Can you not vary the focal lengths with this set up? I am sure I have seen images taken at 500 and 600 equivalent with this set up?
With a focal length of 1700mm and an fstop f21 you are certainly going to get soft images owing to, low shutter speeds combined with subject movement, rig/camera shake ,effect of atmospherics at medium to long distances but even if these were not an issue, image sharpness would be compromised owing to diffraction which probably starts at around f8 (but not percievable) and will become apparant before f21 is reached.
At the recent Birdfair at Rutland they had a Nikon set up consiting of a D300s body (£1100), a FSA-L2 Camera Attachment (£700) and a 85mm EDG Straight Fieldscope (£1700).
Total cost of this set up works out at £3500. I was impressed by the effective focal length of 1750mm. Unfortunately the aperture at that focal length is f21, so not really workable! Also, the image seemed quite soft when compared to a "proper" lens.
The set up certainly didn't have me wanting one!
Can you not vary the focal lengths with this set up? I am sure I have seen images taken at 500 and 600 equivalent with this set up?
With a focal length of 1700mm and an fstop f21 you are certainly going to get soft images owing to, low shutter speeds combined with subject movement, rig/camera shake ,effect of atmospherics at medium to long distances but even if these were not an issue, image sharpness would be compromised owing to diffraction which probably starts at around f8 (but not percievable) and will become apparant before f21 is reached.
At the recent Birdfair at Rutland they had a Nikon set up consiting of a D300s body (£1100), a FSA-L2 Camera Attachment (£700) and a 85mm EDG Straight Fieldscope (£1700).
Total cost of this set up works out at £3500. I was impressed by the effective focal length of 1750mm. Unfortunately the aperture at that focal length is f21, so not really workable! Also, the image seemed quite soft when compared to a "proper" lens.
thanks all, just got a better lense so i will see how i get on with that. i did wonder how you could get a clear photo from a scope. like geoff says they make it look easy on an advert. thanks , simon
Simon,i,d think long and hard before jumping in at the deep end,you,ll have to decide what type of image you want to end up with,digiscoping has it,s limitations,the adverts will show you an eagle five miles away in feather splitting detail,but it,s an advertmr tymon and myself went head to head on friday trying to nail the phalarope at an impossible distance I could only get a less than record shot,john,s at the same distance were a little better,i,m no expert in this field but a dslr with a huge lens£££ will produce good images of distant birds,you can 'cheat' digiscoping but you have to practice and get lucky
You need a 'T' adapter. You could try you local telescope shop they might be able to supply you with one that fits, or search your 'make of camera to scope t adapter'
probably no connector can be baught to work between those two -dslr to telescope adaptors are normally expensive ,in the regeon of £400,it would be cheaper to buy a second hand decent lens,and the quality through the scope would be much poorer than with a propper lens
mr tymon and myself went head to head on friday trying to nail the phalarope at an impossible distance I could only get a less than record shot,john,s at the same distance were a little better,i,m no expert in this field but a dslr with a huge lens£££ will produce good images of distant birds,you can 'cheat' digiscoping but you have to practice and get lucky