valdas
Veteran
If I am not mistake Efke 50 (35/120- KB and R) has somewhat reduced spectral sensitivity to red. So, I was wondering if I can use orange filter with this film. Any real life experience (what exposure compensation is needed?)?
charjohncarter
Veteran
I have only used Efke r25 (also Efke 820 IR but that is a different story). And I didn't use any filters. These were my results:
https://www.flickr.com/search/?user_id=8178676@N04&sort=date-taken-desc&text=efker25&view_all=1
The people below on Photonet have some help for your problem:
https://www.photo.net/discuss/threads/efke-iso-25-film-spectral-sensitivity-change.18795/
https://www.flickr.com/search/?user_id=8178676@N04&sort=date-taken-desc&text=efker25&view_all=1
The people below on Photonet have some help for your problem:
https://www.photo.net/discuss/threads/efke-iso-25-film-spectral-sensitivity-change.18795/
Skiff
Well-known
Of course you can use an orange filter.
The exposure compensation is dependent on the filter factor. Look what filter factor your orange filter has. Or use a SLR, the through-the-lens metering is considering / including the filter factor.
valdas
Veteran
The reason I asked is that, I understand, fully ortho film (with no red sensitivity) makes red and orange filters impossible or compensation should be much more than normally (e.g for panchromatic film).
valdas
Veteran
yes, I have read this, and this triggered my hesitation- I guess red could be too much of the risk (or need to experiment with the exposure), but not sure about orange... yellow is safe, I assume...
Skiff
Well-known
R25 is not a fully ortho film. Therefore you can use an orange filter.
valdas
Veteran
I realize it's not fully ortho, but still - reduced sensitivity to red specter and reported issues with red filter, so I was wondering in there is more adjustment needed with orange. I guess I'll need to test it...
