A comparison of three colour meters
Just in case anyone is wondering which colour meter to choose:
When Minolta stopped production of the Color Meter IIIF I began to be asked about how the Minolta IIIF compared to the Gossen Color-Pro 3F. I had no experience of the Gossen, so decided to get one and find out. That meant that I had three colour meters: the Minolta II (MII for short) and IIIF (MIIIF for short), and the Gossen (G3F for short). I've never seen a comparison of the three, so thought that it might be worth making a few notes.
eBay prices: about $300 or less for the MII, and about $800 for the MIIIF and G3F.
The MII is the most basic of the three meters. It only measures continuous light in its standard form. A separate flash receptor is available. I don't have one of those, so can't comment on it. I'd be grateful if someone else added their experience of it.
The head is removable, and can be located remotely from the body of the meter with a ribbon cable. I have one of those, but have never found any reason to use it. There's a standard 1/4" tripod thread on the head, so you could put it on a pole to get extra reach while holding and reading the meter body. The head does not rotate, unlike the other two meters. I've never found that to be important. Mine can read in slightly lower light levels than the other two. It has three preset film types; daylight 5500 K, Type A 3400 K and Type B 3200 K. There's also a variable setting.
It takes a 9 V battery, and the blade contacts are built into the side of the battery compartment. This is a robust, quick system - I wish that all PP3 connectors were that good.
It displays colour temperature, reciprocal megakelvin (MKˉ╣ = mired) shift and a green-magenta index. There's a table on the back to convert from mired to Wratten filter numbers, and from the G-M index to CC-G and CC-M filters. For example an index of +8 corresponds to CC20M and an index of -7 corresponds to CC20G. The index display resolution is 1, so this means that you can estimate the reading to better than the nearest 2 CC units. In practice that is a reasonable expectation for the accuracy of this meter: plenty good enough.
I'll cover the other two meters feature by feature.
Batteries: The MIIIF takes two AA cells. Simple. The G3F takes a 9 V battery
but has one of those flimsy connector pads on a thin bit of wire. Gossen could do better.
Range: The G3F comes with two flat receptors [colour meters always have flat (cosine) receptors instead of the domed (cardioid) type usually found on light meters]. One receptor has a semi-silvered mirror that decreases the sensitivity by five stops. Lose the attenuating receptor and it will cost $125 to replace. Lose the normal one and it will cost you $24 to replace. The MIIIF has a range switch.
Flash: they both have good flash/continuous functions, and a sync socket. The G3F will give the flash output in lux-seconds, and the gate time is adjustable.
Display: they display similar information. MKˉ╣ shift, Wratten filter, CC adjustment. The G3F gives lux as well. But here's the thing: the G3F only gives the CC adjustment in steps of five, while the MIIIF gives it in steps of one. No big deal, because who carries CC filters in steps of less than five? I carry them in steps of ten when I'm travelling light. If I get a reading of five, what do I do? In fact it doesn't lead to a significant average error, but the MIIIF has a definite advantage. Even if the absolute accuracy of the two meters is similar, the extra resolution of the MIIIF can give it an advantage.
Size: the G3F is the smallest of the three. The MIIIF is slightly smaller than the MII.
I hope that gives a general idea of the differences between the meters. If there is anything specific that you would like to know, just ask. In case you haven't guessed, I think that the MII is great value if you don't need the extra functions of the other two.
Last edited by Helen B; 01-24-2007 at 08:12 PM. Click to view previous post history.
Thanks for the review. One quick question comes to mind, probably in the manual, but I'll ask here for other readers of the thread. Does the G3F have a storage compartment or other place to securely attach the unused second receptor? Just thinking about how this might lessen the chance of losing it.
I own the flash attachment for the MII. Works just as well with flash as the standard head does with ambient.
Yes the MII is bigger, especially with the added flash head, but never saw the need to upgrade since I so rarely use them.
One thing I do is always remove the 9v battery when not in use.
A clarification please (?) : the MII does read ambient as well as flash, right?
The MII reads ambient, and with the additional flash head will read strobe.
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Originally Posted by Lee L
The soft nylon case has a little pouch for the unused receptor disk.
Helen - so if you didn't have a color meter yet, which one you you buy?
Originally Posted by Helen B
BTW, I picked up a Minolta Colormeter II last year for under $100. It does all I need, except flash would be nice. So someday I'll try to get the other head.
Also - do you get the same readings with all 3 meters in various lighting situations? Does one seem more accurate that the others?
Hmmm...Thanks for the review. Since I don't typically rent strobe equipment and have tested my own strobes with film, I suspect I could get by with a color meter that only read ambient, or do you find that strobe color varies with output? Do you find a lot of variation between brands of studio strobes?
I'd buy a Minolta - either the II or the IIIF, depending on how important the extra flash functions were. Personally, I'd be happy with the II. If you know from experience how your flash equipment compares with daylight, you only need a continuous meter to balance flash and continuous - only the continuous is unknown. I know what I'm trying to say, but I'm not saying it very well.
Accuracy etc: The short answer is that the three meters are remarkably close. I'll go into more detail in a minute.
I've never felt the need to use a colour meter to balance strobe to strobe, but I don't have enough experience with different brands of strobes. My only use of a colour meter with strobe is to balance to ambient, in which case you can usually manage without measuring the strobe itself. I think that my situation is very similar to yours. Perhaps someone with more experience with colour meters and strobes could answer that one.
Back to accuracy.
I think that colour meters are fairly consistent, especially between 5500 K and 3000 K. My MII drifts a bit below 3000 K, but it is old. The maximum difference between any of them is about 12 mireds in the 2300 K to 2600 K region. That's not a big difference in practice. The green-magenta index is comparable as well, although the fact that the Gossen reads in steps of five does lead to differences. My MII consistently reads -2 for blackbody sources, but if I take that into account it compares well with the MIIIF.
When you think about how the readings from a colour meter will be used, the differences between the meter readings look unimportant. If you are balancing sources to each other then absolute accuracy isn't necessary, of course. All the meters show good precision, equalling the resolution of their displays.
For balancing a source to a film type accuracy is more important, but I haven't noticed enough discrepancy for it to be a problem.
Here's a summary of the nominal shift values of the least dense standard filters.
Eighth CTO, CTS: +20 mireds
Eighth CTB: -12 mireds
Eighth plusgreen: CC 3.5 G (CC035G)
Eighth minusgreen: CC 3.5 M (CC035M)
Wratten 81: +9 mireds
Wratten 82: -10 mireds
KR 1.5: +15 mireds
KB 1.5: -15 mireds
CC green: CC 2.5 G (CC025G)
CC magenta: CC 2.5 M (CC025M)
(I don't have the need to use camera CC filters in 2.5 unit steps)
Those values should give some perspective on the degree of accuracy (or lack of it) required from the meter. I think that all the meters I've used have been sufficiently accurate.