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.
Yes, you can zoom between 500mm and 1750mm. At 500mm you are at f5.9 which is much better.
Adrian Dancy said
Thu Sep 15 2:30 AM, 2011
Paul Wilson wrote:
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.
The set up certainly didn't have me wanting one!
simonthew said
Tue Sep 13 7:29 PM, 2011
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
Geoff Hargreaves said
Mon Sep 12 11:02 PM, 2011
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
cheers geoff:biggrin
IanPlant said
Mon Sep 12 8:36 AM, 2011
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'
JOHN TYMON said
Mon Sep 12 6:54 AM, 2011
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
simonthew said
Sun Sep 11 10:12 PM, 2011
i have just bought my first digital slr. how do i connect it to my scope. is it a universal connecter or do i need a speciel one .
Yes, you can zoom between 500mm and 1750mm. At 500mm you are at f5.9 which is much better.
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.
http://www.the-digital-picture.com/Canon-Lenses/Field-of-View-Crop-Factor.aspx
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!
thanks , simon
cheers geoff
camera is sony, scope is camlink
thanks, simon