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TV Delos 6mm

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#26 John Fitzgerald

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Posted 06 June 2020 - 02:10 PM

I think I will try to find a decent 6mm Radian.  I wish the Delite came in 6mm.  Good enough for me.  Thank you for all the responses.


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#27 John Fitzgerald

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Posted 09 June 2020 - 10:38 AM

I got no bites on a 6mm Radian anywhere.  Ordered the 6mm Delos from our sponsor.  I will be posting on how well it works on double stars in that forum.  I'm not that far from Astronomics, so it won't take long in transit.


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#28 csrlice12

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Posted 10 June 2020 - 10:58 AM

Unless it gets held up in Oklahoma customs...then it gets rerouted thru Montreal, New York, Los Angeles, and a Lagrange point.wink.gif


Edited by csrlice12, 10 June 2020 - 10:58 AM.

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#29 John Fitzgerald

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Posted 10 June 2020 - 11:02 AM

Unless it gets held up in Oklahoma customs...then it gets rerouted thru Montreal, New York, Los Angeles, and a Lagrange point.wink.gif

It's already out for delivery.  Fedex is frequently one day to here from OKC, despite saying two day.

 

Edit: In just one day, it went from OKC to Memphis, back to Tulsa, then to Springdale, AR.....strange.


Edited by John Fitzgerald, 10 June 2020 - 11:05 AM.


#30 jakecru

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Posted 10 June 2020 - 11:32 AM

Nothing against the DeLite, but 5 XW 6 Delos 7 XW may make a bit more sense to keep the field of view and weight of the other eyepieces similar. All of these are excellent glass. 



#31 John Fitzgerald

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Posted 10 June 2020 - 11:55 AM

Nothing against the DeLite, but 5 XW 6 Delos 7 XW may make a bit more sense to keep the field of view and weight of the other eyepieces similar. All of these are excellent glass. 

I have a heavy brass TV 2" to 1.25 adapter I use to keep 1.25 eps and 2" eps closer to balance.  The scope is so big and heavy anyway, that I don't notice a difference when switching between the 7 Delite and 5 XW.  I don't have the 7 XW.  I thought about it, but bought the Delite instead.  With the addition of the Delos, I will have a premium 1.25" lineup in the shorter focal lengths consisting of 15 Delite, 13 LVW, 10 XW, 8.8 ES 82, 7 Delite, 6 Delos, 5 XW, 4 WO UWAN 82.  With seeing here, I can very rarely use the 4mm at 304x.  I can go higher if necessary with a 2x-2" focal extender


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#32 Starman1

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Posted 10 June 2020 - 04:17 PM

The % difference grows larger as the focal lengths shrink.

Say I want to maintain a constant 70x between focal lengths, which reduces the % difference as you go up, which is just what you need to combat seeing.

If I use my 12.5" as the model, the focal lengths of eyepieces are (rounded to 0.1mm):

26.1mm, 13.0mm, 8.7mm, 6.5mm, 5.2mm, 4.3mm, 3.7mm, 3.3mm, 2.9mm

As you can see, of the 9 eyepieces, 6 are within 3.6mm of focal length.

As I see it, it is very rational to bunch up the focal lengths at high power, as John has done.


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#33 John Fitzgerald

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Posted 10 June 2020 - 06:25 PM

Received 6mm Delos in good order this afternoon.  Thanks, Astronomics!

 

I will post a short review as to how it performs on double stars if I get to view tonight.

 

Edit: I did get to view.  It was clear and transparent, with mediocre to moderate and variable seeing.  These are only first impressions:

 

The Delos is fairly big and heavy.  A bit larger and heavier than a 5mm Pentax XW.  The seeing was mediocre, but the Delos gave good double star views, and the wide field (72 deg published) makes finding things easier than with most common 6mm eyepieces.

Eye placement was a bit trickier for me than for the Delite, but I quickly became used to it as I observed many doubles with my 6" f/8 apo. 

 

As expected, views are almost as sharp near the edges of the field as in the center.  Contrast is great, colors seem fairly cool, not as warm as the Radians give, but about the same rendition as the Delites.


Edited by John Fitzgerald, 11 June 2020 - 09:01 AM.

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#34 John Fitzgerald

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Posted 13 June 2020 - 08:21 AM

After another night with slightly better seeing, the 6mm Delos is great.  I think I the 7mm Delite is easier to look through, as to eye placement. 


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#35 Kunama

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Posted 13 June 2020 - 04:36 PM

After another night with slightly better seeing, the 6mm Delos is great.  I think I the 7mm Delite is easier to look through, as to eye placement. 

I find eye placement with Delos becomes a non-issue once the eyeguard is extended to the right height, but that might take a few tries.  A very nice eyepiece.  I have the full set of the Delos, and wish they made a 27mm one as well....



#36 Starman1

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Posted 13 June 2020 - 05:08 PM

I find eye placement with Delos becomes a non-issue once the eyeguard is extended to the right height, but that might take a few tries.  A very nice eyepiece.  I have the full set of the Delos, and wish they made a 27mm one as well....

The 27mm Panoptic is a fine eyepiece, and has 19mm of eye relief.  I'm just sayin'.....


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#37 Kunama

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Posted 13 June 2020 - 05:31 PM

The 27mm Panoptic is a fine eyepiece, and has 19mm of eye relief.  I'm just sayin'.....

Yes it is, I am ordering one at the moment.  


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#38 Swamp Fox

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Posted 14 June 2020 - 10:13 AM

The 27mm Panoptic is a fine eyepiece, and has 19mm of eye relief.  I'm just sayin'.....

When I had to move from the Ethos line due to worsening astigmatism, I kept my 27mm Pan for that very reason. It complements my Delos and DeLite eyepieces, and I have no issues observing with it while wearing glasses.

 

Mark



#39 RLK1

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Posted 16 June 2020 - 11:31 AM

I don't see any votes for the 6.7mm ES 82 and I've used one for a couple of years now in my 16" F4.5 dob with a paracorr and find the planetary viewing of Jupiter and Saturn to be quite good. It has ample eye relief for me since I don't wear glasses and the stated spec is 15.7mm. The reviews from amateurs on various vendor sites are very good. It's worth considering...


Edited by RLK1, 16 June 2020 - 01:28 PM.


#40 John Fitzgerald

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Posted 16 June 2020 - 02:44 PM

The 6.7 is a very good  eyepiece.  I did not consider it because I already had a 7mm.  Too close in focal length. 




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