|
|||||||||
|
Thread Tools | Search this Thread |
June 28th, 2008, 10:49 PM | #211 |
Inner Circle
Join Date: Dec 2004
Location: Arlington, TX
Posts: 2,231
|
All I can say is Wow.
|
June 29th, 2008, 11:14 AM | #212 |
Trustee
Join Date: Feb 2006
Location: USA
Posts: 1,684
|
Bob,
How happy are you with the 486 filters on your EX-1's. Do you have problems with green vignetting when wide and di you keep them on all the time? Lenny Levy |
July 1st, 2008, 06:21 AM | #213 |
Regular Crew
Join Date: Jan 2008
Location: New York, NY
Posts: 188
|
I've been using a 486 behind a Letus for several weeks now, and have not noticed any problems. Without the Letus and below 12mm or so I see a faint green/cyan cast on the edges. This is not always visible, but high key flat surfaces will definitely show it (white walls for example). It can be pulled out with a secondary adjustment in Color, however I'd rather not have to go through that step, and it changes size and shape so it will not always be the same each time otherwise a shading adjustment could resolve it.
Tim, if you call back ask for Lou. I've spoken to him twice about this subject and referred him to this thread. He has heard of a few cases of it, and seems to be concerned with getting it resolved. -Sean |
July 1st, 2008, 06:27 AM | #214 |
Inner Circle
Join Date: Aug 2006
Location: Poland
Posts: 4,086
|
Yes, I can confirm that using the 486 between the Letus achromat and the EX1 lens doesn't pose any additional problems than using it as the outermost optical element (at least, I personally don't see anything apart from the same green tint; in fact it tends to happen less often with Letus as you don''t use the widest angle).
__________________
Sony PXW-FS7 | DaVinci Resolve Studio; Magix Vegas Pro; i7-5960X CPU; 64 GB RAM; 2x GTX 1080 8GB GPU; Decklink 4K Extreme 12G; 4x 3TB WD Black in RAID 0; 1TB M.2 NVMe cache drive |
July 3rd, 2008, 03:46 PM | #215 | |
Sponsor: Schneider Optics
Join Date: Aug 2007
Location: Van Nuys, CA
Posts: 387
|
Quote:
There are two factors at play here in adding to everyone's confusion. One, the original post I made regarding the 486 vs 489 filters information is all true but based on information that I had at the time. The 486 is better for telephoto applications and normal angles (ie, 50mm in 35mm sensor size). The 489 is better for applications closer to the sensor but will still add a green cast if wide angle lenses are used. This is due to the reflective properties of the 486. Two, I have failed to explain how this technology works. 486 and 489 filters are designed to cut off IR light at 680 nanometers. This is in the near-visible IR spectrum and therefore sometimes visible to the camera's sensor. When you cut off IR light this low in the spectrum, the angle of view that will not cause color issues is significantly reduced. Our new True-Cut IR 750 cuts off the light at 750 nanometers. This is still on the edge of near-visible IR light; the outer edge. We have discovered that this will work at the widest angles possible while still maintaining the IR cutting properties required. This is information that has come to me recently. Therefore, the 486 and 489 filters were the only solution we had to work with by adapting older photographic technology to video. We have since recognized these short comings for video applications and produced the True-Cut IR 750 filter. Most video application should use the True-Cut IR 750 filter on the outside optical element. Use of this filter internally can create internal lens reflections resulting in flair and CA. The 489 is the only workable solution for this scenario but limits you to narrower angle of view. Ryan Avery Schneider Optics |
|
July 3rd, 2008, 08:04 PM | #216 |
Regular Crew
Join Date: Nov 2004
Posts: 1,414
|
Ryan, Can you post a part number for the ir750 filter...
I couldn't find it on your site... |
July 3rd, 2008, 09:26 PM | #217 |
Trustee
Join Date: Feb 2006
Location: USA
Posts: 1,684
|
Ryan , what I'm confused about still is whether the 489 adds an overall green tinge (which I could probably filter out) , or whether it is like the 486 in only adding the green around the edges which is a big big problem.
How much is the True-Cut IR 750, and where can we get it? Lenny Levy |
July 10th, 2008, 08:52 AM | #218 | |
Sponsor: Schneider Optics
Join Date: Aug 2007
Location: Van Nuys, CA
Posts: 387
|
Quote:
68-121044 4" x 4" True-Cut IR Filter $295.00 68-121056 4" x 5.65" True-Cut IR Filter $395.00 68-121057 5.65" x 5.65" True-Cut IR Filter $550.00 68-121059 5" x 5" True-Cut IR Filter $550.00 68-121066 6" x 6" True-Cut IR Filter $595.00 68-121077 77mm True-Cut IR Filter $250.00 All prices are list prices in USD. Check with a dvinfo sponsor for discounts. Ryan Avery Schneider Optics |
|
July 10th, 2008, 08:56 AM | #219 | |
Sponsor: Schneider Optics
Join Date: Aug 2007
Location: Van Nuys, CA
Posts: 387
|
Quote:
You can use the 489 and 486 filters but as we have seen through extensive back and forth conversation, these filters are best for industrial and photographic applications and should be used only as a last resort for video applications. I suggest you use the True-Cut IR 750 and find a way to attach it to the front of your camera. Ryan Avery Schneider Optics Last edited by Ryan Avery; July 10th, 2008 at 08:57 AM. Reason: Spelling |
|
July 10th, 2008, 09:00 AM | #220 | |
Inner Circle
Join Date: Aug 2006
Location: Poland
Posts: 4,086
|
Quote:
Cuase you see, I don't feel like spending any more cash on a 4th B+W filter in a row...
__________________
Sony PXW-FS7 | DaVinci Resolve Studio; Magix Vegas Pro; i7-5960X CPU; 64 GB RAM; 2x GTX 1080 8GB GPU; Decklink 4K Extreme 12G; 4x 3TB WD Black in RAID 0; 1TB M.2 NVMe cache drive |
|
July 10th, 2008, 10:58 AM | #221 |
Trustee
Join Date: Feb 2006
Location: USA
Posts: 1,684
|
With all respect to Ryan who has been trying to help us a great deal on this forum, I am finally beginning to suspect perhaps Schneider doesn't want its representative to say anything that could be construed as negative about its filters. I don't quite get it, but perhaps this is a typical business policy - certainly we haven't seen Sony making any announcements about back focus problems or even vignetting except very indirectly. They'll fix it but they haven't announced any recalls.
I think we've been hoping to get a clear statement from Ryan somewhat like : If you use the 486 on an Ex-1 you will get green vignetting under "x" circumstances, other possible issues are x y and z. If you use the 489 etc. and now of course - "if you use the True-Cut IR 750 you will or will not get green on this or that circumstance. That's all i want to know - exactly what it will do on an EX-1 and if there are any other issues we should know about ( i.e. stacking with other filters, compatability with say a pola, or daylight vs. tungstun, any color casts etc. I am far less interested in knowing why it was developed. So let me try this again. --Is it true that there may be some green vignetting on an Ex-1 with both 486 and a 489 at wide angles and that there will not be any green vignetting or other color problems with the True Cut 750? --Also Is it OK to stack the Tru Cut 750 within other filters? -- Any other issues we should know about with the True Cut. ? Will a 77mm fit inside the EX hood? (that's a tough one). ---Is the coating any more subject to abrasion? ---Can you use this as a general protection filter all the time in your shooting? Thanks, Lenny Levy |
July 10th, 2008, 11:13 AM | #222 | |
Inner Circle
Join Date: Aug 2006
Location: Poland
Posts: 4,086
|
Quote:
---What is the Tru Cut 750 real light transparency coefficient (as compared to the 486's 1.0 and the 489's 1.2)
__________________
Sony PXW-FS7 | DaVinci Resolve Studio; Magix Vegas Pro; i7-5960X CPU; 64 GB RAM; 2x GTX 1080 8GB GPU; Decklink 4K Extreme 12G; 4x 3TB WD Black in RAID 0; 1TB M.2 NVMe cache drive |
|
July 10th, 2008, 02:00 PM | #223 |
Sponsor: Schneider Optics
Join Date: Aug 2007
Location: Van Nuys, CA
Posts: 387
|
|
July 10th, 2008, 02:10 PM | #224 | |
Sponsor: Schneider Optics
Join Date: Aug 2007
Location: Van Nuys, CA
Posts: 387
|
Quote:
2) Yes you can stack the True-Cut IR 750 with other filters but it must be the first filter the light hits. Ie, front of the mattebox. 3) Yes our 77mm True-Cut IR 750 filter will fit inside the hood. I tested it on 4 different EX1 cameras. No other issues that I am aware of or have not been beaten to death in this forum. :) 4) Yes the coating is more subject to abrasion 5) Yes you can use it as a general protection filter but be aware that you are more likely to scratch it than one of our MRC coated filters. However, I have a sample I have carried around in my bag to various sets and I have yet to scratch it after many cleanings and knocking around. Not a guarantee but my personal experience. Ask a direct question; get a direct response. Ryan Avery Schneider Optics |
|
July 10th, 2008, 06:15 PM | #225 |
Trustee
Join Date: Feb 2006
Location: USA
Posts: 1,684
|
Thanks Ryan,
That settles it all clearly for me , Sorry I was dense before. I appreciate your hanging in there. Sounds like something we should all have for the Ex-1 Lenny |
| ||||||
|
Thread Tools | Search this Thread |
|