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 Replies: 73 / Views: 17,000 |
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Valued Member
Russian Federation
172 Posts |
It is my cheap setup about $120 cost at all Only USB 8MP camera and 4x plan-achromat microscope objective on stand. No helicoid, no other lights. I shot from 1 feet from coin and near window (cloudy sky without sun) I put just one A3 paper sheet between window glass and coins    |
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Pillar of the Community
Canada
2784 Posts |
Justwalking that lens and camera takes incredible photos. you know how to use this camera very well. Justwalking just wondering is your microscope objective lomo 4X. great photos.
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Valued Member
 Russian Federation
172 Posts |
Thanks, Rocky. It is cheap Chinese noname finite 4x plan objective still available about $25 for new one. I'm curiouse to try 10X to see how big can be working distance without
bellows.
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Pillar of the Community
Canada
2784 Posts |
Justwalking yes I would like to see that as well great photos.
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Pillar of the Community
 United States
4036 Posts |
I like the "3D" look of the Nickel image. I wonder if it's the lighting that gives it that look?
Contact me for photographic equipment or visit my home page at: http://macrocoins.com |
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Valued Member
Russian Federation
172 Posts |
rmpsrpms... all 3 coins were shot in 10 min with same light from window.
To achieve effect of half dark/half light on last coin I move it far and close to white paper sheet. No other tricks was used.
Probably we can see reflection of that paper on the right side of the coin.
Edited by Justwalking
02/08/2017 7:28 pm
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Pillar of the Community
United States
4036 Posts |
I guess it's just the low incident angle of the light. I've taken coin pics from low angles and it does seem to emphasize the 3D nature of the coin features.
Contact me for photographic equipment or visit my home page at: http://macrocoins.com |
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Valued Member
Russian Federation
172 Posts |
It's look like still enough daylight and paper sheet for more magnification From 2 inches without stacking. Here is full frame resized to 1:2.  |
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Pillar of the Community
United States
4036 Posts |
Pretty nice! Looks similar to the quality achievable using a Tominon 35mm at around f8. The mag looks like ~4:1, so you may be in the f40 effective range. Can you share a 100% crop of the sharpest area of the image? It looks like you critically-focused on the rim, but you might try a similar shot critically-focusing on the top of the D. This appears to be the mid-point in the topography.
Contact me for photographic equipment or visit my home page at: http://macrocoins.com |
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Valued Member
Russian Federation
172 Posts |
Unfortunately I did not save initial .bmp, so I can't show 100% crop.
As for magnification it's ~1:1 for my sensor. The tube lenght was about 30 mm instead 200 required for 4:1 for this objective.
Thanks for the tip about topography and focusing.
Edited by Justwalking
02/09/2017 1:25 pm
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Valued Member
Russian Federation
172 Posts |
It is sunny today, so I can take little more magnification ) Full frame, no stacking, about 2.5:1 and 20mm WD.  And this is 100% crop converted to .jpg  Another one with ~3:1 magnification  Edited by Justwalking
02/11/2017 05:47 am
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Valued Member
Russian Federation
172 Posts |
Some funny with my setup. With only this microscope objective through triple glass window and dirty mosquito net. Working distance is about 150 Meters(!) from the top window on pic and about 10 meters from tree. That's what I call DOF LoL  Edited by Justwalking
02/13/2017 09:30 am
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Valued Member
Russian Federation
172 Posts |
And finally with 238857 miles working distance I bet this is a world record for microscope lens   |
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Pillar of the Community
United States
9395 Posts |
Quote:
And finally with 238857 miles working distance I bet this is a world record for microscope lens
With that much working distance, I guess the effective N.A. is really small. Using a 4X objective (depending on what type) must be like shooting with a 35-50mm lens, stopped down to perhaps f/8 - f/11? I've never tried the moon with anything less than 400mm. |
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Valued Member
Russian Federation
172 Posts |
Yes, there nothing advantage compared to tele-lens and it's shots looks like monocle-style photo.
It was kidding shots.
I just wondering that microscope finite lens can focus to infinity without any other optics.
As for coins this mean it can focus from any resonable distance with only thin helicoid without bellows to fit any size coin or it's part on small size sensor full frame.
Edited by Justwalking
02/14/2017 03:47 am
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Valued Member
United States
441 Posts |
Justwalking....I have one of these 8MP USB cameras as well. I want to use it to get close ups on mint marks and dates and other strange stuff on the coins I search. I'm able to get good shots of the mint marks, but not sure what type of objective I'd need to get full shots of the date/mint mark or the "liberty" on a US penny.
How do you get these full coin shots using a microscope objective? I have a Nikon M5 objective and cannot get anywhere close to a full coin shot like you show.
Also, when using this camera, I seem to get alot of pixelation (white dots) on the captured photo. How do I prevent that?
Any advice is appreciated.
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Replies: 73 / Views: 17,000 |
Posted 02/08/2017 12:17 pm
