Chris B.
Well-known member
Over six months ago, I thought I was going to purchase a Televue TV-85 for the purpose of photographing distant birds with my DSLR. At the time my longest camera lens was a 400mm. Through a series of fortunate events, I was able to purchase a Canon 500mm f4 lens and have been using it since for photographing a variety of subjects but mostly birds. Frequently I use it with a 1.4x converter, making it a 700mm f5.6. But distant birds are still a challenge to photograph and even by adding a 2x TC and then stacking that with a 1.4x, I'm getting essentially a 1400mm f11 and even with the superb quality of the Canon lens, images at that distance are mediocre at best... I'm guessing because of the number of elements involved
If I understand what I read on this forum correctly, I can invest in say a reasonably good Orion 80 ED APO refractor with a (photographic)focal length equivalent of 600mm and with the addition of several decent Barlows or even stacking the same combination of TCs I use with my lens easily achieve that 1400 or beyond with better image quality.
It seems too good to be true so I have to ask: what am I missing here?
Chris
If I understand what I read on this forum correctly, I can invest in say a reasonably good Orion 80 ED APO refractor with a (photographic)focal length equivalent of 600mm and with the addition of several decent Barlows or even stacking the same combination of TCs I use with my lens easily achieve that 1400 or beyond with better image quality.
It seems too good to be true so I have to ask: what am I missing here?
Chris