國外追焦器大評比Chrosziel ,Cinetech Titanium SL ,Indifocus,Petroff,Redrock Micro

tmtcman

國外原始評比網址

1.Chrosziel DV   售價1700美金   五星評比:四顆半
The Chrosziel DV Follow Focus is a lightweight unit with a polished and professional feel. It attaches to standard 15mm rods and locks tightly in place with one knob. That single knob also locks the horizontal slide adjustment, making setup and configuration a breeze. The horizontal slide action is smoothly dampened, which is a nice touch and surprisingly helpful as you mesh the follow focus gear with the lens. Metal edges are smoothly machined and the entire unit is built with tight tolerances on every moving part. We noted the gearbox is dampened as well, facilitating a smooth, noiseless focus pull.
Testing the unit with a millimeter marking scale, we found virtually no slop in the gears, measuring between 0.5mm and 1mm of play inherent in the gearbox. The 0.8/32 pitch focus gear can be quickly moved to the opposite side of the gearbox. Additionally, the standard gear can be replaced with optional pitch ratios for other lens types. The removable white marking ring has a unique flat upper face that also allows it to be read from the camera operator’s side. You can rotate the metal marking indicator all the way around the marking ring with a simple adjustment knob—another useful touch. The rubberized focus dial provides plenty of grip for complicated focus pulls. There is a standard accessory port for extension whips or a speed crank.
Overall, the Chrosziel DV follow focus is a reliable unit with a beautiful fit and finish that inspires confidence. Well suited for 35mm adapter configurations, it can handle both 35mm cinema and 35mm still camera lenses with ease. (Thanks to Chrosziel authorized reseller 16x9, Inc., for providing the demo unit used in this review.)
2.Cinetech Titanium SL  售價1750元美金   五星評比:三顆半

The Cinetech Titanium SL Universal Follow Focus is a lightweight unit with a unique, highly configurable design. It spans and attaches to a pair of standard 15mm rods, though we noted the locking mechanism only tightens down on a single rod. Despite this curious design, we found it stayed securely in place during our tests. There is no horizontal adjustment in the base of the unit, but the follow focus gear is mounted on a quick-release swing-away arm that allows the unit to be readjusted for a variety of lens barrel diameters. A replaceable rubber belt on this arm drives the focus gear, and provides some dampening of the gearbox action. Testing the unit with a millimeter marking scale, we noted some excess give in the gearbox and belt drive, measuring between 3mm and 3.5mm of play. The belt seemed to create some additional noise and vibration.
The 0.8/32 pitch focus gear can be used on either side of the swing arm, and quickly replaced with optional pitch ratios. A small articulated LED light illuminates your lens barrel or the unit’s removable white marking ring. A metal clip (that can be positioned anywhere on the marking ring) provides a hard stop for difficult focus pulls. The grooved focus dial is composed of a hard plastic, but you can also outfit your unit with a optional polished wood focus dial.
The Cinetech is unique in offering three standard ports for speed crank extension whip accessories. The first is located where you would expect it, on the face of the focus dial. Under the lens barrel you’ll find another port, for operation from the opposing side of the camera. Finally, a third port points directly back to the camera operator. This one works really well with Cinetech’s handle-mounted remote manual lens control, a very handy optional accessory.
The Cinetech Titanium SL follow focus unit is a solid, unique design that can be used in a number of useful configurations. It drove our 35mm adapter and PL lens without breaking a sweat. While we weren’t thrilled with the rubber belt drive design, the unit counters that by offering additional handy options and features that set it apart.

內容更新會在鮮師影像部落格

[ 本帖最後由 tmtcman 於 2008-2-4 14:45 編輯 ]

tmtcman

3.Indifocus  售價400元美金   五星評比:兩顆
The IndiFocus that we tested initially arrived equipped with a proprietary focus gear that only interfaces with IndiFocus lens gears. For standard 0.8/32 pitch lens gears you’ll need the $20 Cine-Pitch gear option, which is what we conducted our tests with.
The follow focus attaches to standard 15mm rods and locks in place with a single knob. A center knob underneath locks the horizontal slide. You can fully loosen that knob and quickly re-mount the follow focus on the opposing side of the camera without unlocking the base from the rods. Fit and finish is lacking somewhat; for example, the base that mounts to the rods is floppy when loosened. You tend to fumble around for a bit when first mounting the unit. There is also a vertical riser adjustment that, unfortunately, tends to flex forward and back under load. Exacerbating that issue is the fact that the face of the focus gear is very narrow. The end result is that the focus gear tends to pop off your lens gear if you happen to be using a lens with some forward travel in it. Flexing is nearly eliminated by dropping the unit to its lowest setting, which of course negates the usefulness of the vertical adjustment option.
We noted quite a bit of slop in the gearbox, measuring between 6.5mm and 7.5mm of play inherent in the unit. Gears can be replaced with other optional pitch ratios. This unit also exhibits the tendency to draw focus and lens gears towards each other as you lock the unit down. Leaving extra space between the gears as you mesh them solves this behavior.
The white marking ring is not removable, and the metal marking indicator is fixed in place. The focus dial is a grooved hard plastic design with a solid grip surface, and the face of the dial features a proprietary accessory port that only fits the IndiFocus whip. We noted that the extension whip does not lock into the port—instead, it uses a weak magnet to stay connected.
The IndiFocus whip, employing a spring-like design, tends to store up and then release tension as you focus, making repeatable movements difficult. Another issue we noted was the use of disparate fasteners throughout the design. For instance, the focus gear is attached using a metric Allen head screw, while the vertical riser uses an SAE standard Allen head. While it may seem that we’re picking at straws, non-uniform fasteners realistically means you’ll have extra tools to remember in the field.
In conclusion, the IndiFocus is a basic follow focus that performs acceptably in certain specific configurations, obviously considering the price point. However, there are a number of concerns we noted in use with our 35mm adapter system, and the design in general is not very robust. While it may well fit the needs of many shooters, we would not recommend the IndiFocus for use in a professional production environment.
4.Petroff Mini  售價900元美金  五星評比:四顆

The Petroff Mini is a solid and reliable performer. The unit attaches to standard 15mm rods and locks in place with a side-mounted knob that controls horizontal slide. The gearbox is not dampened, but gear action is noiseless and buttery smooth. Using our millimeter marking scale, we found that this unit measured between 1mm and 1.5mm of play inherent in the gearbox.
The standard 0.8/32 pitch focus gear can be mounted on the opposite side of the gearbox, and gears can quickly be replaced with optional pitch ratios. We noticed that when meshing the focus and lens gears the lock knob tended to pull the unit in towards the lens, binding it up and stressing the lens mount. Leaving a little extra space between the gears before we locked it down alleviated that concern. Another issue we noted was that the fixed marking ring is molded in one piece with the focus dial, and is a medium gray color. Black grease marks do not stand out on the gray, so you’ll need to use a white marker for this unit. The marker surface is a very useful design, slanted at an angle that can be easily read by both the focus puller and the camera operator. A rotating metal marking indicator can be positioned anywhere around the marking ring with a quick adjustment knob. The focus dial has a nubby rubberized texture that provides plenty of friction for hard pulls, and the face of the dial features a standard accessory port for extension whips or a speed crank.
Overall, the Petroff Mini offers good fit and finish, and is equally at home driving 35mm cinema PL and 35mm still lenses. A quick note: Petroff calls this unit the “Economy” model. For a few hundred dollars more, the company sells a similar unit that features a replaceable white marking ring. (Thanks to Petroff authorized reseller Ste-Man, Inc., for providing our review demo unit.)
5.Redrock Micro   售價650元美金   五星評比:四顆

Redrock Micro’s follow focus attaches to standard 15mm rods and locks in place with two side-mounted knobs. A center knob underneath locks horizontal slide. You can fully unscrew that knob and quickly mount the follow focus on the opposing side of the camera without unlocking the unit’s base from your rods. The gearbox is dampened, making focus pulls smooth and noiseless.
Testing the unit with a millimeter marking scale, we found very little slop in the gearbox, measuring between 1.5mm and 2mm of play inherent in the gears. The extra-wide 0.8/32 pitch focus gear is fixed to one side of the gearbox, which may be a concern during use with some unique rig configurations. Gears can be replaced with optional pitch ratios. The focus gear and lens gear tend to tighten towards each other as you lock the unit down—leaving extra space between the gears when you mesh them solves that issue. The removable white marking ring secures quickly and solidly in place with a magnet. The metal marking indicator is fixed and cannot be repositioned.
The focus dial features a metal surface with hundreds of machined grooves, offering plenty of grip for complicated pulls. The face of the dial features a standard accessory port for extension whips or a speed crank. Redrock includes three wide plastic lens gears in the basic follow focus bundle, each of which employs a simple toolless design that works well with a wide variety of 35mm still camera lenses.
We found the Redrock Micro follow focus to be a reliable performer and solidly constructed. As you would expect from a company that makes lens adapter systems, it handles cinema and still lenses on a 35mm adapter with ease. While it doesn’t offer as many features as some other units we’ve tested, the minimal amount of gear play at this price point was most impressive. We believe this particular unit offers the best combination of features and performance for your dollar.
Arkansas-based filmmaker Matthew Jeppsen is founder of the online production info resource FreshDV (www.freshdv.com), and a contributing partner with cineastfilms, an international wedding cinematography production company. Kendal Miller (www.impstudios.com) is an award-winning director of photography located in the Chicago area, and a contributing editor at FreshDV.

[ 本帖最後由 tmtcman 於 2008-2-4 14:44 編輯 ]

tmtcman

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底下是作者的前言:In Review: Follow Focus ShootoutBy Matthew Jeppsen and Kendal Miller
Today’s 35mm depth-of-field adapters promise a filmic look by making traditional cinema and still camera lenses compatible with affordable DV and HD cameras. The results can be mind-blowing—but the operator needs to be able to control the fully manual lens and compensate for potentially incorrect distance markings. The ability to control the DOF in your frame is only a positive factor if you can accurately keep the shot in focus.
Enter follow focus units. In essence, a follow focus is a dial that’s geared to match the gearing on a lens barrel, or the addition of a lens gear to an un-geared still image lens. The goal is to allow the focus puller to smoothly and easily adjust the focus of the lens from a comfortable position at the side of the camera. It will also allow you to set marks (usually on a marking disc), helping to ensure that for each point in a scene you can quickly and easily recall focus positions in a complex composition.
Operators of smaller-format cameras may find themselves in situations where shooting requires the addition of an AC (assistant cameraman) to pull focus. This process will be greatly improved by the use of a follow focus unit. It’s never fun to be reshooting takes because the crew is missing focus marks while the on-camera talent is giving 110 percent.
One issue to keep in mind with smaller cameras is the fact that their focus rings often rotate infinitely. This makes it next to impossible to ever set marks and have repeatable focus from one shot to the next. The addition of a gear ring with hard stops, such as the Zacuto Z-RP-HVX, makes it easy to achieve repeatable focus points by adding hard stops to the lens gear.
There are several factors to take into consideration when selecting a follow focus: the overall build quality and feature set, price point, and potentially most important, the amount of unwanted “give” or “play” inherent in the gear box of the unit. We extensively tested five popular follow focus units, taking into consideration each unit’s features, build quality, and even measuring the play in each gearbox. We used a millimeter scale and calipers to note the amount of give in each system. Three measurements were taken and averaged to determine gearbox play.
We tested the units for smoothness under stress on a Panasonic AG-HVX200 paired with a Cinevate Brevis 35mm adapter system, mounted on Zacuto 15mm rods and equipped with a Zeiss PL-mount 85mm T 1.3 lens, courtesy of Fletcher Chicago (www.fletch.com). We also tested each follow focus’ included accessories. With the exception of one unit, all arrived equipped with a standard cine 0.8/32 pitch gear, which interfaced directly with the Zeiss PL lens. You can view supplementary video footage from our lens tests online at www.freshdv.com/go/dvfocus/.

其中Indifocus試用的是舊款的...  

tmtcman

台灣的械石  (攝影怪兵器) 北市東興路 家樂福五樓

有REDROCK M2 與 Cavision 的追焦器可以試用

有需要的網友可以親自去試用

因為一般的店家不會擺追焦器出來(你有訂他才會進貨)

有些也不會花時間讓你試用(因為組裝需要花一些時間~)