Ha! While I was a'huntin an a peckin' away, PB has carried the torch forward with a lot briefer summary as to what such a request really means. Well, there is a lot more to tell so I'll just leave the rest below "as is".
Originally Posted by zheka
Is there any chance you could take a picture with flash standing 8 feet or so in front of the projector? It may be better to detect hot spotting at this stage if it is indeed present.
You may have to close the garage door though. Ideally, the screen should be illuminated evenly by the ambient light.
Using a Flash to detect Hot Spotting is like using a Match to look for a Gas leak.
And especially on a screen that is just hours old and wholly uncured.
Barring that, a Flash from any source except professional Reflector arrays is going to be a narrowly focused, instantaneous beam, and it's intensity will, (...and almost every P&S today does....) governed by distance and room conditions.
That in no way represents anything remotely like what a screen would ever work with, owing the the whole purpose of PJ optics is to create uniform light dispersion.
And if the object here to try to show that a high gain screen will show a bright center when hit with a Flash that amounts to perhaps 3x+ the intensity of a PJ's lamp at any given point........to that I say it should be obvious what would happen. In the same regard, under the same assault, any Screen so low in gain that it could suppress such a Flash and show no effect would show that it was indeed, a suppressive medium, and it's only real accomplishment it attenuating light across the board.
But gosh, what if a Screen like SF does not seem to show any "hot Spotting" during a regular showing of content. Well the next step in the ongoing attempt to find something wrong is to take a Photo (OMG!) of the Screen under a Blue Screen, or other mono field, and then show it in "Negative" fashion. Then, what the eye doesn't see, nor the normally exposed photo's image would show, is the small degree of non-uniformity around the "EDGES"....just like about 98% of all Screens. This effort has been made to mislead opinions and is touted as "proof" when in fact, and once again taking into account that SF is a high gain High Contrast application, the shown results are not to be considered poor or detrimental.
Unless some want to try to make it seem that way.
It is this disparity between what those who test to disprove and discount try to present as "fact" and what is really going on behind the scenes. Considering the source, and reputation, and the fact that all such tests are happily provided by "Off Forum" members whose motives cannot be mistaken, It is not hard at all to reason why the vast majority of actual SF End Users post completely different accounts.
A real issue is how these tests are done and presented is intended to force those who have absolutely no clue as to what is going on to accept them on the weight of "Their Word". What is proposed here is based on far more experience and member involvement. This Forum maintains a adherence to purist DIY principles, and not because it's always the easiest. It is to effectively divide the two Camp...Mfg and DIY, and both encourage creativity in DIY, while also keeping DIY from intruding on Mfg Screen.
Oh yes! There was a time when the Screens forum was dominated by DIY postings. And believe this....the DIY Screens being done did not involve using a hybrid of DIY / Mfg. And this did not come about because the DIY Screens were under performers. In any case, to make the Forum a better, more congenial place, the DIY and Mfg camps were split. You would think that some would "get this" since there is in fact a Forum / Sub Forum in place.
Whatever........it still remains to be said that dubious or misleading "test standards" do nothing to convey what actual use can. This Forum is about working to help every requester achieve what is best for his own situation. It's not about making attempts to save people from what a extremely small member of people personally consider a bad thing. The request to the OP amounts to baiting him to try something that would at best confuse him.
So here's a good chance to show what's real and what is not.
The OP is certainly going to use his Screen. he might, with enough urging, try some of the nonsensical tests that are suggested. I'm not worried. I will wait until he gets his PJ up and running, and the project will rise or fall based on his evaluation. Not screen captures one of you get and reverse.