tag:blogger.com,1999:blog-2599082310926453927.post7830477643640935414..comments2024-02-26T14:48:08.264+01:00Comments on Falk Lumo: K-7 as a movie camera -- PART II: Controlling video recordingFalk Lumohttp://www.blogger.com/profile/00476649880132648032noreply@blogger.comBlogger13125tag:blogger.com,1999:blog-2599082310926453927.post-85470794846374634102011-07-19T12:09:37.462+02:002011-07-19T12:09:37.462+02:00> does all this work also with K-5?
AFAIK: yes ...> does all this work also with K-5?<br />AFAIK: yes :)Falk Lumohttps://www.blogger.com/profile/00476649880132648032noreply@blogger.comtag:blogger.com,1999:blog-2599082310926453927.post-78263888251207974862011-07-19T11:14:41.061+02:002011-07-19T11:14:41.061+02:00does all this work also with K-5?does all this work also with K-5?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2599082310926453927.post-67428360286695568362010-10-31T20:28:18.093+01:002010-10-31T20:28:18.093+01:00Hi Falk,
You are right: an M-lens closes the apert...Hi Falk,<br />You are right: an M-lens closes the aperture nicely during recording. Since auto focus is barely an option the superior M-focussing is fantastic. Once again a reason to enjoy the old glass!<br />I'll certainly experiment with your tip to use AE-L and manual aperture to switch between differently lighted zones... with the 50-500 Bigma using it's aperture ring!<br />Thanks again, ArieArie Kraaihttp://aarslog.persijn.net/alog_p/noreply@blogger.comtag:blogger.com,1999:blog-2599082310926453927.post-11242918803583409582010-10-27T15:28:01.299+02:002010-10-27T15:28:01.299+02:00@Arie,
I don't know where you've read this...@Arie,<br />I don't know where you've read this. Certainly not at falklumo ;) With an M-lens, or an A-lens with the aperture ring set to non-A, the aperture can be controlled throughout the video and the lens will open and close accordingly. Combined with AE-L, this can give dramatic effects where the automatic exposure adaption is delayed. E.g., you can expose for the background, then foreground in the shade, by changing the aperture. Maybe, there aren't many other video dSLRs which would allow you to do THAT ;)<br /><br />It is true, with an M-lens the aperture stays wide open during live view, i.e., while the camera isn't actually recording. But that doesn't matter much.Falk Lumohttps://www.blogger.com/profile/00476649880132648032noreply@blogger.comtag:blogger.com,1999:blog-2599082310926453927.post-26005833365807784402010-10-27T14:44:50.834+02:002010-10-27T14:44:50.834+02:00Thanks for your good advises!
One question: it loo...Thanks for your good advises!<br />One question: it looks like the aperture cannot be controlled using the ring on a -M lens. Does it automatically default to the biggest aperture?Arie Kraaihttp://aarslog.persijn.net/alog_p/noreply@blogger.comtag:blogger.com,1999:blog-2599082310926453927.post-3725175012677229922010-05-05T16:56:21.839+02:002010-05-05T16:56:21.839+02:00Hi rodrigo,
you can watch the exposure settings i...Hi rodrigo,<br /><br />you can watch the exposure settings in LV (still mode) and when switching to video, point at a direction were you have known (EV) settings. Then you can use +/-EV compensation and AE-Lock to select the required recording EV and lock it.<br /><br />Note that shutter and sensitivity are always provided by the camera based on aperture and EV situation (which is why I created the table above). But you can control aperture and the EV value the camera thinks it must shoot at.<br /><br />There is a thread in the video subforum at pentaxforums.com explaining how you can actually lock a KNOWN EV situation in LV mode (so you can see all recording parameters) and carry it over to video using a manual lens and USER mode. But note that while this works, the camera will still shift shutter and ISO to obtain a combination as listed in my table above.Falk Lumohttps://www.blogger.com/profile/00476649880132648032noreply@blogger.comtag:blogger.com,1999:blog-2599082310926453927.post-44434537829262410812010-05-05T15:38:28.756+02:002010-05-05T15:38:28.756+02:00Hey Falk! Thank you for this review. I have my K7 ...Hey Falk! Thank you for this review. I have my K7 since they released it and I'd love to make some video shorts with it, but I'm very jealous of those Canon users that have manual controls on their DSLRs. I read that 1/60 is the best for 30fps but how can I stablish that and mantain it as much as possible while recording? I'd also love to have my ISO under 1600 because i'ts too noisy for a decent movie and don't want postprocessing because i'd have a leak of quality and sharpness.<br /><br />This is one test I made with it:<br />http://vimeo.com/9097728rodrigohttp://www.flickr.com/photos/rodrigocarabajalnoreply@blogger.comtag:blogger.com,1999:blog-2599082310926453927.post-22120677847608255462010-02-23T23:55:36.778+01:002010-02-23T23:55:36.778+01:00Never mind. I just read your back door description...Never mind. I just read your back door description. D'oh.Real Engineernoreply@blogger.comtag:blogger.com,1999:blog-2599082310926453927.post-79373248706882519752010-02-23T23:51:36.842+01:002010-02-23T23:51:36.842+01:00Hi Falk,
Playing around with the video today I no...Hi Falk,<br /><br />Playing around with the video today I noticed that it allows exposure compensation.<br /><br />It does this without changing the aperture.<br /><br />There are only two ways I know of while keeping the aperture the same this can be done, changing the shutter speed or changing the ISO.<br /><br />It limits the range to +/-2Ev which is a pity.<br /><br />Have you done any analysis of what it changes to do this as it may be an easy way give some control one of the parameters at least?Real Engineernoreply@blogger.comtag:blogger.com,1999:blog-2599082310926453927.post-36586373381664258522010-01-06T00:56:07.469+01:002010-01-06T00:56:07.469+01:00Updated information:
A similiar exposure table fo...Updated information:<br /><br />A similiar exposure table for the Pentax K-x has now be made availabe here:<br />http://wildlifehealth.tennessee.edu/video/K-x.html<br /><br />Thanks to Coby for the great work! :)Falk Lumohttps://www.blogger.com/profile/00476649880132648032noreply@blogger.comtag:blogger.com,1999:blog-2599082310926453927.post-47988073461923160242010-01-03T22:23:49.535+01:002010-01-03T22:23:49.535+01:00Hi Falk,
I was talking about the built-in mics. S...Hi Falk,<br /><br />I was talking about the built-in mics. So in your opinion, low volume is better than high?<br /><br />I do notice that K-x records more treble and K-7 more bass if their volume is normalized to each other. But the original signal/noise ratio is higher in K-x.<br /><br />The video samples in dpreview seems to confirm my observations but they are not side-by-side comparisons. Would you mind to do an audio test or just simply make your original videos of camels available with sound recorded by built-in mics?<br /><br />Thank you very much!<br />TonyTonynoreply@blogger.comtag:blogger.com,1999:blog-2599082310926453927.post-67463943393818975892010-01-03T15:44:08.688+01:002010-01-03T15:44:08.688+01:00@Tony, well, I use the RØDE Stereo VideoMic and ev...@Tony, well, I use the RØDE Stereo VideoMic and even with the -10dB Switch I now had one recording (a live music performance) which clipped! The RØDE Stereo VideoMic has a sensitivity of 12.6 mV @ 94 dB SPL +/- 2 dB @ 1kHz without the -10dB, i.e., with 12.6 mV @ 84 dB SPL I already experienced clipping once.<br /><br />Therefore, I am really glad that the recording level is exactly as low as it is. A manually adjustable gain would be better even. All other alternatives (higher gain or automatic gain control) would be MUCH worse, though.<br /><br />I never experienced any problems in adjusting the level of noise during post processing. Most post processors / converters offer an automatic normalization of audio level which I recommend to use. The K-7 audio input has a very low noise floor. I never had an issue with noise after audio level normalization.Falk Lumohttps://www.blogger.com/profile/00476649880132648032noreply@blogger.comtag:blogger.com,1999:blog-2599082310926453927.post-73772249797698160392010-01-02T20:25:54.688+01:002010-01-02T20:25:54.688+01:00Hi Falk,
Thank you for your review. As you mentio...Hi Falk,<br /><br />Thank you for your review. As you mentioned, K-7 record volume is relatively low, which I found lower than K-x. Any thoughts?<br /><br />TonyTonynoreply@blogger.com