Test of some close-up lenses mounted on the E40(E60+) completed
Not surprisingly the professional Inframetrics and Agema/FLIR lenses performed best but then they are almost 60mm diameter of high quality Germanium ! They also cost a small fortune. I include them as a reference only and not a serious proposition for many Exx camera owners.
Mounting a close-up lens on the Exx series :
Fortunately the Exx series standard 18mm lens has a parallel lens barrel plus a rubber grip sleeve that extends beyond the lens barrel chassis. There is no threaded section inside the lens barrel. There are many options for mounting an auxilliary lens to such a lens barrel but the two that come to mind are:
a) A friction fit inside the rubber lens surround.
b) A slip on type lens holder that mimics the fitting of the rubber lens cap. Many sizes of rubber and plastic push on lens caps are available on ebay for very little money. Look for binocular lens caps as well as camera lens caps. Binoculars tend to use push on lens caps more often that cameras do. The close-up lens may then be mounted directly into a suitable hole cut into the lens cap, or first mounted into a threaded lens holder before that is fitted into the lens cap hole. This is my preferred mounting method for auxiliary lenses. Suitable threaded lens holders for 19mm and 20mm lenses can often be found on ebay as they are a vintage photographic accessory. They are often cheap.
I elected to make a cardboard lens holder tat was pushed into the rubber lens surround. It worked a treat but I would likely go down the lens cap rout for a more long term solution.
The test piece for the images :
I wanted a simple test piece that had at least one small SMD component that presented a decent target for the camera and that was representative of what would be imaged on the test bench. I found an old ADSL USB modem that fitted the bill nicely.
The chosen component on it was a nice warm 5 pin SMD device for which I will provide dimensions. I will also provide the dimensions of the whole PCB as a reference. I will also provide other images of the PCB and an overall image taken with the E60 at closest manual focus with no close-up lens fitted.
The lenses tested:
1. 20mm diameter 100mm (4") FL ZnSe Planar Convex from China. Normally used in CO2 Laser cutters.
2. Inframetrics 60mm diameter 300MM (12") FL Close-up lens - Germanium
3. Inframetrics 60mm diameter 150MM (6") FL Close-up lens - Germanium
4. Agema/FLIR 55mm diameter 150mm (6") FL Close-up lens - Germanium
5. EEV ARGUS 2 rear Germanium lens element - Spec unknown. Aperture 25mm
6. EEV ARGUS 2 front Germanium lens element - Spec unknown. Aperture 20mm
Test PCB Dimensions: 98mm x 63mm
5 pin SMD (PCB ID: U7) component dimensions :
Plastic case : 2.94mm x 1.7mm
Across full width of pins: 3.16mm
Resistor (PCB ID: R8) Dimensions
Case including solder areas 3.24mm x 1.55mm
Pictures to follow .... time for my tea now
Fraser