Search found 4579 matches

by Lou Jost
Sun Sep 06, 2020 4:21 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Monochrome Camera / Techniques?
Replies: 47
Views: 2828

Re: Monochrome Camera / Techniques?

Steve, most cameras do not export four shifted RAWs, so that was why I didn't think that is what you meant. I think Sony may be the only one; you mentioned Pentax but the K-1 (which I have) does the combining in-camera, like Olympus and Panasonic and all others that I can think of. None of these all...
by Lou Jost
Sun Sep 06, 2020 1:05 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Monochrome Camera / Techniques?
Replies: 47
Views: 2828

Re: Monochrome Camera / Techniques?

Have you compared the colour channels and seen that (after scaling or curving) they would cause incomparable lightness differences? I don't think I understand the question. Since the red will appear very dark, and blue areas will be bright, the result will look nothing like a true monochrome image,...
by Lou Jost
Sun Sep 06, 2020 12:58 pm
Forum: Equipment Discussions
Topic: Moisture in my Raynox lens. Suggestions?
Replies: 18
Views: 1739

Re: Moisture in my Raynox lens. Suggestions?

Those dessicant pouches are jokes, they saturate almost immediately unless the package is airtight (that's why dessicant with indicator dyes are so useful--you can tell when the dessicant is useless). You will have to heat them gently for along time (if they are silica) before you can use them again.
by Lou Jost
Sun Sep 06, 2020 11:49 am
Forum: Equipment Discussions
Topic: Moisture in my Raynox lens. Suggestions?
Replies: 18
Views: 1739

Re: Moisture in my Raynox lens. Suggestions?

The standard trick that tropical biologists use is to put it in a bag with very dry rice, and seal it.
by Lou Jost
Sun Sep 06, 2020 11:42 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Monochrome Camera / Techniques?
Replies: 47
Views: 2828

Re: Monochrome Camera / Techniques?

I've done this with lasers, and there is crossover betrween colors, but this doesn't save you from the problem that a bright red object will appear dark under monochromatic blue light. In real monochrome photography, that area would be light (in the absence of the filters that B&W photographers are ...
by Lou Jost
Sun Sep 06, 2020 10:31 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Monochrome Camera / Techniques?
Replies: 47
Views: 2828

Re: Monochrome Camera / Techniques?

Steve, I am not sure what you are doing. Are you just shifting a single whole image by one pixel in each direction? In a real 4-image pixel-shift, the sensor is shifted so that each pixel gets a genuine measurement of each color (twice for green) of a pixel-sized point on the subject. The combining ...
by Lou Jost
Sun Sep 06, 2020 10:09 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Monochrome Camera / Techniques?
Replies: 47
Views: 2828

Re: Monochrome Camera / Techniques?

Wouldn't a band-pass filter in front of the lens do this trick? No, not if you want to photograph luminance. With a narrow-band filter or monochromatic light, the only things that will be bright in the image are things of that color. "someone asked me whether it wouldn't be easier to move to one of...
by Lou Jost
Fri Sep 04, 2020 11:19 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Monochrome Camera / Techniques?
Replies: 47
Views: 2828

Re: Monochrome Camera / Techniques?

I don't see any way to hide the presence of a Bayer filter unless color is perfectly constant. You can eliminate the Bayer filter's mosaicing effect by using 4-shot pixel shifting camera like the Pentax k-1. That can be treated as a monochrome camera, and the cheapest FF monochrome by far. For macr...
by Lou Jost
Thu Sep 03, 2020 6:00 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Monochrome Camera / Techniques?
Replies: 47
Views: 2828

Re: Monochrome Camera / Techniques?

I have a monochrome Micro Four Thirds camera with cooled sensor. I run it with the sensor below zero centigrade, and this makes a big difference. If you get a monochrome camera, I recommend you get a cooled one. I bought mine several years ago so there are surely better ones out there now. The huge ...
by Lou Jost
Thu Sep 03, 2020 5:59 am
Forum: Equipment Discussions
Topic: Another questionable eBay listing
Replies: 14
Views: 1227

Re: Another questionable eBay listing

Chendata sold a 1x lens he called "16k line-scanner", it's an old 8k reproduction lens. Yes, that's the kind of thing I was talking about above with respect to Chendata. Decent stuff but not carefully described. I think he did sell the 3.5x Rayfact but did not say it was 3.5x. I think I had to look...
by Lou Jost
Thu Sep 03, 2020 5:48 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Large format macro tests
Replies: 35
Views: 1725

Re: Large format macro tests

with enough resolution and sharpness that every die marker can be seen clearly Lou, your reply came in while I was writing my reply to Rik. Does the above help in understanding, or is the 100% IQ requirement still unclear? THis is the part you've been leaving out. Your main criterion is NOT just th...
by Lou Jost
Wed Sep 02, 2020 8:52 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Large format macro tests
Replies: 35
Views: 1725

Re: Large format macro tests

There has to be something else in your criterion, Ray. You can always get 100% sharpness from an image if you downsample it enough. But that's losing information, and you agreed that is bad. You must have some additional constraint that you are following. Maybe "100% sharpness on a high-end consumer...
by Lou Jost
Wed Sep 02, 2020 6:57 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Large format macro tests
Replies: 35
Views: 1725

Re: Large format macro tests

I think high resolution is an important quality in nature photography. I want people to forget that they are looking at an image; I want them to be able to run their eyes over the textures and details that are an essential part of an organism's beauty, as if they were examining the thing itself. In ...
by Lou Jost
Wed Sep 02, 2020 5:58 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Large format macro tests
Replies: 35
Views: 1725

Re: Large format macro tests

I want to archive them digitally, though I also dream of someday making big exhibition prints. Exhibitions often have prints more than a meter wide, and allow a close approach to examine details. One of my friends made prints almost 2 meters high for an exhibition that I introduced in Amsterdam. The...