People who have used sigma usb dock or a Tamron Tap in console?

Brazo

Brazo

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when measuring distance do you go from chart to sensor or chart to end of lens?

Tia:)
 
It should be to the sensor plane but I don't think you really need to worry about this for what you're doing.

I've only used the Sigma dock (but I guess tamron is similar), but let's say you're calibrating a lens for 0.4m range. Just move the object to approximately 0.4 from middle of camera. Focus on it and see if the lens is roughly focused at 0.4m. Move it until it is. Doesn't need to be exact, you're just calibrating within an approximate range here. So you get your distance approximately right and then fine tune it.
 
gad-westy said:
It should be to the sensor plane but I don't think you really need to worry about this for what you're doing.

I've only used the Sigma dock (but I guess tamron is similar), but let's say you're calibrating a lens for 0.4m range. Just move the object to approximately 0.4 from middle of camera. Focus on it and see if the lens is roughly focused at 0.4m. Move it until it is. Doesn't need to be exact, you're just calibrating within an approximate range here. So you get your distance approximately right and then fine tune it.
Click to expand...

Thanks but with a 24-70 it can make quite a difference. It’s asking for 0.38m which if I did it from end of lens would be 50% longer than to sensor as lens is so long.

Chart to sensor it is then!
 
Brazo said:
Thanks but with a 24-70 it can make quite a difference. It’s asking for 0.38m which if I did it from end of lens would be 50% longer than to sensor as lens is so long.

Chart to sensor it is then!
Click to expand...

Yeah, that's not really what I was getting at though. I just meant that you don't need to get a tape measure out or worry exactly where your reference points are. Just simply pop the camera on a tripod and move your target until the lens is hitting 0.38m on the focus scale when it locks to it. Then start the fine tuning process.
 
gad-westy said:
Yeah, that's not really what I was getting at though. I just meant that you don't need to get a tape measure out or worry exactly where your reference points are. Just simply pop the camera on a tripod and move your target until the lens is hitting 0.38m on the focus scale when it locks to it. Then start the fine tuning process.
Click to expand...
Do you know I didn’t think of using the focus scale!
 
Well the focus scale was a rough approximate given the numbers (say 0.38) were about 5mm long and 5mm is a huge amount of focus throw...

Anyways I stopped worrying precisely about distance and focused on getting a good clean set of results. I used Reinkan Focal for the mfd and 1m distances and used my own judgement for the infinity setting. I did this three times (was a bit stop start and tried different ambient lighting levels).

A huge amount of frustration and time spent but my Tamron G2 24-70 now focuses accurately wherever I point it regardless of focal length which is far better than my Nikon lenses ever did!

Just got the 70-200 G2 to do now but I suspect t it will be easier now that I know what I’m doing...

FWIW my one Nikon lens 85 1.8 was deemed by ‘Focal’ to be sent back to the manufacturer as it was outside the correctable range!
 
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