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Yeah, I see what you mean. Unfortunately the background being 1 stop brighter has made this particular test inconclusive as you suggested. If you have the time and inclination it would be great to see the same results in a pitch black room (with matt black material in background if you have...

Probably obvious but make sure if you apply any settings ie contrast, brightness etc in processing that the same adjustments are applied to both frames. Thx,M

Excellent! That would work a treat then. Good test...cant wait to see the pics. No rush, just when have some time. Thanks, mark

This sounds very interesting and I would love to see the results! It looks as though you did everything right. It was a good idea to test the same laser by reducing its power with a 1 stop filter. The only question would have to be what kind of filter did you use? I would think it would have to...

Hi, thanks for doing the test. Did you use the same camera settings for all the pictures (f? @ 10seconds, ISO?). If so, and you are interested and don't mind having a play...it would be interesting to see if you could match the 5mW's beam brightness by giving it a 40 second exposure. Technically...

Thanks for answering all my questions and explaining how Chinese laser companies market their products. That is good to know and obviously helps when working trying to work out what to get. Cheers, Mark

Thanks so much for answering my questions with so much detail. Your input is greatly appreciated and has allowed me to make an informed decision. I think this laser would be great for taking beam shots that are parallel to the horizon/perpendicular to where the camera is facing. I've found that...

hey thanks for taking a look into this. Would be great to know how the camera 'records' it. If your camera has a 'manual mode' you should be able to play with the shutter speeds to work out the difference in stops. Thanks again for having a play. Cheers, Mark

Hi, thanks for the link which was very interesting. I guess its just a matter of working out whether "Relative Perceived Brightness" translates into photographic terms. It does support the theory that at least output power is based on perceived brightness. I am not sure how that fits in with...

Hi, sorry if my question wasn't clear, however you got the gist of it. Yes, that is what I am asking but I was hoping for an answer in photographic terms. For example, if I exposed a 532nm green 200mW for say 30 seconds to give me my optimum laser beam exposure. Technically if I then did the...

I have done a search for this but could not find the answers I wanted. It would be great to get some help with this from anyone who is willing to explain something that I am sure is quite basic to all you experts, but difficult for someone new to the field to get my head around. I am trying to...

Thanks, that is also a good shout and I like that it will operate for 2-3 minutes. I agree with you, the PL and HL are probably a bit bright for long 4-8 minute exposures. What I did like however was the ability to vary the amount of time the lasers were on for to give me different results ie...

I am seriously thinking about this laser that you recommended now. Do you know what the duty cycles are for these lasers? Would be great to know...ideally need 4-8 mins on, same amount off. Thanks again, mark

Hi there, A couple of days ago I joined the group and introduced myself. Yesterday I posted the below in the Multimedia Forum. I have received some good recommendations so thanks guys for those. I was wondering if anyone else had any opinions of the lasers recommended, or some other...

Thanks for the recommendation, that is def another option to throw in the mix. Would the wider beam affect how long the beam would travel for? Also, how long is the duty cycle of these lasers in your experience? Cheers, M

Thanks so much. Its just a first test with no retouching done so I am confident I can get the balances a bit better when I do the real thing.

Hey, thanks so much for your reply yesterday and especially the comments on my work. It is always nice to hear positive feedback. I have just checked out the '150mw 520nm (green) direct diode laser' from Jetlasers and it certainly fits the bill as far as beam diameter goes. Would having a wider...

Thanks for all the warm welcomes everyone.

Where are you based?

I think they were just very happy to be informed of what I was doing, where and when the test was taking place. The Sergeant also asked me to inform the police helicopter service who I guess may have seen it from the air. It was the start of a new photo project so the last thing I wanted was to...