Kroma, LED απο την projectiondesign

[ΑΝΔΡΕΑΣ Κ.]

http://translate.google.com/transla...ews.aspx?id=15012&sl=it&tl=en&history_state0=

Αυτο το προσεξατε?

From one point of view of quality, an LED source offers a contrast ratio of infinity and the complete absence of the 'rainbow'. This means that levels of Kroma produces infinitely black blacks. "

 

[spilegou]

Απάντηση: Kroma, LED απο την projectiondesign

ωρα να (ξανα)αλλαξει ο Γενικος την υπογραφη του.......:116:

 

[Δημητρης Α]

Απάντηση: Kroma, LED απο την projectiondesign

http://quebecaudio.com/cinema-maison/the-avielo-kroma-by-projectiondesign.shtml

το παρουσιαζουν αυτες τις μερες 21-24 Μαιου στο Μοναχο.Ακουσε κανεις κανενα σχολιο?

 

[ΑΝΔΡΕΑΣ Κ.]

Απάντηση: Kroma, LED απο την projectiondesign

Aπο την εκθεση του Μοναχου και απο επανω αριστερα:
Kroma, Optix, Helios

 

[ΑΝΔΡΕΑΣ Κ.]

Απάντηση: Kroma, LED απο την projectiondesign

Να και τι εγραψαν στο αμερικανικο φορουμ

As stated before from another forum member, this was shown on a rather small screen (non-scope, hence no anamorphic lens), while the Helios and Optix were on a larger (I'd say around 1m wider, maybe a tad more) scope screen.

My personal impression, I thought the image was somewhat dim, even for the rather small screen size. It clearly lacked a little punch in some scenes. Black level could have been better, as one could clearly see on the black letterbox bars on Quantum of Solace. Ansi CR was excellent, nothing to complain here. Colors were overall nice, not overblown as we've probably all seen from LED before. Others in the room however said it was bright enough and black levels were ok. Maybe I'm expecting too much? I don't know.

Now regarding rainbows... they're finally gone. I'm very sensitive to rainbows and I have yet to see a 1-chip DLP where rainbows didn't annoy me. I can see them on the Optix as well, but it's far better in that regard than Marantz, Sim2 and others.

But back to the Kroma. Yes the rainbows are gone, but I could see other color seperation artifacts, which only showed on white objects on a very dark background during pans. They look different from rainbows, but very annoying as well. Some people have been reported before about color seperation artifacts on 3-chip DLPs, created by the PWM of the DMD. I've never seen those under normal viewing conditions, but what I've seen on the Kroma looks just like that. There's no color wheel in the Kroma, so maybe this was created by turning on/off the LEDs. Personally, this would be a deal killer for me. But again, I'm very sensitive to these kind of artifacts, so anyone who can live with a 1-chip DLP won't have any issue with this one.

Maybe PD will be able to fix it by increasing the refresh rates and LED cycles, similar to what incresed color wheel speed has done for regular 1-chip DLPs. Guess we'll have to wait and see.

Technical specs are correct so far. 600 lumens at 2000:1 on/off CR and somewhere in between 200 to 300 lumens at the max CR of 7500:1.

According to PD, the Kroma was not on it's highest lumens setting when they showed it off. Probably that's the reason I thought it was a little dim. It was shown at around 7ftL, but it looked more like 10 to 11ftL to me. So yes, it does look brighter than one would expect.

Ansi CR: As stated above I thought it did very well in this area, but the PD rep claimed it is only 300:1 and there would no other projectors having a higher ansi cr than this. I then specifically asked about projectors like the Lumis (which can have around 1000:1 with the T3 lens), units from DPI and the Barco DP1200. Again, he insisted there are no projectors with ansi cr over 300:1. Another PD rep I spoke to later mentioned 500:1, so take this with a grain of salt. I have no number here, but in their setup it didn't look that much different to me from what I've seen on a Lumis with a T2 lens.

LED: As mentioned before, you could run this projector 24/7 for about 11 years before the LEDs die. Nothing to complain about here, but they need more light output in my opinion. Price is €23k (a little over $32k), I think without the lens, as the Optix is cheaper at just under €20k without lens.

Lens adds another €4k to €7k depending on lens choice, I'm not sure if there are cheaper lenses available.

Now, a little about the lenses. All lenses are designed by PD in their HQ and then manufactured by a lens manufacturer in Japan. I can't say what manufacturer, but they're very well respected in the high-end area.
Every lens is fully measured in Japan and only 5% of all manufactured lenses are within PDs specs and accepted by them. That means 95% of all lenses are rejected and end up in the garbage (or they go to another manufacturer...

). So every lens is handpicked, which assures the highest possible quality.


The Kroma did not have a anamorphic lens due to the choice of screen (rather small and 16:9). Personally I'm a ISCO guy, the ISCOIII is my lens of choice and I wouldn't go with a Panamorph at all.

I spoke to PD about the ISCO and was told they're not a fan of it, as it would soften the image of the Helios so much, but there was no other choice. Personally I've never seen that with other projectors from Sony, JVC, Marantz, Sim2, Runco and others. I would have at least expected to see that with the Sim2 HT5k, but I never have and that unit is using some serious lenses. So either they're working on their own lens which they're planning to sell or the lens of the Helios is so good, that the ISCO III can't keep up. I don't know at this point, but I'll try this at home as soon as I can get my hands on the Helios. PD said they'll contact me soon.

 

[Δημητρης Α]

Απάντηση: Kroma, LED απο την projectiondesign

απ'αυτα που διαβαζω,πρεπει να βαλουν ενα φτηνο φακο και να κοψουν ενα μηδενικο για ναχει καποιο ενδιαφερον το μηχανημα......:126:
δυστυχως απ'οτι φαινεται τα LED εχουν πολυ δρομο ακομα...........