Originally posted by UncleVanya For this use what about picking up a telescope and a t-mount adapter to mount the DSLR on it?
The AF 1.7x and the HD 1.4x can be stacked - search a bit and you will find some threads on it. I think the 1.7x has to be first to get AF but I'm not sure - someone else may be able to chime in on it.
Well, I was trying to kinda reduce what I typically wanted to carry. I could definitely take my 85mm spotting scope and do some digiscoping but that's just one more thing to haul around for such a limited use. If this was something I did all the time, I would definitely be looking at better glass or a dedicated spotting scope/digiscoping setup.
Originally posted by pjv @normhead has great success stacking TC's.
That does sound familiar. I'll have to check it out again.
Regarding the 1.7x, is there one preferred model that would be better to look for. Admittedly, I haven't spent much time gaining knowledge of TC's so I'll have to dive into the lens reviews for the different TC's.
Originally posted by bertwert I think you may find even just the 1.4 is enough.
If I was you and needed a second TC I would get another 1.4 for the sealing, looking at the picture of your K-3's screen...
That would be:
0 TC: 300/4
1 TC: 420/5.6
2 TC: 588/8
Yeah, it was a rough trip. The K3II and 18-135 spent 4 days in the Alaskan backcountry hiking in rain and muck and then rafting for three days on silty glacial rivers. Perhaps a topic for another thread but it held up pretty good. Water did get in under the screen protector but that has been cleaned. There was one point where the camera didn't want to turn on but after letting it dry a bit it seems to be fine.
I'd love to pick up another HD 1.4x but they are quite pricey compared to the relative cheap cost of some other TC's I've seen. Plus, due to the loss of light when stacking TC's or even using a less than stellar performer, I doubt it would be used when the weather was much less than ideal.