• Welcome to BirdForum, the internet's largest birding community with thousands of members from all over the world. The forums are dedicated to wild birds, birding, binoculars and equipment and all that goes with it.

    Please register for an account to take part in the discussions in the forum, post your pictures in the gallery and more.
ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

Recent content by andrew1905

  1. A

    Focus lost when I track flying birds from sky into noisy background

    Try Google with "Canon R7 focusing issues" you will find several interesting You Tube clips. Duade Paton for example .https://www.youtube.com/watch?v=hsmY4f1J0t8 Also...
  2. A

    Spotting scope identification

    Google lens says it's a "Celestron Hummingbird". Regards Andrew
  3. A

    The topic of eye relief. What is it actually?

    To manufacturers and designers your quite right. However, to a consumer, as long as it's large enough details about it are irrelevant and hence academic as far as they are concerned. This was what I was referring to. Regards Andrew
  4. A

    The topic of eye relief. What is it actually?

    Thanks for the links. The second one is how I would measure it. On the first it assures the field stop is the eye lens which may not be the case. In truth this is all very academic. Best try before you buy. Regards Andrew
  5. A

    The topic of eye relief. What is it actually?

    I can only suspect they don't measure it from the same place. Just goes to confirm one should, if at all possible, try before you buy. Regards Andrew
  6. A

    The topic of eye relief. What is it actually?

    I think you would need to look at the whole design to be sure exactly what's going on with a particular optic or series. Variations in how focus is achieved, fixed or variable magnification etc. Personally, I have never had an issue which has encouraged me to measure the ER of my binoculars or...
  7. A

    The topic of eye relief. What is it actually?

    The exit pupil is the aperture throught which all the rays from the eyepieces pass through and the eye relief ER is its distance from the closest you can practically get to the eyepiece or some other defined plane like the location of the fully wound in eye cup. In use you eyepiece exit pupil...
  8. A

    Hi

    New to birding and found this site. Based in the north west of the UK near Chester. Interested in photographing birds to help identification. Regards Andrew
See more
Back
Top