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 Replies: 48 / Views: 7,428 |
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Valued Member
Russian Federation
172 Posts |
Last couple days I've read a bunch of bad stuff about Keyence lenses.
Ray, give me the link please for curiosity. Keyence made a lot of different lenses and ppl can use it inappropriate way.
Initial price of each lens I pointed avove is close to $1000 with passport resolution 3,4um
I have this one but not tested yet. My pic was shot with lens resolutin no better than 10um.
Yes Ca-LHR series is better, but too hard to find.
Edited by Justwalking
04/22/2019 8:13 pm
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Pillar of the Community
 United States
4038 Posts |
Contact me for photographic equipment or visit my home page at: http://macrocoins.com |
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Valued Member
Russian Federation
172 Posts |
Don't know what kind and condition of the lens was used by Curious Fox. May be he attached C-mount to FF and did the crop or may be stop down beyond the optimal aperture to increase DoF and lost contrast and sharpness... Who knows? There a lot of another opinions about Keyence quality.
Their talk not about specific lens and more about math alghorithm on very specific and very high level Keyence hardware.
The Dof is function of magnification and effective f-number, not anything else.
The big Dof on small sensor is due to small sensor have enough pixels in 2/3" area to resolve the lense resolution. To have same amount of pixels across FF we need to take 5X more magnification on the same field of view (FoV) with the same MP sensor for the same picture resolution. So the Dof at macro will be 25 times less, with the same effective f-number (exluding Circle of Confusion factor from odd negative and paper era). That's all trick.
Edited by Justwalking
04/23/2019 3:27 pm
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Pillar of the Community
United States
4038 Posts |
The problem I've had with the USB cameras is their terrible software. They typically have poor control over exposure, white balance, etc. I personally hesitate to purchase another USB camera without verification the software gives me good control over critical parameters.
Contact me for photographic equipment or visit my home page at: http://macrocoins.com |
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Valued Member
Russian Federation
172 Posts |
Yes, such cameras with own professional software cost much more https://www.ebay.com/itm/OMAX-14M-P...400794355661But it is only alternative for those who need more or less good close up pics for web like this board, not for exibitions or the printed catalogs. It can save hundreds bucks for stacking hard and soft per DSLR Edited by Justwalking
04/23/2019 9:50 pm
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Pillar of the Community
United States
4038 Posts |
Hah! I have one of those OMAX cameras, and the software sucks. This is one of the USB cameras I have tried, with little success! Have you tested one of these cameras?
Contact me for photographic equipment or visit my home page at: http://macrocoins.com |
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Valued Member
Russian Federation
172 Posts |
No. I'm satisfied with mine soft. If I don't like something I always can correct it in postprocessing. But in 3/4 cases I do nothing and second that photography is not main goal for me. Mostly I use it as HDMI video whithout delay for live picture on big TV screen. Just point and shoot when I want it like this dandelion   or coin ) Edited by Justwalking
04/23/2019 10:35 pm
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Valued Member
Russian Federation
172 Posts |
Trying Keyence Ca-lm0510 on 1c F/2.8, w.d.=130mm, ~0.6X One 1Watt led  1X F/2.8 w.d.=90mm, slant to camera  1x F/4  Edited by Justwalking
04/24/2019 7:13 pm
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Pillar of the Community
United States
4038 Posts |
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Pillar of the Community
United States
4038 Posts |
Ahh, it's the same one linked before, with $90 pricing. Looks pretty good.
Contact me for photographic equipment or visit my home page at: http://macrocoins.com |
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Pillar of the Community
United States
4038 Posts |
Can you do an aperture sweep with that lens, and show 100% crops? I think the camera you're using probably has 1.3um pixels, correct? Will be good to see what the details look like and how far you can push aperture before getting fuzzy. Maybe do this at 0.5x mag?
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Valued Member
Russian Federation
172 Posts |
Getting fuzzy from f/8 and higher as most of any other lenses. There smooth aperture ring from f/2.8 to close. It is 100% crop from the middle pic above  Edited by Justwalking
04/25/2019 09:34 am
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Pillar of the Community
United States
1353 Posts |
Using a Celestron pro model 44308.....can't get the lighting right....any suggestions.
Also is there better software then the capture pro. Thanks all in advance.
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Valued Member
Canada
276 Posts |
Quote:
Using a Celestron pro model 44308.....can't get the lighting right....any suggestions.
Also is there better software then the capture pro. Thanks all in advance. I use the same Celestron model for my coins. I do not use the built in LED light on the Celestron. I use 2 LED desk lamps ( search Amazon), that have 3 brightness settings, and configure the brightness setting depending on the toning of the coin. I position one or both lamps over or beside the Celestron. I take the photo with capture pro and use an image editor later on. I am not sure if there is other better software than capture pro for the Celestron. I use ACDSee image editor for my coin photos. Yes, you have to pay for it. Resize, Full 360 degree rotation at the palm of your hand, Lighten, Darken, Contrast, Cut, Paste, etc. Edit: I just found out there is a free edition of ACDSee without some of the bells and whistles. If you have Windows 10 installed on your computer/laptop etc., there is Paint 3D for free. Edited by the_sifu
05/01/2019 1:38 pm
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Valued Member
Canada
276 Posts |
Here is an example of a Canadian coin taken with the Celestron, with one LED lamp overhead on high brightness.   Edited by the_sifu
05/02/2019 9:56 pm
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Replies: 48 / Views: 7,428 |
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Posted 04/23/2019 10:40 am
