bestboat said:
It occurs to me that the only solution which avoids this "scrambling", and the ingress of "dust", plus the possibility of a dropped lens, is to carry two cameras, each with its own lens, since the extra weight would only be that of the second body.
I also, of course, have to carry my rucksac, with food and water, and binoculars anyway.
Does anyone else use this as a solution to their problems?
..........
On a slightly different subject, I have been considering one of the second-hand 400mm f5.6 Sigma lense that sometimes turn up,[ light and handy], or else a Sigma 170-500 zoom, [bigger and heavier].
Can any one offer an opinion on choice of these please.
Hi Bestboat,
Yes, I thing that a 2-bodies solution is a good idea. Last days I worked with my K10D on the FA600F4 and a film body (MZ-S) on the Sigma 50-500, as I have not a second digital body. I found out that this combination gave me the flexibility to face all opportunities - small birds and next a gray heron, let say - without having to change lenses. But, i did not carry these monsters, I just drove in very low speed along the canals of a drained lake.
Backpacking is a different story. For 1-day trips, a second body is still a good idea, since the K100D is a very light camera. I did it sometimes, again with the K10D and the MZ-S, and I found it very practical, for the very reasons you recall (I usally attach a macro lens on the film body and the Sigma 50-500 to the digital).
Consernig the lenses, the 400F5.6 is a much better choice, as it is faster, lighter, min focusing distance is closer and image quality is better. Chasseur d' Image made a very clear comment on these lenses. I used an old 400F5.6 once and I found it decent, allthough I had the feeling of a cheep thing, which was the case with all non-EX Sigmas. On the negative side of the 170-500 you must add that F6.3 is a bit just for autofocusing.
But, the 100mm difference is very important for distant subjects, like birds (100mm=150mm for K100D). I am using a Sigma 50-500F6.3 and I have regularilly decent results, allthough due to the small aperture (6.3) there are some mistakes in autofocusing. So, I should suggest to forget the 170-500, as the 50-500 is much better build and has better optics and to decide between the two price tags (the Sigma 400 is much less expensive in the 2nd hand market).
Anyway, moving from the 70-300 to either the 400 or the 50-500 will mark a big step ahead in your photography.
And keep scrambling - but in the nature this time !!
Regards