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Z2 Iris .. Useless or Useful?

Discussion in 'Projectors, Screens & Video Processors' started by KraGorn, Dec 9, 2003.

  1. KraGorn

    KraGorn
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    One of the features of the Z2 is supposed to be the Iris to help improve contrast .. on my Draper Onyx 1.2 gain fixed-frame it utterly kills the image, it becomes dull, lifeless and muddy.

    The improvement in black is noticeable but not exactly stunning and the loss of vitality makes it useless to my eyes.

    I tried re-calibrating with the iris closed using Avia and to my surprise I ended up with nigh-on the same settings for Brightness and Contrast as I did with the iris open.

    I'm bemused as to why Sanyo bothered. Is my screen not up to making it useful, do you need a higher gain to make it worthwhile? :confused:
     
  2. Kramer

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    That's what I said in the Z2 vs HS20 thread.

    :smoke:
     
  3. WeirdFish

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    I found it useful, but only to cut the brightness down as with it open the image is a little too intense.
     
  4. KraGorn

    KraGorn
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    Indeed, just spotted your comment there.

    Actually I think I agree with Weirdfish, I think it could be useful to knockdown the image brightness a tad, rather than thinking of it as a black-level enhancer.
     
  5. nunew33

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    I thought one of the purposes of the iris is that it increases the depth of field, the distance where the image remains in focus.

    This would be useful if your screen was at a slight angle.
     
  6. GrahamC

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    I'd have thought that anything that adds to the ajustability of a PJ was a good thing. I to have use it to ajust the brightness a little.
     
  7. ROne

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    As I said before, if you have a light controlled room - ie no light, you can benefit from shutting down the amount of light to improve black-level.

    You will still have a perceived decent white level.

    It's not useless, it just doesn't suit set-ups where you need all the light!
     
  8. Off The Fence

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    I agree with ROne

    I run with the iris closed when I watch movies at night.

    Lower black level but still plenty bright....which is nice :)

    Cheers
     
  9. Goof

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    Couldn't they have added an 'eco eco' mode to save lamp hours even more, if essentially all it's doing is lowering lumen output? :D
     
  10. inzaman

    inzaman
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    I tried exactly the same thing last night with Avia, i had gone through the settings etc with the iris open, once i had done avia i then realised so went back to calibrate with the irsis shut and didnt have to change any settings :confused: It does help with the blacks when the room is totally dark, but all i really use it for now is shut when watching movies and open when playing the xbox as for some reason the xbox has a darker image than my dvd player.
     
  11. Quatermass

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    I like it. Nice to have something to tweak that doesn't involve navigating menus!
     
  12. Woz!

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    It's not just doing that.
    As mentioned above (and keen photographers will know this) it increases the depth of focus of an image if you have a lower F-stop value set. So - if you close the iris, the focus of the lens doesn't have to be so precise to give a percieved sharp image.
    This could help with sloping or uneven screens.
    Obviously it also cuts down on the light emitted, but this will cut down all light evenly, so I don't really understand how it's supposed to increase contrast except that there will be less light bouncing off your walls....
     
  13. KraGorn

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    :rotfl:
     
  14. buns

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    id be fairly confident saying that means something is badly calibrated in your chain......

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  15. Kramer

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    I used the Z2 in practically total blackout conditions & it was unwatchable IMO with the iris fully closed.

    It's not an "ultra" bright PJ to begin with either - hence, IMO, it's totally useless, at least through much of its range.

    :cool:
     
  16. Phil White

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    But as previously mentioned above the Iris Adjustability is referred to in Sanyo's bumph in relation to increasing depth of field. They even show a diagram explaining this with the example of a curved screen. Very useful if you set up an IMEX in yer front room!
     
  17. Kramer

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    How many owners will have curved screens or not have the screen perpendicular to the PJ?

    Not many I'll bet :)
     
  18. inzaman

    inzaman
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    Buns, thats what i was thinking do you think that i am best to calibrate my pj and xbox via avia, then adjust my dvd to come into line with them. The reason i say this is that i cannot finely tune or adjust the xbox but i can go into the dvd menu settings and adjust contrast, brightness hue etc through that. They both run via component through my amp and into my pj so are both using the same pj input.
     
  19. nunew33

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    People who have it on a coffee table at the max 11degree angle will benefit from the increased depth of field.

    I agree it may not be useful for most users but for those who will use it as a portable device it will give greater flexibility.
     
  20. jGrahamD

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    When I tried the Z2 out on a smaller screen, it was better with the iris closed.
     
  21. KraGorn

    KraGorn
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    That's a good point, I have a 92" so maybe the brightness loss is more noticeable the bigger the screen.
     
  22. buns

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    well the iris certainly does little or nothing for contrast...... i have it measured and open and closed, it is the same. What is does do is dramatically cut down the light.....like by 30% easily.

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  23. ROne

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    But aren't you lowering black level, which will give better spread of intensitys at the dark end.

    I wouldn't imagine the real contrast ratio will improve because the white level is coming down by the same amount.
     
  24. buns

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    im also thinking the autograyscale may be a useful thing...... i got one really high contrast using it...... up beyond 900:1

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  25. KraGorn

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    I agree Kramer, IMO anything more than maybe 20% of it's fully opened loses a lot of shadow detail and dulls the picture badly ... maybe it's intended for use with 1.3 or greater gain screen? :confused:
     
  26. Quatermass

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    Good because I have mine turned on! Are other Z2er's using this feature?
     
  27. buns

    buns
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    does the auto grey cause the fan to modulate?

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  28. Quatermass

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    You mean go through more short cycles of operating - well I haven't noticed it doing that but, of course, you can only really hear the fan in quiet parts. Have to try and take a bit more notice of what it is up to.
     
  29. KraGorn

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    I've left auto-greyscale off, I'm sure I read somewhere this was only useful in certain circumstances that at the time of reading didn't seem to apply .. does it allow this to be set using the DVI-D input?
     
  30. WeirdFish

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    The auto wot? :blush:
     

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