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  #61  
Old 02-02-2017, 06:10 AM
mmalik (Mike)
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This is just a template that was created to cut 'Cold plate Inside' to spec; free hanging loop of cooper tape is about 2" long. Regards
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  #62  
Old 02-02-2017, 06:11 AM
mmalik (Mike)
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As a final step I added more insulation (arrow) at the sensor contact point and applied some di-electric grease for added protection from moisture. Regards


Note: Focus for di-electric were the ribbon cable connections mainly and some area around the center contact point
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  #63  
Old 02-02-2017, 06:13 AM
mmalik (Mike)
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This completes 'Cold finger Inside' installation.


Additional thermal separation of IBIS cover plate from the cold finger (arrows); cold finder in essence passes/hangs free except for two contact points, one to the sensor and one to the base panel. Regards
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  #64  
Old 02-02-2017, 06:17 AM
mmalik (Mike)
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Closure sequence and cold finger relationship to various layers as it gets buried...
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  #65  
Old 02-02-2017, 06:18 AM
mmalik (Mike)
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Sandwich view of the installed cold finger...


'Cold finger Inside' terminates at the internal base panel; external base panel 'not' yet attached. Regards
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  #66  
Old 02-02-2017, 06:19 AM
mmalik (Mike)
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All is well with cold finger in place...
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  #67  
Old 02-02-2017, 06:20 AM
mmalik (Mike)
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Relationship of the two base panels with each other and the cold finder...
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  #68  
Old 02-02-2017, 06:20 AM
mmalik (Mike)
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Zinc oxide thermal paste for mating the two base panels


Note: Both panels approximate 'very' well by default; this will improve conductance a great deal
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Last edited by mmalik; 02-02-2017 at 06:58 AM.
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  #69  
Old 02-02-2017, 06:21 AM
mmalik (Mike)
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Final status after 'Cold finger Inside' mod...


Note: Same copper tape was used to line the external base panel (as shown) for active cooler attachment and heat transfer; plus it protects camera from any marring from the active cooler


Metabones adapter is there for a reason; it will provide alternate tripod mounting since original tripod mounting will get occupied by the cooler
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  #70  
Old 02-02-2017, 06:23 AM
mmalik (Mike)
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Coldplate module installed on a7RII (...will fit the same way to any DSLR/MILC). Regards
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  #71  
Old 02-02-2017, 06:25 AM
mmalik (Mike)
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Doesn't block battery door...


Note: Special attention paid to Metabones clearance while building the module
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  #72  
Old 02-02-2017, 06:26 AM
mmalik (Mike)
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LCD and ports are fully accessible
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  #73  
Old 02-02-2017, 06:29 AM
mmalik (Mike)
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MILC/DSLR use with coldplate module attached is quite utilitarian. Regards


Note: a7S shown; Cat7 can be connected once all setup to power the system
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  #74  
Old 02-02-2017, 06:31 AM
mmalik (Mike)
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System can be powered with universal AC or 12V DC via PSU (power supply unit) or a PowerTank/Car battery, respectively. Regards


Note: Real-time coldplate temp. sensing displayed on PSU; PWM (Pulse Width Modulation) and POT control of cooling is built-in
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  #75  
Old 02-02-2017, 06:32 AM
mmalik (Mike)
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a7RII Test Results...
  • 30x3min, ISO2000, Darks
  • Cooler was attached and started at the start of the test
  • Test was conducted at room temperature
  • Initial coldplate temp reported by LED was about 72F
  • Coldplate temp. dropped to around 33F within first half hour
  • Coldplate temp at the end of the 1.5 hour long test was around 29F
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  #76  
Old 02-02-2017, 06:33 AM
mmalik (Mike)
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a7S Test Results...
  • 30x3min, ISO2000, Darks
  • Cooler was attached and started at the start of the test
  • Test was conducted at room temperature
Note: Most tests I have conducted show that it takes roughly about 1/2 hour (half hour) for convergence, i.e., noise in images dropping and stabilizing for the rest of the session...
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  #77  
Old 02-02-2017, 06:38 AM
mmalik (Mike)
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Something I noticed, size of in-camera JPGs decreased as sensor got colder...


Note: File size dropped to less than half; a7RII files shown


This is an indirect testament to noise reduction; of course I have shown more scientific RAW noise evaluation before (a7S)
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  #78  
Old 02-02-2017, 06:51 AM
mmalik (Mike)
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I have been using base mounted cooler (with a7S) for a long time now; 'Cold finger Inside' was the next logical step which has been a great success with a7RII. a7RII was a unique challenge since it is an IBIS system.


I'll be showcasing a7S 'Cold finger Inside' next whose results I have already shown. Stay tuned. Regards
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  #79  
Old 07-02-2017, 04:19 PM
mmalik (Mike)
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While I have already shown a7S 'Cold finger Inside' test results (below), following is how the cooling mod was actually performed.

a7S is bit different than IBIS systems; even if cooling mod were not performed, it has some cooling paths built-in. Regards
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  #80  
Old 07-02-2017, 04:22 PM
mmalik (Mike)
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I added two new 'Cold finger Inside' paths in addition to the default (below).

Here is the schematic of the primary 'Cold finger Inside' path for a7S; I chose this location since it is where 'Cooler @ the base' TEC is located.

Note: I am coining the term 'Cooler @ the Base' for the active cooler to differentiate it from the 'Cold finger Inside' where 'Cold finger Inside' becomes an extension of the active cooler.

a7S is one of those cameras where 'Cooler @ the base' may be sufficient even if 'Cold finger Inside' were not installed given its compact body and well established default paths. Regards
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Last edited by mmalik; 07-02-2017 at 04:37 PM.
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