Dark frame noise reducing

[conger]

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Thanks for your thoughts Flash.

 

I was not really referring to 'opening' the camera's firmware, but rather suggesting that the manufacturer should extend the camera's usability (for the consumer) by publishing an interface to the top level control sw. (probably XML... if they have any sense) which is used within the camera anyway!

 

I have worked on LEITZ (now all LEICA companies) imaging systems before, and the engineers are excellent. They will not have cut corners in the fw. architecture (as some of the other major manufacturers do!). They will have used a structured approach to facilitate the GUI development... and also the QA testing, and of course FW (multi platform) re-use.

 

BTW... one of the limitations to longer exposure times (my theme) is what happens when the sensor warms up. This is normally caught by the additional circuitry on the chip which will initiate a shut down if the temperature becomes unpleasant. No manufacturer wants over temp. events reported, so they try to avoid this by adding an operational corset, like by capping the exposure time.

 

My position is that the manufacturer should abrogate responsibility for the technical excellence of the results, where the operator goes outside the envelope. Physical damage to the camera should be caught by existing mechanisms which will crowbar as soon as danger approaches.

 

BTW... I sent some queries about the SL to Leica. Other than an auto-reply offering me a 'timely' (zeitnah) response, that was it... after 3 days.

Nichts für Unguat!

-g-

[DezFoto]

BTW... the sensor physics say that the new Hasselblad should offer more attractive long exposure noise performance (larger pixel size), I am reading about the camera warming up when it is thrashed. 

 

You mean the X1D? I think the battery life might be a concern as well. Most people get 250-280 shots on a charge, so if you're doing really long exposures that might be an issue. I don't know if there's a way to power if off mains or not. And yeah, heat usually means more noise, unfortunately 

[conger]

You mean the X1D? I think the battery life might be a concern as well. Most people get 250-280 shots on a charge, so if you're doing really long exposures that might be an issue. I don't know if there's a way to power if off mains or not. And yeah, heat usually means more noise, unfortunately 

 

I wrote to Has. a few weeks ago for clarification on the specs (one Has. spec gave max exp as 60 seconds... other Has. spec gave 60 mins)... and included external power source query.

 

I am waiting.

 

I smell a rat.

 

-g-

[J S H]

I wrote to Has. a few weeks ago for clarification on the specs (one Has. spec gave max exp as 60 seconds... other Has. spec gave 60 mins)... and included external power source query.

 

I am waiting.

 

I smell a rat.

 

-g-

No need to look for an exotic solution to solve the long exposure problem. Just buy any recent full frame Canon camera (i.e. 1DX/5D3 or newer). You should be able to do a 6-8 hour exposure at base ISO with no LENR and clean results. Lightroom automatically fixes any hot pixels. I shoot with Leica, Sony & Canon systems and Canon is by far the best for clean long exposures (1DX2 is the very best).

[steppenw0lf]

There are even special models dedicated for astro use. They can probably also be abused for other long-time exposures.

Did not try them, but being customized for that, they should be preferable to any general purpose camera. Having an extra high sensitivity for infrared rays makes them also interesting for other topics.

For example the 60Da was called a "astrocamera".

There is the ACK-E6AC A/C power set for long-time use. Works also with other cameras. (5D mk II, 5D mk III, 5Ds)

There is also ACK-E8 for the rebel cameras.

 

Too bad there is no equivalent A/C power adapter for the SL.

[Giulio Zanni]

The dark frame noise reduction cannot be matched by post-processing. It is an illusion to think that switching it off and using Dfine or such could match the result. In fact, without the dark frame (one could see it momentarily on the M8) the image looks awful.

I am sure that those clamoring for an override would use it - once  and never again.

 

 

My original Sony A7r was excellent up to 15 minutes with LENR turned off

[DezFoto]

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My original Sony A7r was excellent up to 15 minutes with LENR turned off

 

My RX1r does a good job up to 5 minutes with no dark frame. Besides, you can always take a single dark frame with the lens cap on and use it in Photoshop to do your own dark frame extraction.