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benareeno
Joined: 22 Mar 2006
Posts: 1614
Location: ottawa, canada
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| Posted: Fri Dec 18, 2009 7:04 am Post subject: is a c-element a c-element? |
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Would a green c-element from a G70 work in say...an Ampro or Barco and 8 or 9" tubes? Are they all the same c-elements?
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Fri Dec 18, 2009 7:59 am Post subject: |
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No, they are different sizes.
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benareeno
Joined: 22 Mar 2006
Posts: 1614
Location: ottawa, canada
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| Posted: Fri Dec 18, 2009 8:20 am Post subject: |
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ok, but an 8" is an 8" no matter the brand or model of projector?
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Fri Dec 18, 2009 8:56 am Post subject: |
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3M HD-10 c elements are only made for the HD-10 family of lenses as far as I know......
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Fri Dec 18, 2009 10:22 am Post subject: |
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| benareeno wrote: | | ok, but an 8" is an 8" no matter the brand or model of projector? |
The HD-18 and HD-34 C elements are the same.
But the HD214/215/etc used in Barco Retros is different. About the same diameter, but different curvature.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri Dec 18, 2009 2:55 pm Post subject: |
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Also, Barco with their really old TAC lenses (9" ES focusing) used different curvature as well. I put one of those onto a 9" EM focusing set once, and it took 1/2 hour for me to figure out why the edges were not in focus.
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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Fri Dec 25, 2009 3:52 am Post subject: |
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AmPro's 9" C element "prescription" is not the same as on the C elements used on Marquees, and presumably, Barcos as well.
I know...I tried. No way could I make the Ampro C element-equipped Marquee tube assembly focus on both the edges and center. It
was one or the other but nowhere near both at once.
CJ
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papalek
Joined: 08 Mar 2006
Posts: 1536
Location: Longs SC
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| Posted: Fri Dec 25, 2009 3:04 pm Post subject: |
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| cmjohnson wrote: | AmPro's 9" C element "prescription" is not the same as on the C elements used on Marquees, and presumably, Barcos as well.
I know...I tried. No way could I make the Ampro C element-equipped Marquee tube assembly focus on both the edges and center. It
was one or the other but nowhere near both at once.
CJ |
You must of had some other problem. I have a red C element that was part of the group buy. It is in my Ampro 4600 with no problems and I know others have them in Barco's and Marquee's. I also am using a green C element that came out of a Barco 1209 in it. I have no issues with focus as you describe.
The C elements are made to mate to lens types,not model specific. All HD 10 series lenses use the same C elements. The only difference that I ever heard was between the shades of green between the Marquee and sony's.
_________________
My current list of PJ's AmPro 1 1/2-4600,4200, 1/2-3600,2600.
I do love my AmPro's
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Fri Dec 25, 2009 5:20 pm Post subject: |
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| papalek wrote: |
The C elements are made to mate to lens types,not model specific. All HD 10 series lenses use the same C elements. The only difference that I ever heard was between the shades of green between the Marquee and sony's. |
You are absolutely and exactly correct.
"C" elements are the first lens element, hence the designation "liquid coupled", or "optically coupled".
Anyone who asserts differently is mistaken, in the example proffered, they were likely trying to focus a lens at a size/distance that lens was not intended for, as the description of the problem is exactly what one would expect when trying to use a certain lens outside of its intended range.
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