Classical Numismatics Discussion
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 1 
 on: Today at 04:14:30 am 
Started by dougsmit - Last post by dougsmit
1. Sharpening is best applied last after cropping and all other postprocessing so I don't use it in the RAW conversion step but only at the end.

2.  Smaller apertures (larger f/ numbers like f/16) give more depth of field than wider ones (like f/8) which can be good shooting high relief coins BUT they increase an aberration called diffraction so there is a place in the middle that gives best results.  This differs according to sensor size and amount you will be enlarging the image.  With my full frame DSLR, I shoot at f/9 or f/11 but suspect your crop camera might be better at f/8 or f/9.  Many point and shoot cameras are diffraction limited at full aperture because of their tiny sensors.  The differences here are gradual and may not show up much unless you make huge prints.  There is always the fact that most of our coins add their own unsharpness so we might not see differences on coins lacking fine detail.  All this assumes your tripod/copy stand is rock solid and you are using a remote release or self timer to take the shot.  Vibrations are worse than diffraction.  At some point you may be tempted to have a 20x30" print made of a super sharp coin just to prove you can but for selling coins online, all this is moot.

http://www.cambridgeincolour.com/tutorials/diffraction-photography.htm
The above will tell more than most people want to know.  It has a utility where you input the variables and it calculates whether you are diffraction limited for a specific camera and aperture.  Your camera is a 1.6x crop model and should match other Canons of that group.   

I will be in and out a lot this week and next so may be very slow at replying to questions.

 2 
 on: Today at 04:00:53 am 
Started by Canaan - Last post by Canaan
Hello to all, any help is appreciated regarding this seal, it is 16.88 grams, 35mm max. Length and 30mm max.diameter

 3 
 on: Today at 03:17:56 am 
Started by Joshua G - Last post by Joe Sermarini
Welcome to the discussion Joshua G. We ask that when you post a coin for opinion here you also include the weight and diameter, and why you suspect it is fake? 

 4 
 on: Today at 01:59:56 am 
Started by zoser - Last post by Oleg D2
Check out this

https://www.acsearch.info/search.html?id=1687591

 5 
 on: Today at 12:34:33 am 
Started by XLi - Last post by nikopolis1
ring is XIV-XV A.D Generally this type of rings are common in Bulgaria and Serbia

 6 
 on: Yesterday at 09:53:40 pm 
Started by Marsha - Last post by Kurt E
Irripo similar to this.

https://www.acsearch.info/search.html?id=464545

Kurt

 7 
 on: Yesterday at 09:14:45 pm 
Started by David Atherton - Last post by peterpil19
The portrait is amazingly life-like!

Thanks for sharing,

Peter

 8 
 on: Yesterday at 08:56:23 pm 
Started by Joshua G - Last post by Joshua G

 9 
 on: Yesterday at 08:34:22 pm 
Started by Din X - Last post by peterpil19
I guess that no one will be participating so this will never happen.

One way to be certain they will happen is to start them yourself. Smiley


Hi Din X,

Thank you very much for your detailed explanations above.

I believe threads on the subjects you have suggested would be most informative and useful on this Fakes Board - especially if stickied.  Even if there are only a few examples in each thread and occasionally contributed to, I still think they will be useful to those coming to this Board for answers.

Peter

 10 
 on: Yesterday at 08:22:21 pm 
Started by bpmurphy - Last post by peterpil19
If their goal is simply to get people's attention, it worked.

But if they're out to actually sell the coins......not so much.  

Would anyone here ever even take a chance on buying a coin with only an image like that to go on?  (Forget about return policies.)

Judging by how the other photos were taken, I think this was precisely the intention.

The Vespasian denarius stands out in a sea of silver denarii.

It only cost them one slot in their inventory.

Beyond customers clicking on it to satisfy their curiosity, I question how effective this could be as a strategy. Odd photos could turn someone off from buying, especially in a hobby where everyone is conditioned to pay particular attention to anything which is strange!

Peter

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