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Quick test - Radian 6 vs Pentax XL 7

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#1 Apnee44

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Posted 29 January 2023 - 09:17 AM

Few months ago I was looking for a good planetary eyepiece having a focal length between 7mm and 6mm, having a 20mm eye relief and not exceeding 160 euro. First, I found the Radian 6. I was very impressed, especially on Jupiter. Few days ago I could finally get the Pentax XL 7 and get two nice nights to compare both on my Dobson 200 (f6).

 

My conclusion between the Pentax XL 7 and the Radian 6 is the following, the Pentax XL 7 is neutral in color, which the Radian 6 is far from being… On the moon, no discussion possible, I much prefer the Pentax.

On Jupiter, I would say the two are almost complementary.  To easily highlight the different bands of clouds, the 6 is really effective.  On the other hand, the 7 is more effective on subtle details.  Example, a moon passing in front of Jupiter, passing really right on the edge, Friday night was obvious at first glance in the Pentax, not in the 6.

On Mars both were beaten by the Meade 4000 UWA 4.7 which I just received 😁….  But to choose between the Pentax 7 or the Radian 6, I would say the Pentax because it gives an absolutely black sky background (it's even confusing at first).

For the deep sky, the Pentax is obviously the winner because of its neutrality and the absolutely black sky background.

So, if some hesitate between the two, the second-hand price being equivalent, I would recommend the Pentax… for those who can, take both 🙂

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Edited by Apnee44, 30 January 2023 - 01:26 AM.

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#2 bulletdodger

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Posted 29 January 2023 - 10:42 AM

Enjoyed eval! Love my Radians and will have to add a Pentax or 3 to my collection. Congrats on the 4.7. Very hard to find the JOC produced ones. Axiom LX are same quality but only went to 7mm in FL. Love my later 5.5 WP UWA.

#3 25585

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Posted 29 January 2023 - 12:00 PM

I prefer the XL 7 over both the ranting.gif Radian and the XW 7. But my Morpheus 6.5mm is favourite.


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#4 Mike B

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Posted 29 January 2023 - 05:18 PM

 

… for those who can, take both

We can see that you’ll be a welcome addition around here! gve.gif



#5 RLK1

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Posted 29 January 2023 - 06:17 PM

What scope is the OP using for his comparo?



#6 JeremySh

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Posted 29 January 2023 - 09:38 PM

I prefer the XL 7 over both the ranting.gif Radian and the XW 7. But my Morpheus 6.5mm is favourite.

Glad you like your XL7, Richard.
It seems the Radians grow on one, so perhaps you will come around…..



#7 PJBilotta

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Posted 29 January 2023 - 10:41 PM

Very nice review! I did mine several years ago with the 7XL against an 8mm Radian and had the same reaction. I really think the 7XL is one of the best of its focal range ever made - better than the current 7XW, though the 6.5 Morpheus is just as good.

#8 Mike B

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Posted 29 January 2023 - 11:13 PM

Very nice review! I did mine several years ago with the 7XL against an 8mm Radian and had the same reaction. I really think the 7XL is one of the best of its focal range ever made - better than the current 7XW, though the 6.5 Morpheus is just as good.

Hard to imagine that, as I really like my 7XW! Back in the day I had 10.5 & 14XLs and wasn’t that crazy for ‘em.



#9 25585

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Posted 30 January 2023 - 08:52 AM

Glad you like your XL7, Richard.
It seems the Radians grow on one, so perhaps you will come around…..

ohlord.gif



#10 Kutno

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Posted 30 January 2023 - 12:20 PM

Very nice review! I did mine several years ago with the 7XL against an 8mm Radian and had the same reaction. I really think the 7XL is one of the best of its focal range ever made - better than the current 7XW, though the 6.5 Morpheus is just as good.

 

The 7mm Pentax XL is indeed an excellent eyepiece.  My comparison of a 7mm XL and an 8mm Radian, though, did help me thin a herd of 20mm eye relief eyepieces I had some years ago.  The performance of my 7mm Nagler Type 1, an even focal length competitor, and that of the Radian during the comparison, permitted me to sell the XL.  So did becoming more enamored of binoviewing.      


Edited by Kutno, 30 January 2023 - 12:24 PM.

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