Gossen Luna-Pro S problem?

[richard_wrede]

<p>On the Luna-Pro S dial, there is a ring you can set for correcting exposure. For example, if you are using a filter that has a "x4" correction on it so you can set this ring to "4" on the LV correction scale and ..."it will automatically correct for the filter"....<br>

mine only seems to work if you first take a reading, set the dial as normal, then adjust that ring to 4 but subsequent readings aren't automatically corrected as the instructions indicate... see my samples below<br>

If I first take a reading, set as normal then adjust the compensation ring, then yes, it works fine but I was told by another forum user that is not how it is supposed to work and there may be something wrong with my dial?<br>

As you can see. I took a standard reading of my work area, a reading of 14, at ASA-100 gives a reading of 1/125 at f/2. If I move the ring to '4' (or -2ev) and take a reading again at 14, it is still at 1/125 at f/2.<br>

Can someone explain what I am doing wrong? better yet, if you have a meter like this that works as it should could you post a before and after images?<br>

PS. I have read the manual and it says presetting the dial will "automatically adjust for exposure" each and every time.<br>

<br>

<br>

Regular setting:<br /> <img src="https://farm8.staticflickr.com/7496/15740173348_39ab497006_z.jpg" alt="" /></p>

<p>Compensated setting:<br /> <img src="https://farm9.staticflickr.com/8660/15740173288_8f5f6d98ab_z.jpg" alt="" /><br>

I posted this before but I believe it was not in the correct subject/category </p>

[rodeo_joe1]

<p>There is no interlink between the reading and the "compensation" dial. In other words, given the same lighting, the needle will deflect by the same amount regardless of the position of the outer ring. It's just a manual calculator and does nothing to the meter electronics.</p>

<p>The ring should move the shutter speed dial. But it doesn't look as if that's happening on you meter.</p>

<p> </p>

[richard_wrede]

<p>Thanks, I'm aware it has no effect on the electronics and yes my shutter speed dial does move with the ring (note the tick is between 4 and 2 in both shots) I thought maybe the yellow 'transfer scale' band was supposed to stay stationary as the shutter band moved but looking with a magnifying glass they are one in the same, just painted yellow...</p>

[BrianS1664879711]

<p>Something definitely looks wrong with the calculator dial. It doesn't appear to be doing the offset for your EV compensation setting. For a -2 compensation at LV14 (yellow bar) the EV (Zone V) should read EV 11 if the EV for uncompensated LV14 is EV 9.</p>

[richard_wrede]

You would think but the yellow

scale ring and the EV ring are

one in the same, just painted

yellow on the EV ring. I've

looked every where for an image

of "one in action"

[BrianS1664879711]

<p>Well something has to move to give the exposure compensation you dialed in. From your pictures there was nothing that changed on the exposure calcualtor. That can't be.</p>

<p>I've never really had to think too hard about which scales are connected to which, but the ring that you moved from 0 to -2 has to change SOMETHING... and it doesn't seem to do so.</p>

<p>I don't have a Luna Pro S, just a plain old Luna Pro. Yesterday I was almost envious about your ability to do a filter factor correction... but not today. I'll continue to be satisfied with changing ASA to do that kind of compensation.</p>

<p>Hope you get it figured out soon.</p>

[richard_wrede]

It changes alright, you must

first take the reading, set as

normal, then move the

compensation ring, that is the

only way it works (I haven't

shown a picture after that) but its supposed to work every time without resetting it

[richard_wrede]

It's A beautiful meter, almost mint. I can live with or

without the compensation ring but I just like to know

what makes things tick... or not tick.. LOL

[jack_fisher1]

<p>Richard,<br>

I have a Luna-Pro F. It has similar function scales as the S model. When I push the tab to move the compensation pointer dial, as you illustrated, a plate moves behind the f/stop plate. The plate that moves has the "TIME" scale, the EV Number Scale, and the Cine Scale. All of these (including the little pointer for the Zone number scale) should move when you move the compensation ring off its "Home" (red mark) position. If that plate having the shutter speeds and EV numbers doesn't move when you move the ring, I suspect a link may be broken.<br>

That is how my Luna-Pro F works.<br>

Jack</p>

[rodeo_joe1]

<p>I'm with Jack. The compensator ring simply moves the shutter speed dial around (or should). It's obviously not doing that on your meter Richard, since the shutter speed scale has stayed in the same place - indicating 1/60th @ f/2.8 in both pictures.</p>

<p>I'm not sure how it can have worked before you took a reading and not afterwards. That just doesn't make any sense at all.</p>

[richard_wrede]

<p>Here is my meter after making a correction, EV changed from 9 to 7 and the f/2 is now on 1/30 second. It does work but bare in mind I have to first set as normal, THEN I make the correction and it comes out fine. Note the yellow index ring changed from 14 to 12, it should have stayed as 14.. so, by leaving the compensation ring like this, the next time I take a measurement and set it, it is actually normal (like my second image above) There is only one band that moves when I set my ring.. the yellow index band should stay stationary when I set the ring but it doesn't, it cant, it is merely painted onto the EV scale ring.<br>

<img src="https://farm8.staticflickr.com/7472/15922878976_7a8f7fd315_z.jpg" alt="" width="640" height="480" /></p>

[richard_wrede]

<p>Jack, my meter does as yours does, Time and EV disc move when setting the ring but I have the yellow index scale to set by, whereas you have the NULL meter where you turn the dial until it zero's. If my yellow index scale stayed stationary as I set the ring it would be fine.</p>

[christian_irgens]

<p>I think there are a few things wrong here. My memory is that Ektachrome 64 (as well as the late and lamented Kodachrome 64; "Mama don't take my Kodachrome away") had a sunshine EV of 14. Going into the closet where a lot of old Hasselblad V system equipment spends its time in deep hibernation, I dug out a Sonnar 150 from 1972. Checking the EV scale at 14 gives f/16 at 1/60 second which of course is the old Sunny 16 rule. Now, I have never had a Luna Pro (S, or otherwise) but I remember working with at least one European multi-ring meter.</p>

<p>Let us for a moment disregard the ISO setting of 100 and just stick to EV 14. On the meter we see f/1.4 at 1/60, which is of course patently wrong. Never having had much use for the Zone System I am about to go out on thin ice here, but it seems to me that you should have your EV reading, here 14, opposite Zone V, the ever so famous 18% middle grey. As it is Zone V is overexposed by 5 stops, which isn't in and of itself wrong <strong>IF</strong> you are trying to get some density (on the negative) at Zone 0, except that Mr. Adams never saw fit to have a Zone 0. If you put Zone V at the meter's reading of EV 14 you do of course get the correct exposure, unless you have a predominantly dark subject and you are attempting to expose way to the right on the histogram. Assuming that this is not the case and we can go with the indicated exposure, we can then go down minus 2 EV to adjust for the filter factor. I obviously don't know whether the outer ring rotates, or not, but by leaving the 0 at the corrected indicated exposure, you can read the exposure adjusted for the filter factor under the -2 point.</p>

<p>As I said earlier I know neither the meter nor the Zone System, but the above is the only way I can make sense of the original question. Hope I haven't muddied the waters too badly, and also please excuse me for being somewhat late to the party.</p>

<p>Chris</p>

[rodeo_joe1]

<p>Christian, the yellow dial on Gossen meters isn't a direct EV reading. It's an arbitrary scale that's indicated by the meter needle. It's only when you set the dial to the indicated scale number (and ISO speed in use) that you get an EV number. You can see the EV number indicated on the black & white "Zone" section of the meter. In the picture immediately above, the arbitrary yellow scale reading is 12 and the corresponding EV is 7, which is correctly shown as 1/30th @ f/2, etc.</p>

<p>We won't even go into the discrepancy between Ansel Adams' allocation of Zone V as being 18% reflectance, when simple maths and sensitometry theory shows it can't possibly be more than 12.5%.</p>