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Tobenn

Sigma 18 - 35 f1.8 with SpeedBooster Ultra on FS7 still vignetting!?

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Hi all, 

hoping someone can help me with this. 
 

I recently purchased a Metabones Speed Booster ULTRA so I could use my Sigma 18-35 f1.8 on my FS7... but annoyingly , despite updating the firmware on the metabones, there is still a noticeable vignette on the corners Of the image when you zoom out to 18mm. 

The set up works fine with my 24 -105 canon lens just not the sigma... 

any thoughts or experience for anyone with this??

any help appreciated 

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This is because the Speedbooster is designed to expand full frame lenses to a S35 sensor to get a full frame "look".

The Sigma 18-35 is not a full frame lens, it's a S35 lens. Therefore it will vignette when used on a Speedbooster.

It is not designed to work with a Speedbooster.

The Sigma 24-35 is full frame and will work with a Speedbooster.

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Okay, thanks for your reply.

It doesn’t vignette on my gh5 / spoedbooster combo so I thought it was full frame like my canon 24-105. 

Would it work on my FS7 with just a basic Sony e-mount adapter that wasn’t a speed booster ? 


Thanks for your help. 

 

 

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On 9/4/2020 at 2:23 AM, Tobenn said:

Would it work on my FS7 with just a basic Sony e-mount adapter that wasn’t a speed booster ? 

 

If the adapter doesn't change the crop factor at all, I suppose it should work. It would be a S35 lens on a S35 sensor, so yeah, probably. However I haven't tested this combination, so this is mostly a somewhat educated guess.

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