Fred Miranda wrote:
The TTA 40/2 is indeed about two-thirds of a stop faster according to my calculations. What I notice is that when you compare them side by side, focusing on the same subject at the same distance, the blur appears quite similar because of its wider field of view. Also, if you check the entrance pupil on these lenses, the TTA is noticeably larger.
OK. I double checked now and I made mistake using the wrong metered area. I corrected my post above. Thank you!
Thanks for the information on the 20250811 firmware. Would you be able to share it with us? I would love to try it and see if it keeps the same performance at f/2 while improving reliability when stopped down a little.
The firmware (FE-mount) version 250811 can be obtained using the link in post #14 this page.
Fred Miranda wrote:
The TTA 40/2 is indeed about two-thirds of a stop faster according to my calculations. What I notice is that when you compare them side by side, focusing on the same subject at the same distance, the blur appears quite similar because of its wider field of view. Also, if you check the entrance pupil on these lenses, the TTA is noticeably larger.
OK. I double checked now and I made mistake using the wrong metered area. I corrected my post above. Thank you!
Thanks for the information on the 20250811 firmware. Would you be able to share it with us? I would love to try it and see if it keeps the same performance at f/2 while improving reliability when stopped down a little.
Firmware 20250811. Let me know if the download doesn't work. It's a while since I shared anything over Dropbox.
Aug 31, 2025 at 03:24 PM
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