Във връзка с техническия проблем с кинокамерата ARRI 35 BL-2, "ARRI" ми изпрати следния отговор (дата на получаване: Понеделник, 2007, Октомври 22, 12:00:41 EEST), от който е видно, че (цитирам):
"... these kinds of image problems are not considered to be caused of the use of any camera stabilization systems such as Steadicam, cranes, dollies or handheld..."!
В превод: "... проблеми с изображението от такъв вид не се считат за причинени от използването на каквито и да са системи за стабилизация на камерата като Стедикам, кранове, фартови колички или работа с камера от ръка..."
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ЦЕЛИЯТ ТЕКСТ НА ОТГОВОРА ОТ "ARRI" ПУБЛИКУВАМ ПО-ДОЛУ, БЕЗ РЕДАКЦИИ ИЛИ СЪКРАЩЕНИЯ:
Dear Mr.Girginov,
Mr.Markus Kannewischer forwarded your mail regarding the ARRI 35 BL-2 camera to us.
Concerning your questions about the camera ARRI 35 BL-2, our technical crew is able to define clearly the described strobo-problem of the image as a certain artefact which seems to be associated mainly with some processes of wearing out of the pin and claw mechanism in the camera. Another possibility could be that the main drive belt in the camera body is very loose and brings the camera to a flicker by moving the one. Therefore, these kinds of image problems are not considered to be caused of the use of any camera stabilization systems such as Steadicam, cranes, dollies or handheld.
As the film is moving through the tract (film gate) and the camera is in motion (either in uniform or in irregular velocity) the register pin and claw mechanism may come out of synchronization in short but even continuation. Thus, the register pin positions the frames of the film innacurately. Apart from the possible mechanical defect of the movement (transportation cycle), the reasons for this can be also an innacurate, damaged or wrong film (positive) perforation, unsatisfactory raw film dimensions or also strong layer paragraph in the range of the film gate. Some other possible reason could also be the film loops - this may be an operating error, not surely a camera defect - the lower film loop is substantially too small so that the film is pulled away during the exposure from the lower tooth drum.
Errors in the movement and/or in the synchronisation with the rotary shutter become apparent already in the case of very small deviations from the target in the picture. The causes are also various. So rough transport of the camera or a fall can be responsible for the disadjustment.
We have noticed in the last years that not all of the film gates keep at the same precision and can cause the film channel not to be precise, in turn causing the film channel to become unparallel.
In general, the problem of unsteadiness in a 35 BL cameras (including BL-2) could be caused by several reasons:
1. Horizontal unsteadiness (horizontal problems) - unsteadiness movement in horizontal direction will show up in double exposure test. The reason - the film channel, e.g. after changing the film gate (not in the correct tolerance). Solution: with the Grange tool, the focal distance of the flange can be measured. The movement should be tightly held in the slide when tried to be moved.
If the problem is in the movement (the timing between the register pin and the pull down claw is incorrect), precise readjustment is needed.
2. Vertical unsteadiness problems - mostly caused by unadjusted magazines. If the problem is in the movement (wrong position of the magazine in the camera), readjustment of the magazine is needed (use only upgraded BL-2 magazines!) When the magazine is in the camera, then it has to touch the loop stoppers in the camera. The register pin must always correct the film on the same edge.
Other possible problem could be in the register pin bearings but only qualified staff should change the bearings if there is a free play in the side ways direction between the pin and the bearings.
If the problem is in the movement - the camera technician should check the distance between the pull-down claw edge and the register pin edge (see is the distance between the pull-down claw and the register pin is correct).
Mr.Girginov, with reference to be able to obtain the best possible image results with this particular camera BL-2, we strongly recommend that a thorough technical examination and adjustment should be undertaken immediatelly. For further investigation it is needed to have this ARRI 35 BL-2 camera here in Munich. Here we can check the camera complete mechanical and electronicalwise. Please let us know! We also advise and encourage you to consider the advantages of the modern range of the ARRI cameras.
Best regards,
Peter Geheb
Arnold & Richter Cine Technik GmbH & Co. Betriebs KG, M?nchen, Germany
Sitz: M?nchen - Registergericht: Amtsgericht M?nchen - Handelsregisternummer: HRA 57918
Pers?nlich haftender Gesellschafter: Arnold & Richter Cine Technik GmbH
Sitz: M?nchen - Registergericht: Amtsgericht M?nchen - Handelsregisternummer: HRB 54477
Gesch?ftsf?hrer: Prof. Dr. Dejan Ilic; Franz Kraus; Jens Sch?fer
Beiratsvorsitzender: Prof. Dr. Hans-J?rg Bullinger
CAMERA SERVICE DEPT.
Arnold & Richter Cine Technik GmbH
T?rkenstr. 89
D-80799 M?nchen
0049 (0) 89 - 3809-1016
Fax: 0049 (0) 89 - 3809-1793
http://www.arri.de