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Chronos User Discussion / What is the sensor size of the 1.4 Monochrome version?
« on: July 14, 2020, 08:28:01 PM »
What is the sensor size of the 1.4 Monochrome version?
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32
Chronos User Discussion / Re: Chronos 1.4 Footage Thread
« on: June 22, 2020, 04:31:27 PM »
@PaulBryanTV
I'm planning to buy a Chronos 1.4 black and white to video water sprays and similar. I really enjoyed watching the video you posed at the beginning of this thread of water hitting a spoon and then spreading out. What frame rate did you use?
Thanks!
I'm planning to buy a Chronos 1.4 black and white to video water sprays and similar. I really enjoyed watching the video you posed at the beginning of this thread of water hitting a spoon and then spreading out. What frame rate did you use?
Thanks!
33
Chronos User Discussion / Re: Extracting still images
« on: June 22, 2020, 03:55:42 PM »
Thanks. You are someone who has decades of hands-on experience, whereas I am a total novice. I don't want to damage my lens by trying some of these things.
I could still try the to use extension tubes with my lens on the Kronos 1.4, couldn't I?
I could still try the to use extension tubes with my lens on the Kronos 1.4, couldn't I?
34
Chronos User Discussion / Re: Extracting still images
« on: June 22, 2020, 03:38:30 PM »
Yes, thanks for the explanation.
What about setting the Fstop if I use a retroadapter? How am I going to do that since the lenses I have do not have aperture rings?
Here's a video of a guy who compared the Raynox DCR 250 with extension tubes and with a macro lens. He thinks the sharpness is very good, although the macro is a bit sharper.
https://www.youtube.com/watch?v=mYRZsmsI5Ec
What about setting the Fstop if I use a retroadapter? How am I going to do that since the lenses I have do not have aperture rings?
Here's a video of a guy who compared the Raynox DCR 250 with extension tubes and with a macro lens. He thinks the sharpness is very good, although the macro is a bit sharper.
https://www.youtube.com/watch?v=mYRZsmsI5Ec
35
Chronos User Discussion / Re: Extracting still images
« on: June 22, 2020, 01:55:28 PM »
Interesting that when googling the retroadapter ring, most of what comes up is from Germany. Even on American eBay I only saw these rings, by themselves, sold from Germany. Further, virtually all of the videos explaining the concept that result from a search are in German. Not that it matters, just curious if American sellers do not support this type of ring or is there some other reason.
Anyway, I watched a German video where the guy compared this retroadapter ring with the raynox dcr-250. I understood most of it although I'm not familiar with most of the "camera-specific" German words. If I understood correctly, the raynox dcr-250 just snaps onto the front of the lens and does not mess with the contacts, so I can continue to set the aperture as I do now. The retro adapter requires the lens to be reversed, which seems strange, but I guess also means that I will have an issue with the aperture since my 50 mm lens does not have an aperture ring. What's your opinion of the raynox dcr-250? Below is a link to the video I watched.
https://www.youtube.com/watch?v=x6s3MlzwdZg
https://www.youtube.com/watch?v=x6s3MlzwdZg
Anyway, I watched a German video where the guy compared this retroadapter ring with the raynox dcr-250. I understood most of it although I'm not familiar with most of the "camera-specific" German words. If I understood correctly, the raynox dcr-250 just snaps onto the front of the lens and does not mess with the contacts, so I can continue to set the aperture as I do now. The retro adapter requires the lens to be reversed, which seems strange, but I guess also means that I will have an issue with the aperture since my 50 mm lens does not have an aperture ring. What's your opinion of the raynox dcr-250? Below is a link to the video I watched.
https://www.youtube.com/watch?v=x6s3MlzwdZg
https://www.youtube.com/watch?v=x6s3MlzwdZg
36
Chronos User Discussion / Re: Extracting still images
« on: June 22, 2020, 12:36:05 PM »
Hi Nikon1:
I will most likely be buying the Chronos 1.4 (black and white) in July. Which lens do you recommend for my needs. Is there an adapter that will allow me to use the Nikon 50 mm prime that you recommended for my photo camera and which I do have. As you know I need sharp images.
Also, do you have any recommendations for video editing software that provide excellent sharpening and noise reduction.
Thanks.
I will most likely be buying the Chronos 1.4 (black and white) in July. Which lens do you recommend for my needs. Is there an adapter that will allow me to use the Nikon 50 mm prime that you recommended for my photo camera and which I do have. As you know I need sharp images.
Also, do you have any recommendations for video editing software that provide excellent sharpening and noise reduction.
Thanks.
37
Chronos User Discussion / Re: Extracting still images
« on: June 22, 2020, 12:01:56 PM »
Hi Photopage:
Sorry for the late reply. Thanks for taking the time to try to verify the exposure.
In looking at the pictures, I am confused. If each still is one microsecond exposure, why aren't the images much clearer. In looking at the images, I have no idea what I'm looking at.
Thanks.
Sorry for the late reply. Thanks for taking the time to try to verify the exposure.
In looking at the pictures, I am confused. If each still is one microsecond exposure, why aren't the images much clearer. In looking at the images, I have no idea what I'm looking at.
Thanks.
38
Software Dev / Re: Chronos V0.4.0 Beta - Debian and Networking
« on: May 02, 2020, 09:59:24 AM »
"The shutter speed can be set regardless but the issue is the amount of light required. David said figure 7 Lux per FPS. I presume that’s at 360 deg shutter so even way more light at higher shutter speeds. As long as the file remains on github, you can use it. Download it now and save it in anticipation of getting a camera. I’ll check and confirm tomorrow."
Thanks. I reread this thread and it looks like the Voyager release on 3/31/2020 supports a minimum vertical height of 32. I'm not sure, but I think that corresponds to a 109,000 fps when the horizontal is 320 or maybe it is 336.
Thanks. I reread this thread and it looks like the Voyager release on 3/31/2020 supports a minimum vertical height of 32. I'm not sure, but I think that corresponds to a 109,000 fps when the horizontal is 320 or maybe it is 336.
39
Software Dev / Re: Chronos V0.4.0 Beta - Debian and Networking
« on: May 01, 2020, 01:32:03 PM »
If I buy a Chronos 1.4 camera now and receive it in a month or so, will the "unstable" version still be available so I can film at 109,000 frames per second? Also, it is critical that I have an exposure time of around 1 microsecond. Can the exposure time be set to around 1 microsecond throughout the entire range from 1000 fps to 109,000 fps?
40
Chronos User Discussion / Re: Extracting still images
« on: May 01, 2020, 10:13:54 AM »
"The 2.1 can shoot with exposures down to a micro second. I just tested it."
I've pretty much decided that I am going to buy one of the cameras. The datasheet for the 2.1 says that the minimum exposure time is 10 microseconds and not 1 microsecond. Would you please confirm that you were able to get 1 microsecond?
Also, is the fps really limited to 24,046 per the datasheet? It seems odd for a higher resolution camera and given that the initial announcements for the 2.1 said the camera would be able to shoot 100K fps.
Thanks.
I've pretty much decided that I am going to buy one of the cameras. The datasheet for the 2.1 says that the minimum exposure time is 10 microseconds and not 1 microsecond. Would you please confirm that you were able to get 1 microsecond?
Also, is the fps really limited to 24,046 per the datasheet? It seems odd for a higher resolution camera and given that the initial announcements for the 2.1 said the camera would be able to shoot 100K fps.
Thanks.
41
Chronos User Discussion / Re: Extracting still images
« on: April 27, 2020, 08:16:37 AM »
Once again thanks for taking the time to help me understand in my own mind what it is I really need. I'm beginning to realize that what I really need is sharpness. Resolution is a part of that but so is acutance. Acutance is most likely a bigger issue for me since focusing on the region of spray interest is difficult. So, it's quite possible that a 1.3 MP image with an exposure time of 1 microsecond might be perfectly acceptable compared with my 25 MP still photographs with an exposure time of 24 microseconds (using the Nikon flash). If you don't mind, I would like to continue our discussion privately where i can include some photos that I currently have.
Again thanks for your help.
Again thanks for your help.
42
Chronos User Discussion / Re: Extracting still images
« on: April 26, 2020, 08:19:26 PM »
After doing a little research, it seems to me that if I want to compare my still photos at 25 megapixels with the Chronos 1.4 all I have to do is multiply the Chronos resolution to get megapixels.
So, the best resolution for a Chronos 1.4 is 1280 x 1024 at 1057 FPS. So the megapixels is 1.3 MP, isn't it?
Also, I've been looking on ebay for the Computar lens that Kron has listed as an extra. On eBay a Computar TV Zoom Lens like the kind recommended can easily be found for under $100. One ad even lists it as a "Chronos 1.4 Computar 12.5-75MM f1.2 Lens" for $81.
I admit to knowing nothing about video and what to expect for resolution. However, with such cheap lenses, it seems to me that the quality of an extracted still frame would be sorely lacking compared with a DSLR at 25 or 50 Megapixels when the picture is taken with a 1 microsecond flash. I'm not trying to be critical, just trying to understand so that my expectations are inline with reality. Is my analysis correct, or am I missing something?
Thanks.
So, the best resolution for a Chronos 1.4 is 1280 x 1024 at 1057 FPS. So the megapixels is 1.3 MP, isn't it?
Also, I've been looking on ebay for the Computar lens that Kron has listed as an extra. On eBay a Computar TV Zoom Lens like the kind recommended can easily be found for under $100. One ad even lists it as a "Chronos 1.4 Computar 12.5-75MM f1.2 Lens" for $81.
I admit to knowing nothing about video and what to expect for resolution. However, with such cheap lenses, it seems to me that the quality of an extracted still frame would be sorely lacking compared with a DSLR at 25 or 50 Megapixels when the picture is taken with a 1 microsecond flash. I'm not trying to be critical, just trying to understand so that my expectations are inline with reality. Is my analysis correct, or am I missing something?
Thanks.
43
Chronos User Discussion / Re: Extracting still images
« on: April 26, 2020, 06:48:35 AM »
Nikon1:
Thank you for your reply. Yes, the Vela One is a flash unit that will flash as short as 0.5 microseconds and my plan is to take pictures in darkness using the flash and a DSLR Camera. However, I'm thinking that, down the line, I might want to have high-speed video as well, so I'm investigating whether or not I can kill two birds with one stone by purchasing a Chronos camera. The company that produces the Vela One is currently not manufacturing due to the pandemic and is completely sold out of the flash unit.
I have been taking pictures of a special type of water spray with a DSLR capable of 25 megapixel resolution and a Nikon SB-800 flash capable of a flash as short as 24 microseconds. I have been getting some high quality still images, but need shorter "exposure" times since the water travels at least 120 microns during the 24 microsecond exposure.
Do you know if there is anyway to compare the "resolution" of a still image extracted from video taken with a Chronos camera with the resolution of a DSLR camera? So 25 or 50 megapixels for the DSLR for a still image versus
for a Chronos camera.
Regards.
Thank you for your reply. Yes, the Vela One is a flash unit that will flash as short as 0.5 microseconds and my plan is to take pictures in darkness using the flash and a DSLR Camera. However, I'm thinking that, down the line, I might want to have high-speed video as well, so I'm investigating whether or not I can kill two birds with one stone by purchasing a Chronos camera. The company that produces the Vela One is currently not manufacturing due to the pandemic and is completely sold out of the flash unit.
I have been taking pictures of a special type of water spray with a DSLR capable of 25 megapixel resolution and a Nikon SB-800 flash capable of a flash as short as 24 microseconds. I have been getting some high quality still images, but need shorter "exposure" times since the water travels at least 120 microns during the 24 microsecond exposure.
Do you know if there is anyway to compare the "resolution" of a still image extracted from video taken with a Chronos camera with the resolution of a DSLR camera? So 25 or 50 megapixels for the DSLR for a still image versus
for a Chronos camera.Regards.
44
Chronos User Discussion / Extracting still images
« on: April 25, 2020, 07:15:52 PM »
I am thinking about purchasing a Chronos camera. I need super slow motion video, but I also need 1 microsecond still images. I have emailed Sebastian at Kron and he replied as follows:
"I think the best method of extracting a still image from the camera is by saving the file as cinemaDNG. This will create a folder on your card containing a number of still adobe dng images that can be opened as a single image in your preferred photo post processing software or as a video sequence in your preferred NLE software by importing the whole folder.
One note when saving cinemaDNG files on the camera, they are much more data heavy (h.264 is up to 60Mbps, cinemaDNG is 1258Mbps) and the save time will be much longer. I recommend using a SSD if you wish to save cinemaDNG files since the transfer rate is much faster than the SD card."
Has anyone tried this? How good is the resolution of the image. Another choice I have is to try to buy a Vela One flash (as low as 0.5 microsecond), but they are not producing flash units at the moment. I feel confident that the Vela one will provide a very good image, but I thought I should maybe consider the Kron cameras since I would like to have super slo mo video as well.
Any advice is appreciated. Thanks.
"I think the best method of extracting a still image from the camera is by saving the file as cinemaDNG. This will create a folder on your card containing a number of still adobe dng images that can be opened as a single image in your preferred photo post processing software or as a video sequence in your preferred NLE software by importing the whole folder.
One note when saving cinemaDNG files on the camera, they are much more data heavy (h.264 is up to 60Mbps, cinemaDNG is 1258Mbps) and the save time will be much longer. I recommend using a SSD if you wish to save cinemaDNG files since the transfer rate is much faster than the SD card."
Has anyone tried this? How good is the resolution of the image. Another choice I have is to try to buy a Vela One flash (as low as 0.5 microsecond), but they are not producing flash units at the moment. I feel confident that the Vela one will provide a very good image, but I thought I should maybe consider the Kron cameras since I would like to have super slo mo video as well.
Any advice is appreciated. Thanks.