I've got several scenarios that I use.? One is that I need to have a field of view big enough to handle a 20x20 144 pin TQFP. That's needed to center and sit on pins.
Secondly, I need as much of a closeup as possible needed for each individual (or group of 5) pins.? Intermediate settings do individual parts.
You do want the closeup if at all possible to look for shorts (don't ask).
Ring lights are very very good, and I'd recommend them.? Mine's fiber optics and I use an auxiliary side light.? I'll have to get an LED replacement when the bulb goes or find another bulb (may be easy).? Using it on the lowest setting gives me the proverbial immortal light bulb (a good thing).
Mine are american optical made, quite used.? A boom stand is an excellent idea if you can find one.
That, and the metcal tips (oddly enough, the finest tip is not all that useful), do well.
I'm busy putting together PC boards and writing (rewriting) low level graphics drivers at the moment.
Harvey
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On 11/1/2019 9:17 AM, Dave wrote:
Hi Harvey, how's it going? I have done a crash course yesterday and learned from my early findings that I need distance to work with plenty of access. And that a 0.5 objective lens for a wider view is a good thing to have. I will be searching for a while but not too long. I don't want to have to buy this thing twice after making the wrong decision first.
Thanks,
Dave
On 10/31/2019 8:28 PM, Harvey White wrote:
I do.? An old american optical, 5 different powers, boom stand. Old fashioned fiber optics light (bulb set on low).
Make sure that if you buy one used, that it's not made for chip examination, and that the working distance between the work and the lens is fairly large.? Chip microscopes have almost no working distance.
You'll want a good fan as well.
As for the "hold your head just right, mine doesn't seem to have that problem.
Harvey
