Πρόβλημα focus και διαστολών-συστολών σε νέους προβολείς!
- Thread starter Strax
- Start date
geodengr
AVClub Addicted Member
Παρακολουθώ με πολύ ενδιαφέρον το θέμα γιατί νομίζω είναι αρκούντως σοβαρό. Εγώ πάντως δεν μπορώ να εκφέρω γνώμη, επειδή ο προβολέας δεν μπορεί (πρός το παρόν τουλάχιστον) να είναι σε σταθερή θέση απέναντι στην οθόνη. Μόλις όμως γίνει αυτό, θα το ψάξω με προσοχή.
Φιλικά
Γιώργος.
Φιλικά
Γιώργος.
- 19 June 2006
- 190
Η τελευταία ενημέρωση από το projectorcentral:
"Friday, January 23
Hi folks,
In case you have not been tuning in lately, we've been trying to resolve an issue with the Epson 6500UB and 6100 before proceeding with the reviews. The issue is that they tend to fall out of focus during the first half hour of a viewing session, if they have been started up at room temperature. Epson maintains that this may occur during an initial break-in period, but that they will stabilize with time. We have been putting our test units through a series of power up and power down cycles, and putting some hours on them to see if the defocusing issue is resolved with normal use.
What we can say so far is this. First, there seems to be a variance in the degree to which any given unit is susceptible to defocusing. The first of the two 6500UB's we received showed the most severe defocusing. If you focused it upon start up, after about 30 minutes it was obviously blurry. The second 6500UB does the same thing, but it does not defocus to the same degree the first one did. We have also received a 6100, and that unit shows the same tendency to defocus as the two 6500's. The severity of the issue on the 6100 falls about half way between the first and the second 6500UBs...not as bad as the first one, but it loses more focus than our newer 6500UB.
We are puzzled as to why there is a noticeable difference in the degree to which defocusing occurs on these three units. We have asked Epson whether there are any physical differences that could account for it, but have not yet received a response. If there is nothing different in the design, perhaps these differences are simply due to manufacturing variances.
At this point we have 65 hours on the 6500UB, and about 30 hours on the 6100. So far we are not seeing any significant mitigation of the problem. However, it is possible that we will see improvement as we accumulate more hours on the projectors. We will continue to run these units to see how they may settle in.
As we've been exploring this, we wondered whether other projectors might be susceptible to the same problem, and perhaps we just had not noticed it before. So we went back to retest several 1080p projectors we have on hand, including the BenQ W20000, the Panasonic AE3000, the Sanyo Z3000, and the Mitsubishi HC6500. We were happy to see that the BenQ 20000, the Panny AE3000 and the Mits HC6500 all remained in perfect focus after one hour's runtime. The Sanyo Z3000 had shifted just a hair from perfect after one hour, but you'd need a microscope to measure the difference. The tiny shift would never been noticed by anyone, and it is not enough to have any impact on the Z3000's picture quality or sharpness. So the bottom line is that none of these four projectors have any tendency to defocus in the manner we are seeing on the Epson models.
If you have any personal experience as an owner of any of the new Epson home theater models--either good or bad--I'd like to hear from you. Please drop me a note here to give me your input.
Stay tuned....we will report more as we learn more. This is an interesting mystery.
Thanks for using ProjectorCentral,
Evan Powell
Editor"
"Friday, January 23
Hi folks,
In case you have not been tuning in lately, we've been trying to resolve an issue with the Epson 6500UB and 6100 before proceeding with the reviews. The issue is that they tend to fall out of focus during the first half hour of a viewing session, if they have been started up at room temperature. Epson maintains that this may occur during an initial break-in period, but that they will stabilize with time. We have been putting our test units through a series of power up and power down cycles, and putting some hours on them to see if the defocusing issue is resolved with normal use.
What we can say so far is this. First, there seems to be a variance in the degree to which any given unit is susceptible to defocusing. The first of the two 6500UB's we received showed the most severe defocusing. If you focused it upon start up, after about 30 minutes it was obviously blurry. The second 6500UB does the same thing, but it does not defocus to the same degree the first one did. We have also received a 6100, and that unit shows the same tendency to defocus as the two 6500's. The severity of the issue on the 6100 falls about half way between the first and the second 6500UBs...not as bad as the first one, but it loses more focus than our newer 6500UB.
We are puzzled as to why there is a noticeable difference in the degree to which defocusing occurs on these three units. We have asked Epson whether there are any physical differences that could account for it, but have not yet received a response. If there is nothing different in the design, perhaps these differences are simply due to manufacturing variances.
At this point we have 65 hours on the 6500UB, and about 30 hours on the 6100. So far we are not seeing any significant mitigation of the problem. However, it is possible that we will see improvement as we accumulate more hours on the projectors. We will continue to run these units to see how they may settle in.
As we've been exploring this, we wondered whether other projectors might be susceptible to the same problem, and perhaps we just had not noticed it before. So we went back to retest several 1080p projectors we have on hand, including the BenQ W20000, the Panasonic AE3000, the Sanyo Z3000, and the Mitsubishi HC6500. We were happy to see that the BenQ 20000, the Panny AE3000 and the Mits HC6500 all remained in perfect focus after one hour's runtime. The Sanyo Z3000 had shifted just a hair from perfect after one hour, but you'd need a microscope to measure the difference. The tiny shift would never been noticed by anyone, and it is not enough to have any impact on the Z3000's picture quality or sharpness. So the bottom line is that none of these four projectors have any tendency to defocus in the manner we are seeing on the Epson models.
If you have any personal experience as an owner of any of the new Epson home theater models--either good or bad--I'd like to hear from you. Please drop me a note here to give me your input.
Stay tuned....we will report more as we learn more. This is an interesting mystery.
Thanks for using ProjectorCentral,
Evan Powell
Editor"
Μιχάλης Πικούνης
Established Member
- 18 June 2006
- 285
Παντως οπως ειπα και στο αρχικο thread, ο 10αρης στο δικο μου setup αν ρυθμιστει σωστα στο focus του, το φαινομενο αυτο δεν τον επηρεαζει τοσο πολυ. Αν δεν ξερεις πως συμπεριφερεται ο προβολεας οταν ζεσταθει και απλα κανεις focus τοτε υπαρχει μεγαλη περιπτωση στην ωρα να εισαι εντελως εκτος focus.
- 19 June 2006
- 190
Υπάρχει νέα ενημέρωση από το projectorcentral. Με λίγα λόγια, φαίνεται ότι πρόκειται για πρόβλημα ψύξης και διορθώνεται κάπως με τη λειτουργία του ανεμιστήρα για χρήση σε μεγάλα υψόμετρα. Η Epson προχωράει επίσης στην μετατροπή της εξόδου ψύξης. Αναλυτικά:
"We are making progress in getting the focus issue on the new Epson models squared away. In our latest test, we decided to try running the 6500UB and the 6100 in high altitude mode (this mode makes the fan run faster to move more air through the projector). The result was that the tendency for both units to defocus over time was reduced somewhat. We still saw some defocusing on the 6500UB, but it was less than we'd been seeing before. The 6100 showed some improvement also. The 6100 is the more problematic of our test units, as it always goes more out of focus than the 6500UB. In this latest test in high altitude mode, the 6100 defocused less than it has been in the past, but still too much to be acceptable by our standards.
Epson believes that the issue will be resolved by further enhancing the airflow through the unit. As a result, they are making an alteration near the exhaust vent that will achieve this objective. New units being manufactured henceforth will have this enhancement. We expect to receive new test samples with this improvement around mid-February.
We are aware that not everyone is experiencing defocusing on these models to the same degree that we have been. Since the issue seems to be related to cooling and airflow, it is reasonable to suspect that elevation may be playing a role in the uneven results. We are in Las Vegas, and our projector testing is done at 3000 feet elevation. Due to the slightly thinner atmosphere it is possible the defocusing we are seeing may be more than what users might experience at sea level. Nevertheless, the competitive units we have been testing do not defocus to the same degree. So we are looking forward to receiving new test units with the updates.
projectorcentral"
"We are making progress in getting the focus issue on the new Epson models squared away. In our latest test, we decided to try running the 6500UB and the 6100 in high altitude mode (this mode makes the fan run faster to move more air through the projector). The result was that the tendency for both units to defocus over time was reduced somewhat. We still saw some defocusing on the 6500UB, but it was less than we'd been seeing before. The 6100 showed some improvement also. The 6100 is the more problematic of our test units, as it always goes more out of focus than the 6500UB. In this latest test in high altitude mode, the 6100 defocused less than it has been in the past, but still too much to be acceptable by our standards.
Epson believes that the issue will be resolved by further enhancing the airflow through the unit. As a result, they are making an alteration near the exhaust vent that will achieve this objective. New units being manufactured henceforth will have this enhancement. We expect to receive new test samples with this improvement around mid-February.
We are aware that not everyone is experiencing defocusing on these models to the same degree that we have been. Since the issue seems to be related to cooling and airflow, it is reasonable to suspect that elevation may be playing a role in the uneven results. We are in Las Vegas, and our projector testing is done at 3000 feet elevation. Due to the slightly thinner atmosphere it is possible the defocusing we are seeing may be more than what users might experience at sea level. Nevertheless, the competitive units we have been testing do not defocus to the same degree. So we are looking forward to receiving new test units with the updates.
projectorcentral"
Ultra-One
Senior Member
Το ίδιο πρόβλημα εντοπίσα και στον δικό μου Panasonic PT-AE2000, με τη διαφορά ότι αν τον εστιάσεις μια φορά όταν είναι ζεστός (μετά από καμιά ώρα) τότε είναι πάντα σωστά εστιασμένος όταν ζεσταθεί.
Μόλις τον ανάψεις η εστίαση είναι λίγο οφφ αλλά όταν περάσει ένα τέταρτο τότε είναι εστιασμένος σωστά.
Μόλις τον ανάψεις η εστίαση είναι λίγο οφφ αλλά όταν περάσει ένα τέταρτο τότε είναι εστιασμένος σωστά.