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Using BYEOS with Optolong dslr l-pro filter and mirror lockup


phtracy
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I have recently installed an Optolong dslr l-pro filter on my Canon 6D.  This filter is the plug in type that fits behind the lens/telescope and in front of the sensor.  This requires the mirror to be permanently held in lock up position.  I tried it with BYEOS and everything seems to work fine including Frame and Focus session as well as a short capture plan with multiple subframes.  So I really am not noticing any change in operation.  My question is whether there is anything else I need to know about or be concerned about when operating the camera this way.  The mirror is mechanically held in lock up because the filter prevents it from dropping down.  I don't think BYEOS is utilizing the electronic lock up mode and even it was the mirror would be permanently held in lock up by the filter.  I just want to make sure I am not going to introduce any type of mechanical wear or failure by operating long term with many cycles in this mode.

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Let us know of your Impressions as you use your new L-Pro Filter.  As long as your Light Pollution doesn't have a large component of the new Full-spectrum LED Street Lights, you should see great results.  You will likely need / can perform longer exposures, given that the Filter blocks a significant amount of light from certain portions of the visible spectrum.  You will also likely have moderate White Balance issues - but these are readily addressed in Post Processing.

Good Luck...

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s3igell,

Yes I get that part about the optical impact of the filter.  I am really wondering about the mechanical part of how BYEOS works when the camera is permanently holding the mirror up.  If you are shooting manually and you turn mirror lock up mode on, the first push of the shutter button flips the mirror up and the second push of the shutter button takes the exposure.  That way the picture is taken without any mirror flap which can be an issue in some special cases.  From what I understand, BYEOS never programs the camera into mirror lock up mode.  However, the mirror is permanently held up by the filter which prevents the mirror from dropping back down again.  So you are in mirror lock up due to a mechanical blockage holding it there.  I think BYEOS then just takes the exposure normally without setting any mirror lock up mode.  So my real question is whether is OK to take lots of exposures with the camera in normal mode but the mirror mechanically held in lock up mode.  My assumption is its OK, but thought I would look for confirmation.

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On 9/17/2021 at 4:50 PM, phtracy said:

So my real question is whether is OK to take lots of exposures with the camera in normal mode but the mirror mechanically held in lock up mode.

That would seem to be a question for your Filter Vendor, or for Optolong themselves, or ultimately for Canon.

O'Telescope / BackyardEOS has had no part in any of that Engineering this Filter Design, nor any reason or opportunity to do Real World Tests.  BYE is only Software that utilizes the Canon SDK to enable Camera Control during AP Imaging Sessions.  It cannot do anything that Canon SDK doesn't Allow.  Hence, BYE can't Break Your Camera.  And in reality, BYE will have no way to know if the Mirror Box is Open or Closed - it only Assumes the Successful Operation of the triggered Exposure (which implies the Activation of the Mirror Box).

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