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Bayonet photography http://forum.bajonet.be/viewtopic.php?f=30&t=826 |
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Auteur: | virjinz [ 14 sep 2008, 09:03 ] |
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Auteur: | Kilian [ 14 sep 2008, 13:55 ] |
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Took some more test pictures. With this camera I can´t get the exposure right when using a white background. |
Auteur: | Orita [ 14 sep 2008, 14:33 ] |
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- Kilian: How close can you get when you take a picture using your digital camera??? I don't use a black background for different reasons in the headstamp photography; it may be OK if the shell cases are made of brass and with enough light. Steel shell cases [coated with dark green or brown laquer] and black background is not going to work. I have many hundred photos showing headstamps of shell cases from my collection and it will be too much for "virjinz" to post here. Orita 09/14/08 |
Auteur: | Orita [ 14 sep 2008, 15:42 ] |
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- @ Kilian: Speaking about your Dutch made 20X139 [inert] steel shell case, I cannot tell you for sure the date of manufacture. Unfortunately not all the headstamp markings are helpful. At the same time I can tell you that the only ammo plant from Holland which made the 20X139 ammo was NWM "De Kruithoorn" between around 1980-1998. The 20X139 round is for the "HS-820 (Oerlikon KAD)" and "Rh-202" 20mm automatic cannon. See more about this type of round here at http://www.municion.org/mapa/central09.htm and click on => "20X139". Note: I also have a fired [inert] 20X139 steel shell case made in Holland and headstamped "20X139 DM1 A1" over "LOS NWM- 2-102-X". The fired primer screw is marked "DM64" over "LOS IWK-1-14". Orita 09/14/08 |
Auteur: | Kilian [ 14 sep 2008, 15:48 ] |
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Orita schreef: How close can you get when you take a picture using your digital camera??? Approximately 4 cm between front of lens and object, in full wide angle close-up mode. |
Auteur: | Orita [ 14 sep 2008, 15:59 ] |
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- @ Kilian: With all the 3 aluminum tubes between the camera and lenses I can get about 5-6 cm close, closer if I use more tubes but it's no need for that. A wide angle lenses will not help the photography at very close ranges. Orita 09/14/08 |
Auteur: | Kilian [ 14 sep 2008, 19:36 ] |
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Orita schreef: A wide angle lenses will not help the photography at very close ranges. Orita 09/14/08 My camera has a zoomlens. In the camera´s macro function and the lens fully zoomed out, i.e. in wide angle position, you can get the object sharp at approximately 4 cm from the lens. With these settings I took the pictures of the headstamps and the rusty Dutch 6,5 mm Mannlicher bullet. When the camera is in macro function and you zoom the lens in to tele, you have to go much further away (30 cm) from the object to get it sharp. That is what I meant. |
Auteur: | Orita [ 14 sep 2008, 22:18 ] |
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- @ Kilian: I don't have zoom lenses. I only have 4 types of lenses: 200mm, 135mm, 50mm [normal with 47 degrees field angle] and 20mm [wide angle of 94 degrees, I got it from Dordrecht, Holland]. All my lenses are attached to the camera by thread, not by the bayonet system. ---> I asked some other cartridge collectors about the date of manufacture and the headstamp for the Dutch made 20X139 round. No answers yet but I'm sure the date of manufacture is related to the lot number which is registered in the maker's file. Orita 09/14/08 |
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