STT-8300M Backfocus -- Which Number is Correct ?

Hi All,

A new STT-8300M owner here.
I need to calculate the backfocus to get the right spacers to connect my SST to FSQ-85 (+ reducer).

I found there are DIFFERENT backfocus data from SBIG website.

For example, from the backfocus table -- the camera-only STT is 16.2mm
https://www.sbig.com/support/product-documentation/backfocus-table/

However, from the product pdf file -- it is 17.5mm
https://www.sbig.com/site/assets/files/1402/stt8300_051612.pdf

Which one I should trust ?
Is the backfocus table still the right one ?
Thanks.

-Kai

 

Kai,

The manuals and product sheets are being updated.
The engineers measured all the backfocus measurements and created the newer chart here:
https://www.sbig.com/support/product-documentation/backfocus-table/
Please go by this above as the product sheets are old and are being updated.

 

Tim,

Thanks for the quick response.
Can I assume this is also applied to the STT-830om that you guys sold last year (2014?).
I got mine used ...

-Kai

 

All cameras are correct here:
https://www.sbig.com/support/product-documentation/backfocus-table/

thanks for sending me a Skype.

 

Tim,

Great to chat with you and thanks for the wonderful customer service.

-Kai

 

Hi Tim,

Is the information in the link correct for all STT 8300 regardless of date of manufacture?

Mark

 

Mark, As far as I know. I was told this chart was accurate for the STT's
http://www.sbig.com/support/product-documentation/backfocus-table/

 

Thanks, Tim.

As a matter of interest, the numbers given in the table for STT8300+Standard Filter Wheel with 3mm filters+Faceplate add up to 0.4mm shorter than previous numbers I obtained in 2013.

Regards,
Mark