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Minelab Excalibur & Sovereign Forum


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The Detech SEF 18x15, 15x12, & 12x10 All In Picture Together For Size Comparison. & Info On Uses For Them & 21x17
Posted by: Critterhunter
Date: July 28, 2012 10:03AM
The first pic shows the 18x15, 15x12, and 12x10 all together in one pic. The second pic is Mathias's already posted 18x15 and 12x10 together. We are only missing the 21x17 in a picture with the others or at least beside one or two of them so people can judge the size of that coil. As you can see, the 15x12 is a pretty darn big coil but borderlines being a monster to some, while the 18x15 easily fits "monster" class to anybody, but for sure the 21x17 is Godzilla in terms of size. :biggrin:

The 12x10 without coil cover is lighter than the super light Sun Ray S-12. The 15x12 without coil cover is lighter than the 10" Tornado with coil cover still on. I owned this coil for a while (15x12) and it's size doesn't feel that huge once you get used to it. For sure it helps to cover a large beach or field faster due to the slow swinging nature of Minelabs. However, while it did seem to show more depth than the 10" Tornado for me in the sand on coin sized targets, it seemed to get less depth on land in my soil on coin/ring sized targets. The 12x10 seems by all tests and use to be deeper for me than the 10" Tornado and 15x12 on land, so I would suspect it might be even deeper than the 15x12 in the sand but haven't used it enough there yet to judge that for sure. The 12x10 is still a nice improvement in coverage over the stock 10" coil. I feel less likely that I'm missing spots when gridding with it, and it is noticeably an improvement in coverage when covering large areas, yet due to it's super sharp detection field I feel I'm separating much better left/right wise than the stock 10" coil. When I go back to the stock 10" coil (rarely) it feels tiny to me now, like I'm using an 8" coil or something.

Some say the 15x12 is giving them gains in depth over the 12x10 on dime sized targets, while others like me say the 12x10 is deeper in our soil on dime sized targets. I believe it falls down to how mineralized your soil is, and that for some of us the 15x12 is taking in too much ground matrix and degrading a target at extreme depth. For sure the official field test of all three of these coils (18x15, 15x12, 12x10) shows that the 15x12 gets less depth than the 12x10 on a cut quarter penny (a tiny European coin). As the field test shows, the 15x12 will get deeper on say a target the size of a half dollar or bigger or so. For these reasons the 15x12 is somewhat a 50/50 proposition as to if it may or may not get deeper for you on say dimes or quarters than the 12x10. Some say yes, some say no.

For sure most would probably agree that the 18x15 is well beyond the point of no return in terms of providing more depth on at least dimes or quarters over the 15x12 and 12x10, but I bet will see larger targets about the size of a silver dollar (maybe even a half dollar?) or perhaps a bit bigger than that at greater depths than the 15x12 or 12x10. For that reason the 18x15 might be a good choice for cache hunting to some. But, if you want a coil that also should get decent depth on dime/quarter sized targets and yet some deeper cache ability I'd lean towards the 15x12.

On the other hand, the 18x15 might not get as deep on coins or rings as the other two smaller coils, but in some situations such as miles of beach it's more important to some to get maximum coverage to cover areas faster and not so much as important to get maximum depth. That might make it a good choice for miles of beach hunting or super large open fields when depth is of secondary importance and coverage is primary. I still found the 15x12 to be a really good step up in coverage, though, and like I said it's lighter than the stock 10" Tornado with coil cover if you remove the coil cover on the 15x12.

As to the decision to go for the 12x10 or the 15x12 for coin/ring sized targets, as said some of us believe the 12x10 is deeper on those in our soil, while others say the reverse, or at least that the 15x12 matches the 12x10 on those sized targets (probably a better way to put it). Ask yourself if you just want max depth on rings/coins and then the 12x10 is the safer bet I would think, as the 15x12 probably will only match it on those size targets and might (as it was for me) not get the same depth in certain soils due to the ground matrix degrading target signals at depth IMO. I would weigh this question too...Is coverage more of primary concern with probably near matching depths? Then lean towards the 15x12 maybe. If it tells you anything, though, by far the 12x10 is more popular among coin and beach hunters. That should tell you something, and as said the added coverage over the stock 10" coil is still noticeable and a nice improvement, without feeling you are using too big of a coil that won't separate as well as the stock 10" coil. You'll probably find, like me, that the 12x10 gives you even more confidence you are separating better than the stock coil in fact left/right wise.

Here's the official field test of the 18x15, 15x12, and 12x10, which gives data on the depth of each on various sized targets and such which should be helpful. It's just a PDF file of the article and not a website trying to sell anything, so I don't see any issues with posting it.

http://www.lovecpokladu.cz/img/sefcoils.pdf

Here's the pics (18x15, 15x12, 12x10 in first pic, Matthias's pic of 18x15 and 12x10 in second)...



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Edited 6 time(s). Last edit at 07/28/2012 10:24AM by Critterhunter.





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