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Thread: TV Delos...Help!

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    Default TV Delos...Help!



    I recently acquired a Delos 6mm. First object to view was the moon. First thing I noticed was how much fine tuning the focuser needed. The view was amazing as you literally seemed to hover over the planet. But I expected a sharper view.
    Jupiter wasn't up yet so I went over to M42. Huge disappointment. Not sharp and clear as expected. Again the focuse travel needed to be exact even for a dull view. There is no play one way or the other. This I expected with high magnification but the view was just not clear.
    Turned to Sirius and another disappointment. No sharpness at all. Tried my other lenses thinking that Collimation might be off but the view was pinpoint with them. I did do a laser coll check and everything seemed good. Reviews always state how you get pinpoint clarity all the way to the edge. I can't even get good clarity in the center.
    Jupiter came up and was totally discouraged by the view. Again, no clarity. Could see the bands but they were dull.
    I did play with all the click stops for eye relief and I do wear glasses. Had to keep it all the way down.

    The temps were at 40* with no wind or clouds. We did have a lot of rain during the day but the sky was clear.
    Why such poor view? I know that many feel the 4mm needs almost perfect seeing conditions but does the 6mm also?
    I am 60 years old but felt my eyes could handle this lens.

    Any suggestions?
    Last edited by My 2 Stars; 02-17-2016 at 04:10 AM.
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    Default TV Delos...Help!

    Hmm... Might just be seeing conditions; higher magnification makes atmospheric distortion more obvious, and it may be that the seeing just wasn't up to that level of magnification.

    With my SCT I get similar results when trying to use higher magnification than the seeing will allow - things just look a bit blurry, and I get sharper views at lower powers.

    If it's a dual 1.25" / 2" eyepiece used in a 2" focuser, there's another possibility - I had a similar problem once - couldn't get sharp views but other eyepieces were fine - turned out I'd left a translucent dust cap on the bottom . Usually that'd be obvious since the eyepiece wouldn't go in the focuser, but with a 1.25 cap and a 2" focuser, it took me a while to realise .
    j.gardavsky likes this.

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    Default Re: TV Delos...Help!

    Let me ad that according to Clear Sky Chart - The Seeing Conditions were Poor 2/5. Transparency was Below Average. As you can see by my signature, I am using a 10" Dobs (F 4.7). The 6mm would be at 200 magnification which is well within the limits of the scope.
    From my research, I believe that the conditions were most likely the cause but would like to hear some suggestions/verification's if possible. I wanted the Delos for obvious reasons but am concerned that an ES in the same lens would be almost just as good at half the cost.
    John...... Listentothestars.net
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    Default Re: TV Delos...Help!

    Did you use your plossl 10mm as well for comparison or just down to the 18mm? However, even the difference in magnification is rather large from 10mm to 6mm, almost double and the 6mm really is going to need very good seeing conditions to get the best from it. Also as the magnification is increased the difference it makes from having the collimation being out is also increased. You may have had a sharp(er) view if the collimation was very accurate and / or likely the seeing was just not good enough.

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    Default Re: TV Delos...Help!

    Quote Originally Posted by Davesellars View Post
    Did you use your plossl 10mm as well for comparison or just down to the 18mm? However, even the difference in magnification is rather large from 10mm to 6mm, almost double and the 6mm really is going to need very good seeing conditions to get the best from it. Also as the magnification is increased the difference it makes from having the collimation being out is also increased. You may have had a sharp(er) view if the collimation was very accurate and / or likely the seeing was just not good enough.
    The 10mm was also a little "off". Last week my 10 gave me an incredible view of Jupiter. Big Red spot and bands were very defined. Last night, even the 10mm, detail was not as vivid as last week. BUT, between then and last night, I did fool with collimation. Inside my house, that day, I tweaked it and was dead on. Brought the scope out on my deck which is only about 20 feet from inside. When I was getting bad views, I checked collimation of primary and it was off a little. Baffled me since I just moved it 20'. But even after primary coll on deck, views seemed off. See my post #3.
    John...... Listentothestars.net
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    Default Re: TV Delos...Help!

    Quote Originally Posted by My 2 Stars View Post
    The 10mm was also a little "off". Last week my 10 gave me an incredible view of Jupiter. Big Red spot and bands were very defined. Last night, even the 10mm, detail was not as vivid as last week. BUT, between then and last night, I did fool with collimation. Inside my house, that day, I tweaked it and was dead on. Brought the scope out on my deck which is only about 20 feet from inside. When I was getting bad views, I checked collimation of primary and it was off a little. Baffled me since I just moved it 20'. But even after primary coll on deck, views seemed off. See my post #3.
    John, how long did your scope acclimate? Did you put the Delos in and defocus on a brighter star? If you do, and you have a concentric donut shape and the dark spot is centered in the middle, and the overall shape is nice and round, likely not a collimation issue. If you defocus and the donut is writhing and shimmering, you've got either poor seeing or thermal tube currents going on. Just something to check next time you set up.
    Bryan

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    Default Re: TV Delos...Help!

    John, I had a similar experience last night. I could not get fine focus at high mag with any eyepieces, and it tended to get worse as the night went on. We also had heavy rain and snow melt in my area yesterday.

    I think my problem was a combination of bad seeing and a little dew. My primary looked a little mist covered after awhile, and it wouldn't clear, even with my fan. I suspect that the secondary was starting to dew over also. I had the scope out to cool for about 3 hours and checked my view periodically.

    My Delos 6mm (my second time using it) also did not put up great views. The first time I used it, the Pup and the E and F stars of the Trap were visible with it. I tried other eyepieces last night and only the long focal length ones had decent views.

    I can't wait to try in on Jupiter and a few more globs, hopefully tonight.

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    Default Re: TV Delos...Help!

    Quote Originally Posted by bladekeeper View Post
    John, how long did your scope acclimate? Did you put the Delos in and defocus on a brighter star? If you do, and you have a concentric donut shape and the dark spot is centered in the middle, and the overall shape is nice and round, likely not a collimation issue. If you defocus and the donut is writhing and shimmering, you've got either poor seeing or thermal tube currents going on. Just something to check next time you set up.
    Bryan, scope sat out for about 1 1/2 hours before using. Focus/defocus seemed to be okay but honestly really didn't concentrate on circle. Hopefully will try again tonight.

    Quote Originally Posted by dhines32 View Post
    John, I had a similar experience last night. I could not get fine focus at high mag with any eyepieces, and it tended to get worse as the night went on. We also had heavy rain and snow melt in my area yesterday.

    I think my problem was a combination of bad seeing and a little dew. My primary looked a little mist covered after awhile, and it wouldn't clear, even with my fan. I suspect that the secondary was starting to dew over also. I had the scope out to cool for about 3 hours and checked my view periodically.

    My Delos 6mm (my second time using it) also did not put up great views. The first time I used it, the Pup and the E and F stars of the Trap were visible with it. I tried other eyepieces last night and only the long focal length ones had decent views.

    I can't wait to try in on Jupiter and a few more globs, hopefully tonight.

    -Dan
    Dan, am hoping that was my problem also. Rechecked the sky charts and it verified that seeing was poor last night. Even if I can get one brief moment of good seeing to really evaluate this EP, then I'll know it was a good purchase. Just hoping I didn't waste my money.
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    Default Re: TV Delos...Help!

    Quote Originally Posted by My 2 Stars View Post
    Bryan, scope sat out for about 1 1/2 hours before using. Focus/defocus seemed to be okay but honestly really didn't concentrate on circle. Hopefully will try again tonight.



    Dan, am hoping that was my problem also. Rechecked the sky charts and it verified that seeing was poor last night. Even if I can get one brief moment of good seeing to really evaluate this EP, then I'll know it was a good purchase. Just hoping I didn't waste my money.
    I do not think you have wasted your money. Was this purchased new? If so you can sent it to TeleVue for evaluation. They have great customer service. They simply do not want an inferior product to get into circulation.

    JJ
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    Default Re: TV Delos...Help!

    I agree that viewing conditions simply couldn't support that level of magnification. You said that even the view through your 10mm didn't look good, which would be only 119x. You mentioned using your other EPs and the views were pinpoint but in looking at your list of EPs, that's most likely because all are significantly lower power and more tolerant of what conditions allowed to your eye. 6mm is getting up there in power, and conditions have to be pretty good in order to support 200x clearly...even with a Televue. If the view isn't good at 119x, it's most likely going to be worse at 200x. Yes, 200x is well within your scope's limits, however, can easily be beyond the seeing limits. You asked the question, "I know that many feel the 4mm needs almost perfect seeing conditions but does the 6mm also?" In one word, pretty much... "yes". At least pretty darn good seeing conditions. Just for grins, try it during the day terrestrially. I test new EP optics during the day by focusing on an electric meter array of 12 round meters on the side of an apartment building ~200 yards away. Knowing my scopes are well-collimated, if I can clearly read the meter numbers and printing from center to near the edges, I know the EP optics are sharp.

    Your new Delos is probably just fine and simply in need of good seeing conditions. And re-confirm the scope's alignment and collimation is accurate. One other consideration, as remote it may seem....even though it's a TV, that doesn't preclude it from having a possible issue that slipped by QC.
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