Gueri & Fred's astronomy


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For imaging I use several lens and camera. Most of them are manual focus. In astronomy, the autofocus is not really useful. Therefore it's cheaper to get manual focus lens on the second hand market instead of buying them new.

Lens :

Sigma 15 mm : This is a fish eye lens. It's open at 2.8. But this F/D ration the quality of the images obtain is weak. It must be used least at 5.6 to obtain medium quality image or better at 8. Therefore I used it infrequently.

Nikkor 20 mm : This lens give a very wide field of view of 83x61. This is one of my favourite lens. It's opened at 2.8 but I use it at 4 where it's better.

Nikkor 28 mm : The 28mm is a standard wide angle lens it opens at 2.8 but for a better quality I prefer to close it by 1 diaph.

Nikkor 35 mm : This 35 is opened at 2. It's a little bit wider than the standard 50mm.

Nikkor 50 mm E serie: This 50 is opened at 1.8 and is very small. I use it for colour or unfiltered B&W imaging. Usually I close it to 2.8

Nikkor 50 mm 1.4 : This lens is opened at 1.4. I use it H-alpha imaging. For this purpose, it's close to 2. At this value, there is a few coma on the edge but nothing very important.

Nikkor 180 mm : The 180mm is a "small schimdt camera". It opens at 2.8 but again, for better performance, I use it at 4.

Camera :

Nikon FM 10 : The FM 10 is light and cheap camera. This is ideal for prime focus photography. In fact, I own 2 of them. Therefore, I could have 2 different films loaded into them.

Nikon FM 3A : The FM3A is the latest full manual camera from Nikon - and maybe the last -. The main advantage with it compare to FM 10 is its ability to take non astronomical photos. Of course with FM 10, it's possible to take daylight photos, but due to its exposure metering it takes a long time to get the correct shutter speed. The other advantage of FM 3A to FM 10 is the possibility to use Nikon's DG2 that increase focusing accuracy.

Nikon F 90x : The F 90x is my planetary and eclipse camera. It can also be used with the DG2 that give a noticeable improvement in focusing.

Nikon F 501 : I use the F 501 mainly as a second camera during eclipses.

CCD camera :

HX5 16 : The HX5 16 is my higher resolution camera. It use a VGA wide array of 7.4 m x 7.4 m pixels. This is my first CCD camera.

MX7 16 : The MX7 16 is totally dedicated to deep sky imaging. It's wider - actually narrowness - than the HX5 16. But it most improvement is that using Star 2000 system the MX7 16 can auto guide itself. Using the Traveler it give a 36' by 27' field.