3 replies to this topic

[Daniel Mounsey]

Hi Tom,
One of the interesting things I did not mention in my earlier message to you is how the bino did not appear to give the 3D effect that others have mentioned. I have been using the TV bino for years now and I have only noticed a 3D effect on star clusters sometimes. The issue was probably blown out of proportion a bit. Maybe in the future, you will notice this in certain clusters. I am also curious to know if you think the TV amplifier had anything to do with cutting down the light transmission. It really has a lot of glass.I personally don't like it with smaller apertures and prefer the light transmission of the standard 2x TV barlow, but this does increase the focal length to 3.5.
Daniel

[Tom T]

Hey Daniel,

Actually, that's quite possible - we all know more glass = less light with all other things being equal. But it wasn't the impression I got. Additionally, I did specifically test the OCS on both units, and the denk still went *slightly* deeper.

FWIW, your article on planetary eyepeices applies extremely well to anyone who is looking to optimize throughput with their scope. My next BV task is to determine (for myself)the magnitude loss verses monoccular vision with both complex and simple eyepeices.

I'm with you on issues being blown out of proportion - the differences in the Denk and TV are really very tiny for the most part - IMO, the biggest issue was the low power correction that the Denk OCS would provide.

I'm given to understand the TV corrector is actually very similar to a powermate.

I keep looking at those clusters, but I'm still not seeing 3-d. One other thing that Jim suggested to me was that I wasn't using enough aperture. My 10" dob will be home soon (it's been off getting some work done), and I'll have an opportunity to pop the Denk in it and see what happens.

Tom T.

[Tom T]

The only semi-3d thing I've seen/experienced so far was one evening, when viewing the moon, the craters reversed themselves and became domes. When I looked away and back, it went away but the effect reappeared shortly there after. It was a little disconcerting actually.
I wound up packing it in a little early that evening. Haven't had that happen since then. It reminded me of one of those 3d drawings where if you concentrate, you can flip the front and back in your mind.

Really odd....

Tom T.