 9768

Nikon D850 Focus Stacking Step Size

The Nikon D850 focus stacking facility is interesting and potentially very useful,but there is not much information on how to use it. What step size and how many images should be taken for a given magnification. I performed a simple experiment using the 105 f/2.8 AFS at f/8. The results are not well...
by billjanes1
Sun Sep 24, 2017 12:27 pm
Forum: Equipment Discussions
Topic: Longitudinal Chromatic Aberration 1X Macro Lens Test
Replies: 42
Views: 7355

Re: Longitudinal Chromatic Aberration 1X Macro Lens Test

LoCA 1X Test Any questions or comments just reply to the thread. BTW anyone with any good ideas for a nice and easy Bokeh test, let me know! Robert RobertOToole.com Closeuphotography.com Robert, Thank you very much for this excellent and exhaustive set of tests.The main criterion for LoCA was out o...
by billjanes1
Sun Sep 17, 2017 7:13 am
Forum: Equipment Discussions
Topic: All-electronic shutters
Replies: 34
Views: 4472

Since that occurs after the exposure, it has no effect on that photo, so most people don't care about it. I do because of my moveable subjects; the vibrations don't affect the present picture but do affect the next one. Not entirely after the exposure. According to Jim Kasson it takes about 2.5 ms ...
by billjanes1
Sat Sep 16, 2017 7:18 am
Forum: Equipment Discussions
Topic: Nikon D850 focus step size at 1:1 magnification
Replies: 20
Views: 7414

On page 217 they discuss the focus shift (stacking) feature. It can not be used with live view Well, that's $3500 I don't need to spend then. I had no interest in this feature anyway, so no harm no foul in my case. All I care about is: FF EFCS (or better yet full electronic shutter) No AA filter De...