Changes to V2.51 from 2.50 [Corrected items] Improved accuracy of the star-tracking for Astrotracer shooting when “2 Type 2” is selected under Menu Item C, “6. Bulb（B）Mode Options.” Improved stability for general performance. * When this update is done, the contents of version 2.50 and earlier will be also updated. * When this update is done, you will not be able to restore back to version 2.50 or earlier. * This firmware includes open-source software. The applicable licenses are described in the text files included in the download. Changes to V2.50 from 2.42 [Corrected items] Improved stability for general performance. Changes to V2.42 from V2.41 [Corrected items] Corrected --- In firmware versions 2.40 and 2.41, there was an issue where the operation becomes unstable after shooting when the white balance setting is set to "Multi-pattern Auto WB". Improved stability for general performance. * When this update is done, the contents of version 2.41 and earlier will be also updated. * When this update is done, you will not be able to restore back to version 2.41 or earlier. Changes to V2.41 from V2.40 [Corrected items] The following problems that occurred when updating to firmware version 2.40 have been corrected. Corrected --- Images cannot be recorded when the ASTROTRACER Type 3 mode is combined with the interval shooting function Corrected --- The SD card slot indicators 1 and 2 on the upper LCD panel flash to indicate that the memory capacity is empty, even when some capacity is still available. Corrected --- The number of remaining shots available is incorrectly displayed in the viewfinder. Corrected --- In the ASTROTRACER Type 3 mode, the exposure countdown on the upper LCD panel advances at unintended moments. Improved stability for general performance. * When this update is done, the contents of version 2.40 and earlier will be also updated. * When this update is done, you will not be able to restore back to version 2.40 or earlier. Changes to V2.40 from V2.31 [Enhanced features] The following model has been added to the lens subject to the focus limiter function. HD PENTAX-DA 35mmF2.8 Macro Limited. Added Astrotracer Type 2 and Type 3.　 For details.Click here [Others] Improved stability for general performance. * When this update is done, the contents of version 2.31 and earlier will be also updated. * When this update is done, the contents of version 2.31 and earlier will be also updated. Changes to V2.31 from V2.30 Simplified fonts have been updated. * When this update is done, the contents of version 2.30 and earlier will be also updated. * When this update is done, you will not be able to restore back to version 2.30 or earlier. Changes to V2.30 from V2.20 [Enhanced features] Added custom image Special Edition [Gold]. For more details click here [Others] Optimized operation when the HD PENTAX-FA 50mmF1.4 and smc PENTAX-FA 50mmF1.4 Classic are attached. Improved stability for general performance. * When this update is done, the contents of version 2.20 and earlier will be also updated. * When this update is done, you will not be able to restore back to version 2.20 or earlier. Changes to V2.20 [Enhanced features] Added custom image Special Edition [HARUBENI]. For more details click here * It can be used when attaching the following compatible lenses. HD PENTAX-FA 77mmF1.8 Limited HD PENTAX-DA 20-40mmF2.8-4 ED Limited DC WR [Others] Improved stability for general performance. * When this update is done, the contents of version 2.10 and earlier will be also updated. * When this update is done, you will not be able to restore back to version 2.10 or earlier. Changes to V2.10 [Enhanced features] Added custom image Special Edition [FUYUNO]. For more details click here * It can be used when attaching the following compatible lenses. HD PENTAX FA 31mmF1.8 Limited HD PENTAX-DA 35mmF2.8 Macro Limited Added focus limiter function * It can be used when attaching the following compatible lenses. HD PENTAX-D FA MACRO 100mmF2.8ED AW [Others] Improved stability for general performance. * When this update is done, the contents of version 2.00 and earlier will be also updated. * When this update is done, you will not be able to restore back to version 2.00 or earlier. Changes to V2.00 [Enhanced features] Added limited function [Grad ND Shooting]. * A special activation key (release key) obtained from a website or other source is required to activate the limited functions. Note: The Grad ND Shooting activation key issuance is a service that will be launched first in Japan. the launch of this service outside of Japan has not yet been determined. * Added custom image Special Edition [KYUSHU]. For more details click here * It can be used when attaching the following compatible lenses. HD PENTAX FA 43mmF1.9 Limited HD PENTAX-DA 70mmF2.4 Limited HD PENTAX-DA 40mmF2.8 Limited HD PENTAX-DA 21mmF3.2 AL Limited [Others] Improved stability for general performance. * When this update is done, the contents of version 1.40 and earlier will be also updated. * When this update is done, you will not be able to restore back to version 1.40 or earlier. Changes to V1.40 [Enhanced features] Added [KATEN] to Custom Image. For more details click here * It can be used when attaching the following compatible lenses. HD PENTAX-D FA 21mmF2.4ED Limited DC WR HD PENTAX-DA 15mmF4ED AL Limited Changes to V1.30 [Enhanced features] Added [SATOBI] to Custom Image. [Others] Improved stability for general performance. Changes to V1.21 • Optimized focus operation for new lens HD PENTAX-DA*16-50mmF2.8 ED PLM AW lens. Improved stability for general performance. Changes to V1.20 Optimized focus operation for new lenses HD PENTAX-FA 31 mm F1.8 Limited, HD PENTAX-FA 43 mm F1.9 Limited, HD PENTAX-FA 77 mm F1.8 Limited lenses and smc PENTAX-FA 31mm F1.8AL limited, smc PENTAX-FA 43mm F1.9AL limited and smc PENTAX-FA 77mm F1.8AL limited lenses. Changes to V1.05 Optimized performance when attaching new lens HD PENTAX-D FA*85mmF1.4ED SDM AW. Improved stability for general performance Changes to V1.04 Optimized performance when attaching new lens HD PENTAX-DFA70-210mmF4ED SDM WR. Improved stability for general performance Changes to V1.03 Optimized performance when attaching new lens HD PENTAX-DA*11-18mmF2.8ED DC AW. Changes to V1.02 Improved stability for general performance.