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 Replies: 18 / Views: 5,616 |
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Pillar of the Community
 2087 Posts |
Heres the resultant picture from a total of 224 pictures. It is very much a learning Picture. For the obverse image I ignored Fotodiox's recommendation that when blending the images Vignetting control and Geometric distortion correction be applied. From now on I will follow those instructions ( if you look carefully you will realize why) the reverse picture was with those two corrections turned on, and it is much more life like in appearance. Fotodiox is wrong on what camera settings to use I found its best to use manual. To set the exposure I moved the rhinocam around until the whole sensor was filled with the coin then I set the exposure and did not adjust it again  the lighting was not the ideal type... From previous experience near on axis lighting is best for these shots with the Mamiya 80mm Edited by austrokiwi
07/07/2015 06:38 am
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Pillar of the Community
United States
1512 Posts |
Those photographs are amazing! Please keep them coming!
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Pillar of the Community
2087 Posts |
one more test. This photo is a little frustrating my old eyes "missed" the start of the stacking sequence with the result the fields are not as sharp as they should be. Lighting was problematic. To get the best lighting, although it immediately brings in more softness, I used a Lighting rig modeled on a Siemens DOAL( Diffuse on Axis lighting) unit. The lens added some limitations as the short focal distance of the Mamiya 80mm did not allow me to place the coin optimally( lens would have collided with the beam splitter). All indications so far suggest that the set up should sing with the Lens I developed it for ( printing Nikkor 105mm). With the nikkor I will use a microscope ring light not the beam splitter. With the nikkor I will be using almost all of the image circle the lens produces so I do wonder if I am going to see some previously unreported artifacts( vignetting, peripheral distortion etc) From my experiences with that lens so far I doubt it....but you never know until you try. Here is the photo ( there is heaps of room for improvement especially note the coloration of the lower part of the medal)  What really intriques me is that in the past when I have tried stitching I have obtained 100mp + images. With this technique I am only getting 40mp plus but with much higher visual quality. That suggests, to me, that the technique is much more efficient I do wonder how it might compare in comparison to a telecentric lens. I went in this direction because I wasn't confident with a telecentric set up Edited by austrokiwi
07/07/2015 06:07 am
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Pillar of the Community
2087 Posts |
one more trial with the Copper medal..... Its much closer to real life now( This technique takes some practice to get right)  |
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Pillar of the Community
Canada
2784 Posts |
austrokiwi wow great images. a question you say this is almost identical to the coin. I like that you have done and excellent job on your coins. so you do this by stacking. what does that mean are you taking many picture and then putting them together some how. I am just wondering if you don't mind my asking.
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Pillar of the Community
2087 Posts |
With that photo there was no stacking, Only stitching was used. Magnification is 1-1, lens was a medium format Mamiya sekkor c 80mm set at F8. At F8 the depth of field made stacking unnecessary. All I did was take the eight photos needed to create a 645 sized image and then used the panorama stitching program in Adobe elements...... there was one other major contributor....I installed a graphics card to the computer; the processing speed and the quality of the output was significantly better( a note..... the picture looks heaps better on my screen I have no idea what it looks like on others). That sort of photo really makes me wish I had the cash for a medium format camera!! The 80mm isn't the sharpest of lenses so I am waiting for the arrival of the adapter( next week I hope) that will allow me to use the printing Nikkor. One observation The Rhinocam was designed for outdoors use... the amount of set up time I have to go through to photograph a coin suggests to me that it not that useful for its claimed design purpose. As RMPSRMPS observed the Rhino cam is an X-Y shift adapter. One thing I forgot to mention to fit my camera on the Rhinocam( in portrait orientation for the 645 format) I had to use an extension ring set, which actually made setting the 1-1 magnification simpler
Edited by austrokiwi
07/08/2015 1:24 pm
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Pillar of the Community
Canada
2784 Posts |
austrokiwi thank you. great info and really great photos. I am going to read and study this a bite. I am going to try this. like your results I will see later what I can do. again thank you
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Pillar of the Community
2087 Posts |
Rocky the only issue is price the Rhinocam for the nikon mount is expensive. Actually I think a cheap Sony Nex ( manufacturer refurbished) would do a very good job with the Rhinocam ( my A7r is over kill in this case) Last picture until I get the adapter:  Coin is a Birmingham mint 1780 Maria Theresa thaler trial strike in Copper, most probably struck in 1949 ( only 8 struck) edit I don't recommend clicking on the image and down loading it, as admin pointed out in another forum, its a 68MB download of 162 Megapixel stitched image! No wonder I needed to add ram and a graphics card  There is some softness in the image..either I missed the focus with my old eyes or I need to get a new Column for my copy stand( probably a combination of the two) Edited by austrokiwi
07/09/2015 08:13 am
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Pillar of the Community
Canada
2784 Posts |
hello austrokiwi well tried my first stack using adoble photoshop elements 13. it was of a 2006 twoonie. it went very well. I was quit surprised by the size of the image. once I cropped it and down sized it. I must say it went well. I will do a bunch more before I start to post any yet. wanted to ask you your e14 lights is it this one, 2015 Bright 15W Energy Saving E14 69LED in the shape of a light bulb day light variety. I was wondering or is yours the one shaped like a flat light square panel with 72 bulbs. I seen one that was flat and it came with a diffuser, light colour was 5000k with diffusion just wondering. watched the rinocam video quit a piece of gear. have a great one
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Pillar of the Community
2087 Posts |
For the last shots I was using a beam splitter( edmunds 50/50). The lighting for it is a 160 led light panel of 5600k. The beam splitter is mounted in a set up I modeled on a Siemens DOAL 75 unit ( obviously mine is larger than the Siemens unit). The siemens unit uses 6000 k lighting. For other lighting I use 12 watt LED E14 lights( 15 would be better). For long exposure shots.... I use two self made spotlights( using minolta 55mm 1.8 lenses to control the beam and dim the light) these are also powered by E 14 LED lights
Edited by austrokiwi
07/13/2015 08:09 am
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Pillar of the Community
 United States
4038 Posts |
Surplus Shed occasionally has good deals on interesting stuff. Right now (ending today...) they are offering a Computar LF 105-150mm zoom lens for $20. Quite a deal. Not sure how to mount it but should not be too hard. Here is the link: http://www.surplusshed.com/detail.cfm?ID=L10514I could not resist and bought one to test. They say they have a lot so may extend the sale but nominally it does end today. I'm going to post this to El-Cheapo thread as well since it really is cheap! BTW they charged me $6 shipping... |
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Pillar of the Community
2087 Posts |
I ordered one but I am not holding out for a great lens.... Zooms have never done well with me and coins. I did a quick google search a couple of sites mentioned that it could be a medium format enlarger lens( zoom variety). That site has been selling them for years at US$20.00 ( plus postage its worth a punt) Edit... I wrote to soon....they apparently were designed to fit a twin lens reflex camera so the mount is going to be a bit of a challenge
Edited by austrokiwi
07/18/2015 11:48 am
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Pillar of the Community
United States
4038 Posts |
I've seen them on Surplus Shed site for quite a while but they've been selling for $49, not $20. I was never interested enough to pay $49 but for $20 I thought it might be worth a try...
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Pillar of the Community
Canada
2784 Posts |
austrokiwi I bought a new lens. got a great deal on the lens. the photographer had to build and adapter for the lens to mount on a dslr camera. the images he took were astounding. the problem for myself is the lens adapter is described in the German language. I wonder is there anyway you can help me. when the lens get here. I will need to build that adapter mount. the clarity of the images are off the scale. so when it gets here I will take pictures and just wondering if you can help me. if some one can read German perfect that would help as well.
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Pillar of the Community
Canada
2784 Posts |
austrokiwi thank you its ok. I found that I can translator on google. I got the whole thing translated. I have what I need to adapt this lens to my canon. I have already purchased the pieces off ebay. so once I get every thing I will put the lens together and give it a run at coins. I will see if I can get the same results. as the photographer got on the other forum. I hope |
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Posted 07/07/2015 12:45 am
