B+W 092 vs Hoya RM72...

[walter23]

I've seen these both listed as being a wratten #89B equivalent... is this true? Why is the B+W cheaper than the hoya?

I need a filter to get a nice IR effect with Ekfe IR820. I'm running low on kodak HIE sheets

 

[Helen B]

From (there was a url link here which no longer exists)

"Here, to the best of my knowledge, are the 50% transmission wavelengths for some common filters, to the nearest 5 nm. Heliopan filters are given their Schott RG numbers, which correspond to the 50% transmission wavelength.

Wratten # 25 (Old designation: A): 600 nm
Wratten # 29 (Old designation: F): 620 nm
B+W 091 (Schott RG630): 630 nm
B+W 092 (Schott RG695): 695 nm
Wratten # 89B: 715 nm
Hoya R72: 720 nm
Wratten # 88A: 745 nm
Wratten # 87: 795 nm
B+W 093 (Schott RG830): 830 nm
Wratten 87C: 850 nm

All Wratten data from Kodak Photographic Filters Handbook, B-3, 1992

The B+W Handbook gives the Schott glass used for each filter. The Schott website gives complete spectral data, but it isn't really necessary for obtaining the 50% transmission values."

From that information the 89B is similar to the R72, but the 092 is not. This corresponds with my experience with the R72 and the 092.

Best,
Helen

 

[walter23]

Ahh, great. This corroborates what I've now heard and read elsewhere.

 

[Rui.Cardoso]

Hello,

I used, the B+W 092 with the old Maco IR 820c with good IR effects.

When the Maco was replaced by Rollei IR, I tryed this film with the B+W 092, and because I could not get a strong effect with this combo I tried both the Hoya R72 and the Heliopan RG715, my findings where that the Hoya was the stronger of the three, (1 to two stops slower than the B+W, with the Heliopan RG715 somewhere in the middle).

I only shot one test roll with the Efke IR820 to date, and surprisingly I do not see big differences from the three filters at the same ISO ratings: I got a very good IR effect between ISO 6 and 3 with any of the filters (quite similar to the looks of the old Maco)...

I'll be boing some more tests during the next weeks, so I'll let you know if I find something different from this.

Regarding the price differences, I also do not understand them. The Hoya is pretty much inexpensive up to 67mm (the one I use), over this the price gets completely insane. In terms of build the B+W and the Heliopan are equally excellent, the Hoya does not look as solid, but I still didn't have problems with any of them.

Regards,

-Rui

 

[Tom Stanworth]

all thing being equal, I cannot recommend enought the MRC B&W filters; they really are superbly made and have a great coating. I guess the wavelength transmission might be your primary concern. I have some MC hoyas too, but after the B&Ws...that is all I will not buy in glass circular filters. Superb.

 

[Helen B]

Tom,

Have you been able to get MRC versions of the 092 or 093? If so, wheere from?

Thanks,
Helen