Open Telecine: Aperture

The remain physical components to be build for the Open Telecine are: aperture, lighting, optics (adjust wheel and cone), body, and film guide wheels. The part that was manufactured in this blog was the aperture. The images show the final aperture in pieces and assembled.

According to Wikipedia, "In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture of an optical system is the opening that determines the cone angle of a bundle of rays that come to a focus in the image plane. The aperture determines how collimated the admitted rays are, which is of great importance for the appearance at the image plane. If an aperture is narrow, then highly collimated rays are admitted, resulting in a sharp focus at the image plane. If an aperture is wide, then uncollimated rays are admitted, resulting in a sharp focus only for rays with a certain focal length. This means that a wide aperture results in an image that is sharp around what the lens is focusing on and blurred otherwise. The aperture also determines how many of the incoming rays are actually admitted and thus how much light reaches the image plane (the narrower the aperture, the darker the image for a given exposure time)."

The 8mm aperture was build in a small body that will compress the film between two planes: a fixed plane and a leaf spring. This allows the film to slide through with kinks and bumps (e.g. between the feeder film and film). The plastic grain is extruded to align parallel with the film, thus making a smoother contact surface. The current aperture is 8mm x 8mm, making it project the entire surface of the film. This include the sprocket holes and edges. The hopes are that the sprocket holes will help in detecting the film speed and frame position when using image processing (e.g. Canny edge detection).

Open Telecine and Mounts

The following parts have been created using OpenSCAD: motor mount, freewheel, freewheel mount, 100mm shaft, extended motor connector /w clip, and extended motor connector w/ thread.

The photo of the desktop shows the motor mount being build by using a 2D outline in LibreCAD, then extruding into 3D with OpenSCAD, and finishing additional customization using constructive solid geometry (http://en.wikipedia.org/wiki/Constructive_solid_geometry).

A flanged bushing was used for the freewheel and mount. The hopes are that this bushings will provide a small amount of friction, and keep the film tight. Second, it might serve as a way to eliminate the motor on the reel with film (i.e. not the uptake reel). The rewind function can still be achieved by swapping the two reels. The trade-off become lower cost and more work versus higher cost and less work.



This part was created by using only open source hardware and software: Ubuntu (similar to Microsoft Windows and MacOS), gimp (similar to Adobe Photoshop), ReplicatorG, LibreCAD and OpenSCAD (simular to AutoCAD), and MakerBot.

Open Telecine and 8mm Film Spool

I assume, that in most cases, film will already be stored on a spool. However, not everyone using Open Telecine will have an uptake reel or extra reel. For those users who are short on a reel, an open source reel was developed.

As seen in the first photo, the reel is split into two halves, each with 6 segments. The segments are connected together using a dovetail joint, with 1.5mm protruding and recessed divots to lock them together.



Each half of the film is locked together (again with divots) using concentric cylinders, with the outer most cylinder holding the initial wrap of film. There is also a small gap in outer most reel to allow for an initial film lock.

The last photo, from OpenSCAD, shows an updated version that has holes to indicate the amount of film a reel contains, starting at 25m and ending in 150m. Thus, this 8mm film reel can hold approximation 150 meters of film. By experimentation, it appears that film lenght (L in m) is functionally determined by radius of film (R in m) and radius of spool wheel (S in m), L = (6500*PI*R*R)-(6500*PI*S*S). Thus, for our S=0.03 reel, R = SQRT(L+6500*PI*0.03*0.03)/(10*SQRT(65*pi)). No additional experimentation was performed on the final reel to determine accuracy. This will be conducted for when the electronics is connected, to allow the motor to do its job in reeling up the film.

Since the Open Telecine film reel differs in thickness from a commercial reel, the motor reel connectors will also need to be updated.



This part was created by using only open source hardware and software: Ubuntu (similar to Microsoft Windows and MacOS), gimp (similar to Adobe Photoshop), blender (similar to Autodesk Maya), ReplicatorG, LibreCAD and OpenSCAD (simular to AutoCAD), and MakerBot.

Open Telecine and 8mm Film spool Connectors

One of the ways to step through a sequence of frames in a film, is to connect the 8mm film spool to a stepper motor. The problem solved in this blog is the structural support material needed to convert a 5mm motor shaft to the slotted 8mm film spool.



The first approach used was to design 3D drawing of the spool connector in blender (blender.org), then use a MakerBot (makerbot.com) to fabricate the part. In the first photo (left to right), blender was used until an attempt was made to add threads to the top of the connector shaft. This was necessary in order to secure the film spool to the connector shaft with a nut. However, even though this problem can be solved in blender, I come to the realization that a computer-aided design (CAD) program would be more appropriate.

Starting on the 6th spool connector (first photo left-to-right), LibreCAD (librecad.org) and OpenSCAD (openscad.org) was used. To re-accomplish the same work from blender, it took 5 minutes to complete a 2D draft in LibreCAD, and 20 minutes in OpenSCAD. Each additional draft in OpenSCAD was exported to an .stl file (STL files describe only the surface geometry of a three dimensional object). ReplicatorG 0025 (replicat.org) was then used to convert each draft to g-code. G-code is the common name for the most widely used computer numerical control (CNC) programming language, and in my case, the MakerBot.

The second and third photographs show the completed product. Two spool connectors were generated: one with a threaded shaft and nut (secure but take longer), and the other with a notched shaft and clip (faster but less secure).





This part was created by using only open source hardware and software: Ubuntu (similar to Microsoft Windows and MacOS), gimp (similar to Adobe Photoshop), blender (similar to Autodesk Maya), ReplicatorG, LibreCAD and OpenSCAD (simular to AutoCAD), and MakerBot.

The Doctrines Of Christ

A Note from the Author: Since Almighty God, the Lord Jesus Christ, gives His Salvation and His Word to all freely (Rev 22:17, Mt 10:7-8), this book, and all other books, written by Harry A. Peyton are given without charge, and can be accessed through the Internet at the following address: http://www.DoctrinesOfChrist.com. Therefore, fell free to copy it in digital or written form, and share it with others. Since this book is copyrighted, the author forbids any alteration of its contents, and the reproduction of it in any form for Marketing Purposes. This book may be placed on anyone’s web page, as long as my website address is attached to it.

The author believes that the Word of God is infallible in the ORIGINAL LANGUAGE it was written in, and all translations of the Bible regardless of how good they may be are NOT. Since the author has implicit faith in the infallibility of the Word of God, the author has formed his beliefs firmly on the truth of the Bible. This author uses the ancient ANTIOCHIAN LITERAL-HISTORICAL METHOD OF INTERPRETING THE BIBLE, which was used by early Christian Prophets and Apostles of the Bible.

I definitely believe that the ancient Alexandrian Allegorical Method of spiritualizing scripture, which was made popular by the ancient Jewish philosopher Philo Judaeus (13 BC – 50 AD) and later used by the Ante-Nicene Catholic Priests, especially Origen and his student Clement of Alexandria (200 AD), is an abomination to our Lord. Therefore, all scriptures will be interpreted in a literal exegetical fashion, unless the language used and the context demands a spiritual interpretation.

All CAPITALIZATION and ITALICIZATION in QUOTES used in this book is always MINE. All Biblical quotes used in this book will be in dark red, and from the New King James version of the Bible, unless another version is stated as the reference. The vast majority of all translations of the Bible, as well as Hebrew and Greek Lexical definitions and grammar, will come from BibleWorks computer software program version 7.0. The author in most places will quote verses from the Bible instead of commenting on a verse and giving a reference; for He believes that the written Word of God’s has greater power to inspire and enlighten a heart to understand and act upon truth, than the elegant oratory or writings of any man.

If this book has been a blessing to my beloved readers, and they would like to send an offering to the author, feel free to do so. If anyone wishes to send any biblical or historical materials to the author, my address is: 148 Little Creek Hills Rd.: Alto, NM 88312: Phone # 575-336-2800: Email address: DoctrineOfChrist@Hotmail.com.

A CHALLENGE FOR A BIBLICAL PUBLIC DEBATE

Retired Pastor, Evangelist, and Author Harry A. Peyton challenges any Pastor to an honorable formal Public Debate on the Biblical New Birth. This minister believes that the only way anyone, Christian or non-Christian, can receive Eternal Life is by entering into the death, burial, and resurrection of our God and Savior, the Lord Jesus Christ. This can ONLY be done by being baptized into the sin cleansing Name of the Lord Jesus Christ, and by receiving the Holy Spirit with the initial Biblical evidence of speaking in tongues as the Spirit of God gives them the words to speak in a known language not learned by them (Jn. 3:3-8; Tit. 3:5-7; Acts 2:1-4, 36-40; 10:44-48; 19:1-5; 1Co 6:11; Mk 16:15-17; 1Pe 3:20-21).

Because I sincerely LOVE Pastors and Christians from all denominations, and do not want to see them lost and go to the Lake of Fire, I make this challenge. Jesus commanded All Believers to: “Enter by the narrow gate; for the gate is wide, and the way is broad that leads to destruction, and MANY are those who enter by it. For the gate is small, and the way is narrow that leads to Life, and FEW are those who find it.” In the next verse, Jesus told Believers in Christ why MANY of them will not received Eternal Life: “Beware of the False Prophets, who come to you in sheep's clothing, but inwardly are ravenous wolves” (Mt. 7:13-15, NAS)

Therefore, MANY Deceived Christians will wake up in the Resurrection and discover have been Deceived by False Prophets concerning the Foundational Doctrine of the New Birth. Jesus said: “Not everyone who says to Me, ‘Lord, Lord,’ will Enter the Kingdom of Heaven; but he who does the Will of My Father…. MANY will say to Me on that Day [i.e. Day of Judgment], ‘Lord, Lord, did we not prophesy in Your Name, and in Your Name cast out demons, and in Your Name perform many miracles?’ And then I will declare to them, ‘I NEVER [Greek – oudepote – NEVER AT ANY TIME] Knew you” (Mt. 7:21-23, NAS). Jesus then told them why He NEVER Knew them or why they were NOT His Children, He says they built their Spiritual House on a Wrong Foundation (Mt. 7:24-27, NAS). In other words, False Prophets told them to believe ON Christ INSTEAD of Believing INTO Jesus’ Death, Burial, and Resurrection through the New Birth of “Water and Spirit”! Therefore, they did NOT do God’s WILL by “Entering into the Straight and Narrow Gate to Eternal Life, which is the New Birth”.

This retired Pastor is ready to defend his belief system just as the great apostle Paul did in the Book of Acts against heretics (Acts 17:16-17; 9:29; 15:1-7; 2Ti. 4:1-5). If any Pastor wishes to accept this challenge, call Harry A. Peyton at 575-336-2800 to establish a time, place, and rules for debate. This minister of Christ is not a novice for he has held various Church Offices: Pastor, Assistant Pastor, and Evangelist. He has earned a BA in Theology and has written 26 books on the Doctrines of the Bible, which he gives away on his website, for he believes God’s truths are not for sale. Read or Download my 225 page book: Preacher, What Must I Do to Receive Eternal Life at: www.doctrinesofchrist.com.