morgan_bellinger

<p>So when I posted this, I hadn't realized that the extension tubes don't have any sort of focus coupling to the rangefinder mechanism in the body of the camera. Thus, the only way to focus when extension tubes are installed is via ground glass or the tape measure-vs-distance scale method. I should have realized this before asking, sorry!<br>

However, I'm wondering if it's possible to achieve a shorter focusing distance with the spacers that fit between the back and the camera body.<br>

<br />Were those spacers only designed to be used in conjunction with the extension rings? Or will they work on their own? Seems like it shouldn't matter where the extra space between lens and film plane comes in relative to the body (focusing mechanism) but I want to make sure I'm not overlooking something. Thanks in advance!</p>

<p>I love shooting Polaroids with my Mamiya Universal, and that's what I primarily use it for.<br /> However, I have always been frustrated at the minimum focusing distance for this camera. If it only went a foot or two closer, it would be enormously more useful to me.<br /> It occurred to me that a sensible solution might be to add the smallest extension tube. However, it seems like this only works with a ground glass back - quite incompatible with the handheld photos that I'm hoping to take with this configuration.<br /> I recently purchased a spare Mamiya Universal camera body, and I'm wondering if I could just recalibrate the rangefinder with the extension tube installed, leave the tube permanently on the spare body, and just switch to that camera body whenever I wanted to take closer pictures. This led to a few questions - I'm hoping that some of you who are more experienced with the Mamiya Press line may have answers or suggestions:<br /> a) Is such an adjustment even possible within the adjustment limits of the rangefinder mechanism?<br /> b) Would the same adjustment work for all of my lenses?<br /> c) What's the difference between the extension tubes (between lens and body) and the extension boxes (between back and body) and is there one that would be preferable for this procedure? Do I have to use both?<br /> <br />Thanks so much in advance!</p>

<p>I just bought a Mamiya-Sekor 150mm f/5.6 lens for use with my Mamiya Universal Press camera. I have used a number of different camera systems and never had any trouble deciphering their function after a few minutes of experimenting or reading the manual. But with this lens, I really can't seem to figure out how to change the aperture. There's a metal arrow that indicates the selected aperture value, but I can't find a ring or setting that will change it, and the metal arrow doesn't want to budge (and I don't want to force it). My 100mm f/3.5 has a tab that you push to choose the aperture; this lens does not. There is a black version of this lens that looks very similar to my 100mm f/3.5; this is not it.</p>

<p>Does anybody have any idea how to adjust this? Thanks so much for your time!</p>

<p><img src="http://i41.tinypic.com/9rsq47.jpg" alt="" width="768" height="1024" /></p>

<p>I have a puzzling problem with my 580EX II.<br>

I put in my new, freshly charged PowerGenix NiZn batteries the other day, mid-wedding. Fired off a few full power bounce shots (around 5 or 6) and now I have a flash that's not working right.<br>

I put in freshly charged NiMh batteries (tested in my other 580EX II) and power on the flash. I get a green pilot light after a couple of seconds in ETTL mode, and am able to fire the flash a couple of times using the pilot button. Then it takes around 8 or 9 seconds to recharge.<br>

If I put it in M mode, I get a green pilot light only if I turn the power down to 1/4 or below. The second I turn it to 1/4 + 0.3, I lose the green pilot light. I can fire the flash at 1/4, and it looks like 1/4 power, but it takes longer than normal to recycle.<br>

I have tested it with multiple sets of batteries and always get the same result.<br>

Any suggestions? I'm considering sending it in to CPS. Should I take it apart myself to look for broken components? Should I bother with CPS? Too expensive? Or should I just ship it to them and let them diagnose it, then get it fixed elsewhere?<br>

The flash is out of warranty.<br>

Thank you so much for your help. It's been very difficult to find help with such a specific problem.</p>