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New Eyepiece - SDL4 (1 Viewer)
- Thread starter Bill Atwood
- Start date
Thanks for the heads-up!
Sharper, brighter, no mention of field width, so I assume it’ll be the same. So bit narrow at the short end, opening up to. very useful width and then getting a little dim at the highest power. Be good to have a more detailed comparison of specs published?! If I was designing a new zoom I’d have asked for more field width, even if it meant a slight reduction in zoom range (I’d probably trim the low power end a little)
Peter
Sharper, brighter, no mention of field width, so I assume it’ll be the same. So bit narrow at the short end, opening up to. very useful width and then getting a little dim at the highest power. Be good to have a more detailed comparison of specs published?! If I was designing a new zoom I’d have asked for more field width, even if it meant a slight reduction in zoom range (I’d probably trim the low power end a little)
Peter
Boogieshrew
Well-known member
In a very short comparison between my SDLv2 and a SDLv4 today, I could see no difference. At times I thought the v4 may have a touch more contrast but when I looked again it didn't 🤷🏼♀️
Boogieshrew,
I sent two MM4 with v3 zooms back because of chromatic aberration. I assumed it was the bodies, but with hindsight it could have been the v3 zoom eyepiece, so I am interested to see Opticron has replaced "one of the eyelens elements with ED glass to help reduce chromatic aberration". Did you ever see chromatic aberration with your v2 ? Did you see any with the v4 ?
V3 has a wider fov so I expect the v4 to have that too. Optically, I agree, no perceivable difference.
Boogieshrew
Well-known member
Hi 4john,
I've not seen any with my V2. Last year I tried my V2 against a V3 (both on my scope so no variables that way). My V2 was sharper than the V3. I put it down to sample variation. I'd rather have my sharp V2 with a touch less fov that a poorer view V3 with more fov.
I didn't see any on the V3 or v4 but I'm not prone to it and I don't induce it. I don't go looking for to avoid "training" my eyes to see it, if you see what I mean.
All the best
Boogieshrew
Well-known member
V4 is wider than V2 👍
That is very interesting, as I have read some reports of CA with the sdl-v3 while I don't have CA with my fixed HDF-eyepiece.
Boogieshrew,
Thanks for the reply. Like you I don't go looking for CA and I don't want to learn how to induce it. That was why it was such a shock to see it so badly with the both of the two MM4 bodies and the same SDLv3 I tried. With hindsight I should have tried a few SDLv3 - that might have fixed the problem, allthough as
Opticron is now saying that the v4 has an ED element "to help reduce chromatic aberration", it might not.
Boogieshrew
Well-known member
I think sample variation plays a big part, possibly outweighing differences between versions. My V2 was distinctly better than the V3 I compared it with last year. Sample variation is the only reason I can think of to account for that.
Having said that a new ED element is surely an improvement for the V4 and one that I could not see in my very brief comparison last week. It will probably only show over time and use in certain conditions.
Having said that a new ED element is surely an improvement for the V4 and one that I could not see in my very brief comparison last week. It will probably only show over time and use in certain conditions.
