DZOFILM CATTA Zoom Lens User Manual
- June 9, 2024
- DZOFILM
Table of Contents
DZOFILM CATTA Zoom Lens
Introduction
Thank you for your purchase of this product!
CATTA is DZOFILM’s high-performance full frame cinema zoom lens. It allows you
to reproduce the details and color in filming. Clear images, natural transition
from in-focus to defocus and minimal breathing in focusing…all these can be
found in CATTA zoom. A good companion for your documentory/ TVC/ MV/
commercials/ online movie/ variety show/ Live/ independent films, etc.
Safety Notes
- Please do not watch the sun or bright light source through the lens, otherwise it will cause visually disabled.
- Never use organic solvents such as paint thinner or benzene to clean the lens. Attach the front and rear caps when the lens is not in use.
- Store the lens and filter in cool, dry locations to prevent mold and rust. Do not store in direct sunlight or with naphtha or camphor moth balls.
- Please keep the lens dry and wipe the water droplets off if there are water droplets on the glass surface.
- Leaving the lens near heater or in other extremely hot locations could cause damage or warping.
- Use a blower to remove dust and lint from the glass surfaces of the lens or filter. To remove smudges and fingerprints, apply a small amount of lens cleaner to a soft, clean cotton cloth or lens-cleaning tissue and clean from the center outwards using a circular motion. Do not leave smears or touch the glass with your finger.
Lens Parts
- Front cap
- Lens Mark
- Focusing Ring
- Screw holes for accessories*˛10 （M°, °mm deep
- Zoom Ring
- Zoom Lever Socket
- Aperture Ring
- Lever socket of Mount
- Lock Ring of Mount
- Release Button of Mount
- Plug-in Rear Filter
- Rear Cap
- Support base
Lens Control
Focus Control
Rotate the focus ring to increase or decrease the focus distance.
Zoom Control
Rotate the zoom ring to zoom out, increasing the area visible in the frame or
zoom in on the subject so that it fills a larger area in the frame.
Aperture Control
Rotate the aperture ring to stop aperture down, raising the T-stop and
narrowing the aperture, or lower the T-stop to widen the aperture.
Mount Changing
Scan the code below to watch the tutorial video or go to DZOFILM website – Support – Q&A – Lens Tutorials – CATTA to watch the video. (Click to jump to the website)
Note: In general situation, there is no need to adjust the shims after changing the mount. If you still need to adjust the flange back distance, please refer to the next section Flange Back Adjustment.
Mount Disassembling
Step One: Rotate the Lock Ring 90 degrees anticlockwise till the Ring cannot be rotated anymore.
Step Two: Press Lock Button, rotate the mount (silver part) anticlockwise and in the meantime pull out the mount.
Mount Installation
Step One: Please make sure that the Lock Lever Socket is at the top left side (see in the picture).
Step Two: Align the breach under the mount to the embossed screw on the mount plane, lay down the mount.
Step Three: Press the Lock Button and rotate clockwise till hear a sound of “clatter”.
Step Four: Rotate the Lock Ring clockwise to the top. The mount is locked.
Install/ Disassemble the Rear Filter
Hold the handle of the rear filter and you can pull in or out the filter.
Flange Back Adjustment
DZOFILM will check and adjust flange back distance of all CATTA lenses before shipping. But the flange back distance might have slight difference among different cameras. To achieve the best performance and match different cameras, flange back adjustment is needed.
Preparation
Step One: Ready your subject. You can use a “Star Chart”, or other high-
resolution black-and-white objects;
Note: You can download and print the chart on DZOFILM website-Download-
Star Chart for Adjusting Back Flange（Click to jump to the website）
Step Two: Attach the lens to the camera;
Step Three: Select the maximum aperture (wide open);
Step Four: Set the object ˛.˙m away from the camera sensor plane, and
adjust it to the center of the whole image.
Flange Back Adjustment
Step One: Rotate the zoom ring to the longest focal length, and rotate
the focus ring until the image to its clearest, mark down the focusing
distance S1;
Step Two: Rotate the zoom ring to the widest focal length and rotate the
focus ring until the image to its clearest, mark down the focusing distance
S2;
Step Three: Compare the difference between S2 and S1. If S2<S1, then need
to add shims; otherwise decrease the shims,
Note: The shim adjustment is evaluated on the angle between S˜ and S˛. If
the angle is bigger, then need to change more shims and vice versa.
Step Four: Repeat step1˛2 until S2=S1˛. Then it means the lens in under
parfocal.
Take CATTA zoom °˙35-80mm as an example:
Rotate the focal length to 80 mm, and focus till the image is at its sharpest,
the focusing distance mark is1.5m S˛1. And then rotate the zoom ring to °˙mm,
re-focus to the image at its sharpest, current focusing distance mark is 1.4m
(S2). S2<S1. According to the sheet below, add 0.12mm shims on the lens mount
and double check. At this time, both °˙mm and 1.5mm focus at the closest under
˛.˙ focus mark. That means this lens is under parfocal.
35-80mm shim adjustment reference
35-B0mm shim adjustment reference
80mm focusing mark S（1 m）|
1.5
35mm focusing mark S2（m）|
1.2
|
1.3
|
1.4
|
1.5
|
1.6
|
1.7
|
1.8
|
2
|
2.2
Shim adjustmen（t mm）|
+0.3
|
+0.19
|
+0.12
|
0
|
-0.08
|
-0.13
|
-0.18
|
-0.23
|
-0.3
70-135mm shim adjustment reference
70-135mm shim adjustment reference
135mm focusing mark S（1 m）|
1.5
70mm focusing mark S2（m）|
1.4
|
1.45
|
1.5
|
1.55
|
1.6
|
1.65
Shim
adjustmen（t mm）
| +0.3| +0.13| 0| -0.1| -0.22| -0.3
Note: Shim adjustment: “+” means adding shims, and “-” decreasing shims.
Specification
Specification
Focal Length| 35-80mm| 70-135mm
Mount| E/RF/L/X/Z
Aperture| T2.9-22
Image Circle| Φ43.5mm (FF)
Close Focus (Metric/ Imperial)|
0.74m/2ft5in
|
0.76m/2ft6in
Zoom Ratio| 2.3X| 1.9X
Mag. Ratio (Close Focus)| 35mm: 0.0657
80mm: 0.146
| 70mm: 0.112
135mm: 0.214
Flange Distance| E=18mm，L/RF=20mm，X=17.7mm，Z=17mm
Iris Control| Manual, max 75°| Manual, max 80°
Focus Control| Manual, max 270°
Zoom Control| Manual, max 100°
Front Dia. (Metric/Imperial)|
Φ80mm/3.15″
Filter Size| M77
Length (Metric/Imperial)
| From lens front plane to flange back: 212.4mm/8.36（” RF/L）; 214.4mm/8.44（” E）;
214.7mm/8.45″(X）; 215.4mm/8.48″(Z）
Iris Blade| 16
Weight| 1532g| 1597g
After-sales Service
Repairs： Return the product to the point of purchase for repairs. Please note that we reserve the right to refuse service in the event of damage so severe that there is little hope of function being restored, whether said damage is caused by physical shocks, exposure to or immersion in sand, mud, or water or the like.
Warranty service： Should the product malfunction in the course of normal use as set forth in the user’s manual and accompanying documentation, it may be returned to the point of purchase for repairs within warranty period. The owner is responsible for all shipping costs. The warranty period varies with the country or region of purchase. Stored dated receipts or other proof of purchase in a safe place, as it will be required for repairs made under warranty.
Service Outside the Warranty Period： Request for service will normally be accepted within a period of roughly 5 years following the end of production, during which time spares will be kept on hand, although owners may be offered an equivalent product during this period in the event that spares are not available. Compatibility with consumables and accessories for the original product is not guaranteed. To prevent waste, repairs or replacement may be made using refurbished parts or products, and DZOFILM may collect returned parts or products for later use. When returning a product for repair, please let us know if you need the original parts.
Privacy： DZOFILM obeys all applicable laws and regulations concerning the handling of names, addresses, phone numbers, and other personal information provided by users.
The Name and Content of Hazardous Substances
Shenzhen Dongzheng Optical Technology Co., Ltd.
1F., Building One, Xinwuxia Industrial Park, No.32, Cuibao
Rd., Baolong St., Longgang Dist., Shenzhen 518000, China