本帖最后由 人比黄瓜瘦2007 于 2015-6-18 16:11 编辑
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http://www.centralds.net/cam/?product=astro-6d-cooled-eos-6d-2
01 Dec 2014/ Comments Off /in Cooled DSLRs, News/by liyun
Astro 6D is a cooling modified camera of canon eos 6D camera.
Until now we are modifying canon’s DSLRs to cooled camera with two type.
The one is to insert cooling module into camera body, the others isthe re-configureing of camera system as in case of CDS-5D.
The inner space of 6D, A7s is so tight and it’s impossible to install the cooling module into body. And we introduced a new modification concept to modify 6D and A7s.
A. Take out of Image sensor
We tried to take out the image sensor in a camera body and moved it to lens direction and make cooling module. We think it’s proper solution to modify 6D camera having tight inner space.
We have a question about the reliability on extended CMOS connection cable and try to test it.
Before we perform this test, we strengthen the ground circuit and make heat sink and cold block to unite in to camera’s ground circuit and made shield covers.
With the extended cable the camera works well without any errors in still shot photography and movie mode. I guess that the CMOS cable delivers only digital signals and the lines are composed with pairs and additional ground and shield helped to increase the stability of circuit.
The Image sensor taken out from body is having merits and demerits.
Demerits:
First is ignored mechanical shutter because the CMOS is moved from the back of shutter to front of shutter.
Canon’s DSLRs control the amount of light into image sensor by the combination of mechanical shutter and electric shutter.
And modified 6D’s exposure time will be controlled only by electrical shutter and the exposure control of sub second shots is not reliable.
You can see more informations from below link:
http://www.centralds.net/cam/?p=7533
Second is the fact that we can’t use optical viewfinder any more. But you can focus using Live view mode.
Merits
1.Drop-In Filter system : The back focus distance between image sensor and lens mount became the space for drop-in filter holder. This system make possible to install the filters without lens detaching.This is very useful for narrow band imaging.
Astro 6D’s back focus distance is aligned to 44mm as same to canon EF mount.
2. The cylindrical heatsink and cooling module in front of camera body is simillar to the shape of normal DSLR cameras and it’ll give more good user experience.
3.The mirror holder of full frame DSLR cameras cast a show to the image sensor when it is lifted to take shots.
The amount of the light is not so serious but this make t the irregular he background in brightness.
This is so troublesome when you try to make mosaic images but modified Astro 6D has no obstacles in front of CMOS sensor.
B. New cooling system
A7s is so good camera for movie recording. But when it’s in recording or shooting shots the temperature of image sensor rise to ambient air temperature + 7C over. This rising temerature gives the noise to output image. Particularly in case of low light photography this internal heat is major target to overcome.
We designed a cylindrical heat sink through 3D modeling and manufactured by MCT machine. This heat sink having sufficient radiation areas and it can cool down the temperature of image sensor ambient temperature – 6C~7C when 4V DC powered to TEC without cooling fan.
Because the sensor temperature of unmodified 6D is Ambient temperature +7C~8C, The passive cooling of Astro 6D is having 14C~15C cool down effect than unmodified 6D. This will help to produce good quality movie and low light images.
Passive cooling is fanless cooling system and the camera is silent. The current consumption is about only 0.8Amp and in case of you use 12V 12Ah read sealed battery you can operate the cooling system about 15hours continuously
2. Active cooling: If you attach EXcooler to the bottom side of heatsink and operate the cooling fan. In this case 8.5V DC is supplied to TEC and though this ‘active cooling’ the temperature of image sensor will drop to ambient air temperature -18C (+2C ~ -2C).
3.Detachable EXcooler: the products of ‘Noctua’ Austria company is famous as silent and high performance cooling fans.
We installed two 40mm notch fans to EXcooler and power circuit board for 18.5V out for TEC. This EXcooler easily can be attached to bottom side of heat sink using one 1/4” screw bolt.
4.Digital Thermometer: For monitoring of the temperature of image sensor we offers digital thermometer as basic accessary with Astro 6D set.
C. Dark Fram Comparison of Cooled 6D
1. Indoor temperature, ASA1600, 450sec, RAW, 500x500pixels center Crop (Original)
2. Indoor temperature, ASA1600, 450sec, RAW, 500x500pixels center Crop (Photoshop Level 255 -> 30)
D. Adapters for Astro A7s
Information of the product :
＊Cool down the temperature of CMOS sensor about 18 Celsius degree(±2℃) from that of ambient air.
＊Absolutely high-Quality image in B-shutter use compared with usual DSLR
＊Realtime Monitoring of the cooling temperature by digital thermometer
＊Drop-in filter system
＊Use of high efficiency Thermo electric cooler module.
＊Power: 12V, 3.0A DC
＊Low Pass Filter Removed.
＊Optimal design by 3D CAD modelling
＊Precision manufacturing by CNC machine
＊Perfect tuning of optical axis of CMOS sensor by 3 point alignment
＊Permanent Anti-dew system applied.
*Detachable Excooler (40mm cooling fan 2pcs & Power supply) included.
*Live-view Focus function alive.
*Mechanical Shutter and Sensor Cleaning function are disabled.
Various Adapters for Astro 6D
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变色卡
千斤顶
显身卡
