Compensating exposure for R25a... im confused

[robmster]

Im shooting with a konica hexar, and I developed and scanned the first rolls and all the picture were quite underexposed. I didnt realize that the hexar had a non ttl meter and I was using an R25a filter. How do I compensate the exposure. some say I should compensate by 3 stops so if I use iso 400 film I set the iso in camera to iso 100? Is that correct? It seems like a lot to me.

 

[onre]

For three stops, you need to set it to ISO 50. ISO 200 would be one stop, ISO 100 two stops etc. The amount of compensation is not a lot really, two or three stops are normal for red filters.

 

[robmster]

For three stops, you need to set it to ISO 50. ISO 200 would be one stop, ISO 100 two stops etc. The amount of compensation is not a lot really, two or three stops are normal for red filters.

Oh okay thank you. Is there anything I need to change with development when Im shooting this way?

 

[onre]

No.