(c) Joost Verheyden
EQUIPMENT REVIEW NIKON D5100 Unmodified
All reviews represent my personal opinion after extended usage of the material - I have no connections to any vendor or brand.
Left: the Nikon D5100 (Nikon Website)
I purchased this camera new in spring 2013 so I have extensive experience with it since then, mostly in the area of astrophotography.
In many ways this camera has lived up to it's promises and I'm overall very satisfied with it.
Why did I choose Nikon in the (at that time) Canon-dominated playing field? Honoustly that might be sentimentel reasons since my father bought a Nikkormat back in the seventies. But I also got a number of lenses from him (he moved on to a digital camera obviously), being a Nikon 50mm F 2, a Nikon 35mm f3 and a Tamron Zoomlens 80mm - 210mm F5.6. That also influenced my decision. And in the end I'm not weary of swimming upstream.
Basically it took only a few shots to understand that in fact the 50mm was exceptionally scharp at F/2.8 or F/4. Both other lenses were not suitable for astrophotography. Lens distortion and edge scharpness were just not ok.
Why the D5100?
A one-hour exposure under fair light pollution on ISO800.
Choosing the right objects is important. When only H-Alfa is involved, an unmodified DSLR benefits greatly from an general LPS filter such as the IDAS. The contrast is enhanced and H-Alfa stands out more clearly.
Below an example of the Nikon D5100 when used with a C11 and a Starizona corrector. Notics the colors and (lack of) noise. Off-axis guiding is critical for this combination
The results speak for themselves just check this website.
What I always notice is the high sensitivity to IR of Hydrogen Alfa of this sensor. Maybe it is this particular sensor or is it just inherent to the D5100. The color of H-Alfa remains reddisch and has no pink hue to it (which I find horrible). So this property makes me very happy, you could stats it is a true-color camera which has a high sensitivity to the near-IR end oif the spectrum. I base this on comparisons of pictures of for instance the North-America nebula, taken with modified canons, on the same ISO and integration time.
On the subject of noise: ofcourse this sensor has noise to the standard of a few years back. More recent camera's will have less noise. The trick of reducing noise with DSLR in general is to make sure you dither during the exposures. The main cause of noise is color blotch, and by dithering you can more easily get rid of that noise.
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