LV and Rangefinder @ low light

[jaeger]

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Has anyone noticed the light meter reading is different between LV and rangefinder at low light environment?  I get lower ISO and shutter speed thru rangefinder than LV or EVF.  As result I get darker pictures using rangefinder.  The light meter setting is classic and center weight. 

[Exodies]

I tried this with fixed ISO 200 and got exposure times of 0.7 sec LV, 0.5 sec RF, f4.

I tried this with auto ISO and got exposure times of 1/12 sec LV, 1/8 sec RF both at ISO 400, f2.

Each variation was shot five times with the same result.

Exposure isn’t science that’s why we appreciate playback.

 

[jaeger]

Thanks for verifying Exodies.

I hope you have a Leica flash, I use SF64 but I think any Leica flash with TTL will do.  Anyway, if you do please use TTL on the flash and auto shutter, auto ISO on camera and see what do you get between using EVF or LV and just rangefinder.  I get very different results for having EVF/LV on or off. 

[Jean-Michel]

Not surprising. When using LV or EVF, the exposure is measured by the sensor, in the general central area if set to centre-weighted , directly from the image formed by the lens. When using the RF, the incoming light is bounced from the white shutter blade onto the measuring sensor, the bounced light is more of an aggregate or diffused light, more like that of a hand-held reflective light meter. 

[Exodies]

With SF58 flash with TTL, no difference in shutter speed or ISO. Results look the same too.

[jaeger]

21 hours ago, Jean-Michel said:

Not surprising. When using LV or EVF, the exposure is measured by the sensor, in the general central area if set to centre-weighted , directly from the image formed by the lens. When using the RF, the incoming light is bounced from the white shutter blade onto the measuring sensor, the bounced light is more of an aggregate or diffused light, more like that of a hand-held reflective light meter. 

I think you are correct.  it gives me more discrepancy when shooting backlit objects in low light environment.  I have to use EVF to get more accurate exposure otherwise it's all dark even with SF64 flash.  

 

 

 

[jaeger]

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20 hours ago, Exodies said:

With SF58 flash with TTL, no difference in shutter speed or ISO. Results look the same too.

Please try pointing at a subject with light source in its background, maybe a TV or desktop light or something backlit the picture.  I get all dark using RF, all good with EVF.

[Exodies]

My scene was a bookcase so fairly even over the whole frame. I’ll try something else.

[Jean-Michel]

7 hours ago, jaeger said:

I think you are correct.  it gives me more discrepancy when shooting backlit objects in low light environment.  I have to use EVF to get more accurate exposure otherwise it's all dark even with SF64 flash.  

 

 

 

I do not use a flash with my M’s, so I don’t really know what the issue might be, but I checked the manual for flash settings. I don’t want to be insulting, but is it possible that you do not do the half-press to allow the exposure reading before fully pressing down the shutter, according to the manual, the flash then does not fire, perhaps resulting in the under-exposure.