Originally posted by ignatowski For the partials I used the "Baader AstroSolar Visual Solar Filter Film (ND 5)".
The 1.4x and 1.7x were both pentax brand. I had the 1.4x closest to the camera, then 1.7x, then da* 300mm. For focusing I used the live view magnification and aimed for the sunspots. It was very finicky and took several attempts to get it perfect. After that I taped it down which held up for the duration of the eclipse. I also used the electronic shutter which might have helped with sharpness.
ignatowski,
Thank you for answering my questions.
For the partials I used the "Baader AstroSolar Visual Solar Filter Film (ND 5)".
unp : I used exactly the same product on my cameras!
The 1.4x and 1.7x were both pentax brand. I had the 1.4x closest to the camera, then 1.7x, then da* 300mm.
unp : Great to know, I never thought about combining 2 teleconverters! I did many trial runs days before the eclipse and tried many different options. I used a Tamron 1.4 TC (which has a very good reputation) on my F* 300 during my trials. Realized that I was losing some sharpness with my 1.4 TC so took all my eclipse pictures without the teleconverter. I believe the Pentax TCs are better than Tamron TCs.
For focusing I used the live view magnification and aimed for the sunspots. It was very finicky and took several attempts to get it perfect. After that I taped it down which held up for the duration of the eclipse. I also used the electronic shutter which might have helped with sharpness.
unp : Nice techniques, will sure try these techniques.
Thanks,
unp