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Rezensionen (13)
08. Sep 2020
Somewhat better than the original version. But way more expensive used.
The PR570 is (essentially) a PR57 with a digital faceplate and the digital smarts that go with the faceplate.
When you pop open the hood the essentials are virtually identical:
1) Isolation transformer
2) Variac coil on the secondary
But where the PR 57 uses a single analog meter (with switchable functions), the PR570 has a pair of liquid crystal digital displays. Neither of these are backlit. You may wish to consider this within the context of the lighting of your bench.
One feature I do appreciate in the 570 over the 57 is the current limit setting. To be accurate, it's a current trip, not a limiter like a series light bulb. However, the PR57 has just two current settings whereas the PR570 is continuously adjustable and the accuracy/granularity is excellent.
The PR570 is roughly the same size as the PR57. So it will physically replace your 57 neatly without taking up additional footprint.
But here's the downside:
In terms of providing fundamental protections, the PR570 is only marginally better than a PR57, yet (used) the PR570 runs between two to four times the price of used PR57s. I literally waited years for this one. I bid on a dozen auctions and lost them all because I refused to pay more for a PR570 when PR57s are almost as good for a much better price. I got lucky this time and am happy with the purchase, mostly because of the adjustable current trip. But the darkness of the LCD meters is irritating.
25. Aug 2020
Older technology for older technology instrumentation... but with a modern technology pricetag
If we had the Fluke 725 back in the 1970s when I began calibrating 4-20ma instruments, it would have been better than anything (then) on the market, such as Transmation's famous line of field calibrators.
But times have changed and much of today's instrumentation has gone "Hart" digital, which the 725 cannot do.
Of course, many plants and industrial facilities still have a lot of old-technology analog transmitters in place. And the 725 (being two meters in one) is certainly convenient when calibrating or troubleshooting circuits. But modern control systems sometime require higher accuracy than the 725 can deliver and their model 754 is better-suited for commercial and industrial application then the outdated 725. The 754 has both Hart support and an extra digit of precision.
I cannot speak to the 754... but the 725 does come in an "intrinsically safe" version (red case) for use in potentially explosive atmospheres, such as around aviation/rail fueling stations or solvent/petroleum refineries. The yellow-case 725 is not certified by Factory Mutual for use in such environments.
05. Jul 2016
KIWI FK-140 Foot For Nikon Telephoto Lenses
For the record, this foot is made by Kiwifotos, Model KF-140. It works on Nikon's 200-400mm f/4 G VR as well as Nikon's 500mm G VR.
Solid construction with extra reinforcement in the "ankle" area which is where the bending moment is most concentrated. I've been obtaining very sharp images, which is the measure of a tripod foot. The anodizing is professional and is superior to a painted finish because anodizing (when done properly) won't rub off when this foot is slid into/out of an Arca/Swiss style mount..
The parts kit is complete with everything necessary to completely replace Nikon's standard foot.
If there is any "fault" with this foot it is that it lacks a 3/8-16 UNC tapped hole. Instead, there are three 1/4-20 tapped holes, spaced along the length which can actually be more useful to someone fastening a sports strap, such as the BlackRapid. More about this at the bottom of this review.
The Hejnar brand H105 foot is quite similar to this Kiwi model. THe Hejnar has one 1/4-20 tapped hole plus one 3/8-16 tapped hole. The Really Right Stuff LCF-14 or LCF-16 (both more than double the price) also have one tapped hole of each size.
If you're going to use this on an Arca/Swiss tripod head exclusively, then the Hejnar might be a better solution. However, the Hejnar is not comfortable for hand-holding whereas this Kiwi has a very comfy rounded contour on the inner surface which cradles the palm perfectly. I have carried Nikon's 500mm F/4 with the Kiwi for up to three hours at a time it's that comfortable. RRS's LCF-14 and LCF-16 also have a nicely-contoured inner surface for hand-holding.
If you intend to hand-hold your 200-400 or 500mm telephotos, then you'll need a foot with extended height like this one. However, there are "low profile" Arca/Swiss feet available that are a bit more resistive to mirror slap and shutter vibration if you're always going to sit your telephoto on a tripod, be it a gimbal, a ball-head, gear-head or video head.
Getting back to the tapped hole patterns... It turns out that the Kiwi product is better if your aim is to hand-hold for the following reason:
You're going to use a sling-style (also-called "sports style") shoulder strap to secure the heavy telephoto during your hike into and out of the woods (or wherever your "prey" is located). But you'll be grabbing the lens to flip it up for shooting on a moment's notice because birds and animals are so unpredictable. Well with the Really Right Stuff and Hejnar feet, you have no choice but to affix the shoulder strap to the middle of the foot, meaning that when you tip your lens up and grab the foot with your left hand, your left palm will be grabbing the 1/4-20 screw and locknut rather than the smoother surface of the foot itself. With the Kiwi model, I can attach the strap to the foot using one of the two alternative 1/4-20 tapped holes, leaving ample space on the foot itself for the palm of my left hand to rest. Do not under-appreciate this comfort because it means that the purchase by your left hand will be much firmer, allowing more control of such heavy glass.
The $45 price is roughly half that of the RRS alternative. In no way is the Kiwi a less-robust product. I've had two weeks of experience now and would absolutely select the Kiwi over the RRS and Hejnar alternatives regardless of the price difference because of the Kiwi's superiority for hand-holding.