YE0121 Sector Star Test Chart (72 cycles) for the adjustment of camera lenses and checking back focal distance

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$480.00 - $500.00 / Sets | 1 Set/Sets (Min. Order)
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Place of Origin:
Guangdong, China
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1000 Unit/Units per Week
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Shipped in 7 days after payment

YE0121 Sector Star Test Chart (72 cycles) for the adjustment of camera lenses and checking back focal distance


Product Instroduction

The YE0121 test chart is designed for the adjustment of camera lenses and checking back focal distance. It shows a 72 sector Siemens star on a white background.

The YE0121 test chart is designed for

  • adjustment of camera lenses
  • checking back focal distance

With the aid of a low transmission filter and by means of low level lighting make sure that the camera is not over modulated with the aperture in the open position.

  1. Optical focus: Adjust focus of zoom lens at greatest focal length.
  1. Back focal distance (lens): Adjust focus at shortest focal length by regulating lens mechanically with adjustment screw and optimize alternatively with a).
  1. Back focal distance (pick-up tubes): If focus varies from channel to channel between greatest and shortest focal length, the individual pick-up tubes must be adjusted mechanically in the optical axis.
  1. Select white channel. Set optical focus at greatest focal length. With shortest focal length and divergent focus adjust the pick-up tube in W-channel until optimum focus is achieved. If necessary optimize by alternating with optical focus adjustment.
  2. With unchanged optical focus adjustment and shortest focal length adjust the red and blue pick- up tube until optimum focus is achieved. Image focus (focus adjustment) is maintained at all focal lengths (zoom-in) and constant distance from object by means of back focal distance adjustment.


Resolution test chart is the standard proof which can provide aided testing for vertical resolution and horizontal resolution of actual shooting. 

Resolution test uses ISO 12233 resolution test chart and adopts unified shooting angle and environment. 


The calculation of resolution test uses HYRes software, and the calculation will be done in two parts: vertical resolution and horizontal resolution. 


Digital camera assessment is different from other products. It’s unlike laptop and DIY which have a lot of software to test objective data and everything can be seen from the data. However, assessing the quality of digital camera not only needs certain objective data, but also needs to combine actual operation and the shooting proofs. Therefore, our assessment is based on the principle of objective data and combined rational analysis from the experienced reviewers to obtain the most objective assessment results. 




Specification            Active Area                Material

      1 X               20 cm x 35.6 cm       Photographic Paper

      2 X               40 cm x 71.1 cm       Photographic Paper

      4 X               80 cm x 142.2 cm     Photographic Paper

      8 X               160 cm x 284.4 cm   Photographic Paper

      0.5X             10cm x 17.8 cm        Photographic Paper


Other test chart




Company Information

Shenzhen 3nh Technology Co., Ltd. is a high-tech enterprise. We research, develop, produce and market photoelectric detection products in photoelectric detection technology field and color management field. 


The parameters of test results are integrating with international standards. Our 3nh brand colorimeter spectrophotometer products are exported around the world. We can provide customization service which has been well received by customers.


Contact detail


Melorae Huang 
Sales Manager
Add: Building 8, Nangang Second Industry Zone, Xili,  Nanshan District, Shenzhen, China.
Tel: (86)-755-26508999 Ext:681
Fax: (86)-755-26078633
Mobile: (86)-13925280965
Skype: melorae_3nh_
Wechat: 13925280965
Whatsapp: +86-13925280965
Waiting for your inquiry, any more questions I will reply you within 24 hours 
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