Search found 4579 matches

by Lou Jost
Wed Sep 02, 2020 5:01 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Large format macro tests
Replies: 35
Views: 1648

Re: Large format macro tests

For sure I have tried pushing the envelope to capture as much image detail as possible, but with the same end goal...to get the best 100% pixel-level detail. I think you are leaving out something important about your goal. If that was really your goal, you would have stopped with a low-megapixel se...
by Lou Jost
Wed Sep 02, 2020 3:16 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Large format macro tests
Replies: 35
Views: 1648

Re: Large format macro tests

We differ on what we mean by "image quality". I am discussing the quality of the aerial image that the sensor is trying to capture. For that, obviously, "sharp at 100% resolution" is not an adequate criterion, because you could easily ahieve that with any reasonable lens if you used a low-megapixel ...
by Lou Jost
Wed Sep 02, 2020 3:02 pm
Forum: Equipment Discussions
Topic: Another questionable eBay listing
Replies: 14
Views: 1171

Re: Another questionable eBay listing

Yes I do remember that. I recall the price was good.
by Lou Jost
Wed Sep 02, 2020 12:56 pm
Forum: Equipment Discussions
Topic: Another questionable eBay listing
Replies: 14
Views: 1171

Re: Another questionable eBay listing

I've bought something from Chendata, and it was in great condition. He also seems knowledgable. But there is something a little dishonest (perhaps not intentionally) about many of his listings. For example, he is currently selling a Linos 608 lens which he more or less claims is an industrial varian...
by Lou Jost
Wed Sep 02, 2020 12:08 pm
Forum: Equipment Discussions
Topic: Another questionable eBay listing
Replies: 14
Views: 1171

Re: Another questionable eBay listing

Maybe I am mis-remembering. Scary dishonesty in any case.
by Lou Jost
Wed Sep 02, 2020 11:50 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Large format macro tests
Replies: 35
Views: 1648

Re: Large format macro tests

It is not so easy to get a good looking 100% image, even if your camera is only 5MP. You're right. But as we've discussed before, the 100% criterion is artificial and makes no sense as a judge of image quality, though it may make sense in practice if your target is users who always zoom in to 100%....
by Lou Jost
Wed Sep 02, 2020 11:01 am
Forum: Equipment Discussions
Topic: Another questionable eBay listing
Replies: 14
Views: 1171

Re: Another questionable eBay listing

I wondered about thatRayfact listing. When I saw it, there were six available.
by Lou Jost
Wed Sep 02, 2020 10:29 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Large format macro tests
Replies: 35
Views: 1648

Re: Large format macro tests

Most everyone on the web zooms to 100%, which is why I place such a high premium on high IQ at 100% Yes I know, that's why I mentioned "web clients who automaticallly zoom in to 100%". But it should be obvious that this is not, by itself, a valid indicator of lens or image quality. Otherwise we'd a...
by Lou Jost
Wed Sep 02, 2020 9:13 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Large format macro tests
Replies: 35
Views: 1648

Re: Large format macro tests

Lest this result seem too obvious, I think we all agree that for m large enough, these two images will be equally blurry, due to empty magnification. I'd like to see where that happens.
by Lou Jost
Wed Sep 02, 2020 9:05 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Large format macro tests
Replies: 35
Views: 1648

Re: Large format macro tests

Yes, but that's real loss. Remember we're comparing same FOV on the two images, and that's what counts (unless you have web clients who automaticallly zoom in to 100% without thinking about what they are looking at). If both images were printed at the same size, this is what they would each look lik...
by Lou Jost
Wed Sep 02, 2020 8:27 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Large format macro tests
Replies: 35
Views: 1648

Re: Large format macro tests

Yes, though not stacked, both are single shots.
by Lou Jost
Wed Sep 02, 2020 6:03 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Large format macro tests
Replies: 35
Views: 1648

Re: Large format macro tests

I should add that a similar cpomparison at medium format shows that a medium-format image without pixel-shifting is only slightly better (in terms of resolution) than a 35mm image of the same FOV with 8-image pixel shifting.
by Lou Jost
Wed Sep 02, 2020 5:58 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Large format macro tests
Replies: 35
Views: 1648

Re: Large format macro tests

No. I'm comparing equal fields of view in single optical images. In one case, the optical image is 5 inches across, made by a large format lens, and in the other case, the same field of view is contained in an optical image 36mm across made with a modern macro lens designed for small sensors. The im...
by Lou Jost
Tue Sep 01, 2020 7:33 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Large format macro tests
Replies: 35
Views: 1648

Large format macro tests

I used to do large format semi-macro photography in the old days of film, and I loved it. I lost all of that equipment years ago. But nowadays all the equipment I used to dream about back then is dirt cheap on eBay, since no one wants it. I've accumulated a Horseman 4"x5" view camera, numerous adapt...
by Lou Jost
Tue Sep 01, 2020 7:57 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Eastern Tiger Swallowtail
Replies: 3
Views: 666

Re: Eastern Tiger Swallowtail

Are the eye patterns perhaps a drying artifact?