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Anonymous
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Hi folks, I have to make a decision. I'm going to get either the Maxview 40mm (1.25") or MaxviewII 40mm (2") eyepiece to use with my digital camera and 80mm scope. This eyepiece can be used to connect the camera to the scope for afocal photography and can also be used as a standalone eyepiece (with good reports from what I've read).
I can get the MV for a great price but I keep reading about how the 2" 40mm in my 80/9d scope will be a breathtaking wide-field scope (I have a 2" WO diagonal) for visual viewing.
Is the 2" 40mm eyepiece in a scope like mine really going to make that much difference compared to the 1.25"??? I'm confused. Another question is vignetting and the 2" is supposed to alleviate that problem with my camera (Canon A80). 
What to do, what to do... 
HELP!!!
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Anonymous
Unregistered
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Tom;
Are you ordering the camera stuff by Scopetronix?
I like my binos for wide field viewing. Then the other day I put a 32mm 1.25 EP in while looking at M45 Instead of my usual 24mm. It made quite a difference in the view. I really did not expect to like it. I would like to try a 2" 32mm and compare the wide field. All that to say, I think you would like the 40mm visually. Not to mention I will get to try it out  ) Since it will also solve the camera problems, seems like a good deal.
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Anonymous
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Hey Keith, yep, it is the scopetronix stuff. Scopetronix recommends the 2" for my camera for vignetting but it also adds a whole lotta cash to the equation. If the 1.25" can still meet my needs then I would prefer the smaller, less expensive option for now (hey! I'm just learning the photo stuff and can upgrade later). Problem is I have been wanting a 2" 40mm eyepiece for awhile to use with my 80/9D and WO 2" (kind of like Vic's Wide Field Kit for my scope).
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jmoore
Carpal Tunnel
Reged: 10/01/03
Posts: 1959
Loc: Beaufort, NC
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Tom,
I did some calculations for you. You have the Orion 80ED, right? This scope has 600mm focal length.
The two EPs you're looking at are both 40mm EPs, so will both give 15x in magnification. However, the 1.25" EP has an APOV of 44 degrees, while the 2" EP has an APOV of 55 degrees.
As you're probably aware of, your true FOV = APOV/mag. So, with the 1.25" EP, you've got 44/15 = 2.93 degrees FOV. With the 2" EP, you've got 55/15 = 3.67 degrees FOV. This difference is pretty substantial. However, 2.93 degrees FOV is still pretty huge...big enough to fit all of M31...and to frame M45 very nicely. So, if you can get a killer deal on the MV, but not the MVII, I'd probably just get the MV. And, then you don't have to take out the 2" adaptor to switch EPs.
As for the photography issue, I can't help you there, but I've read about both the MV and MVII, and I think that while the MVII will always reduce vignetting more than the MV will, the MVII should only be really necessary for cameras with big ol' lenses.
good luck deciding.
jeff
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Hardin 12"
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Anonymous
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I was thinking of getting the adapter for my Canon A40 from them. I was just going to use my 32mm 1.25 EP and see what happened. I don't think a 40mm will do me any good as a visual EP. I already have 11X70 binos and like the view.
When I spoke with Scopetronix they told me the viginetting was not that big a deal for astrophotography, it was more a terrestrial concern. But hey, don't let me talk you out of the next toy. 
Keith
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Anonymous
Unregistered
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Jeff, Actually it is the StellarVue 80/9D (fl of 750mm) but your equations will still help immensely. substituing my fl, the numbers saw the following:
Magnification: 18x
FOV would be 2.44 for the 1.25" and 3.06 for the 2"
Even with these numbers its a good eyepiece either way. Man!!!
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Anonymous
Unregistered
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Are you talking about the digi-T system they have where you attach to an eyepiece with a groove where the eyecup goes? It does offer additional options (eyepiece wise) for afocal shooting. I've thought about that system too.
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Anonymous
Unregistered
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Tom;
Yes. What system are you talking about?
Keith
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Anonymous
Unregistered
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Their MaxView 40 system here
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Anonymous
Unregistered
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Thanks Tom
I didn't realize the A80 has a different mounting system available.
Keith
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jmoore
Carpal Tunnel
Reged: 10/01/03
Posts: 1959
Loc: Beaufort, NC
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The two systems are very similar (Maxview and digi-T). Both use a step ring that attaches to your camera on one end, and threads to the eyepiece on the other end. The difference between the two systems is that MaxView EPs are already threaded. Thus, the MaxView kit consists of only the step ring (I think), which screws directly onto the MaxView EP.
With digi-T, there's a Digi-T ring that attaches to your regular EP, and then the step ring threads onto this T ring. The Digi-T kits are thus more expensive (you pay for the T-ring), but the advantage is that you don't need to buy the MaxView EP.
jeff
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Hardin 12"
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jmoore
Carpal Tunnel
Reged: 10/01/03
Posts: 1959
Loc: Beaufort, NC
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So Tom, which EP you gonna buy?
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Hardin 12"
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Anonymous
Unregistered
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Still want to finish checking out the digi-T system and using my own eyepiece. I think the 1.25" would be fine but I sure would like that extra bit of view that the 2" offers. I'm not in a hurry since the skies won't clear until June!
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Victor Kennedy
Pooh-Bear
Reged: 05/22/03
Posts: 9850
Loc: Slovenia
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Tom, I'd go for the 2". I have a Stellarvue AT1010, and bought a 2" Axiom 34 mm eyepiece for it last year. The widefield view is very nice.
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To err is human; to moo is bovine.
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