These three cameras from Zeiss Ikon share the same aluminium casting for their bodies. This makes them very similar cameras. They all take 120 film and they all produce half-frame negatives of 6 x 4.5 cm. The details, however, are different. I shall give the differences between them one model at a time, starting with the oldest.
This camera was produced from 1931 and is using the old fashioned dial set shutter – the disc at the top with the word ‘Derval’ on it.. The adjuster for the aperture is at the bottom of the shutter housing and requires the user to turn the camera around so that the scale can be seen. The lens is a Novar triplet lens. There is also a leather hand strap on this camera and the catch to close the back is solid.
Next is the Bob 510 (sold in the UK as a Nettar 510). This is a slightly later camera first produced in 1934 and has a more modern rim set shutter – the dial is now replaced with a ring around the shutter housing. Shutter speeds and apertures are the same, but the aperture adjuster is now on top of the shutter housing, behind the speed selector. This means that the user can adjust the aperture with the camera pointing at the subject. Perhaps not a major advance but will have been less frustrating to use. The lens is now a Nettar rather than the Novar – still a triplet but a different design. There is no hand strap on this camera and the catch for the back is less secure than on the Ikonta
Last is the Nettar 515. This is later again, 1937, and also has the rim set shutter. The shutter is now a Klio (on non-Zeiss Ikon cameras known as Prontor) with more shutter speeds (up to 1/175 and a few slow speeds). The aperture adjuster is still on top, behind the speed adjuster, and there is now a delay setting lever below the shutter housing. As with the Ikonta, the lens is a Novar triplet. This shutter requires cocking before use and there is an ancillary shutter release button on the camera body. There is also provision to fit an optional brilliant finder on this camera although mine does not have this. This model also has no hand strap and it has the same catch as the Bob 510
|All three together, oldest on the left, newest on the right.|