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Lumicon Premium + vs. Newer Lumicon?

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#1 junomike

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Posted 24 March 2012 - 05:39 PM

Has the Lumicon Filters changed any in regards to the Transmission %? I have an older "Premium +" OIII and I'm wondering If the newer (non-rated) version is going to be better? Worse? The same?
Also, when did Lumicon do away with the Percentage Ratings?

Mike

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#2 John K

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Posted 24 March 2012 - 06:10 PM

My new ones that don't say premium have higher transmission ratings. :shrug:

#3 nevy

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Posted 24 March 2012 - 06:21 PM

My new ones that don't say premium have higher transmission ratings. :shrug:

So does mine , the best views I had of the veil was through the premium in a 13 mm eyepiece , ( loads of fine filaments) my 2" non premium has higher transmission figures I have not tested it at high power yet , I'm waiting for Cygnus to come round to try it

#4 PJ Anway

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Posted 24 March 2012 - 06:42 PM

Here is the case for my OIII purchased in 1990:

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#5 junomike

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Posted 24 March 2012 - 06:51 PM

My new ones that don't say premium have higher transmission ratings.



So then they (Lumicon) still mark them with % ratings?


Mike

#6 John K

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Posted 24 March 2012 - 09:39 PM

Here is a shot of my 2" O-III from last December.

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#7 Starman1

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Posted 25 March 2012 - 12:45 AM

Lumicon has not done away with the testing of each filter, and earlier O-III filters transmitted red as well as the O-III wavelengths--new ones don't.
Newer filters usually have higher transmissions also.

#8 nevy

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Posted 25 March 2012 - 07:14 AM

Here is a photo of mine,
http://i1172.photobu...nev19/image.jpg

#9 junomike

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Posted 25 March 2012 - 10:45 AM

Excellent answers guys! I'm quite pleased to hear they still test each Filter and label the results.

So with the absence of "Red", but slightly higher Transmission percentages, would there be a big difference between the older Premium + and the newer Lumicon?

Mike

#10 Starman1

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Posted 25 March 2012 - 11:18 AM

Not in the useful bandwidth. But here is one caveat:
In the daytime, look through the filter with the bright sky in the background. If you see what appears to be a roughly circular stain near the outer edge of the filter, this could indicate a failure of the coatings.
This happened on some of the filters from before 2001.
It doesn't seem to affect the center of the field, but the edges become more questionable.

#11 junomike

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Posted 27 March 2012 - 02:03 PM

Don, I checked and my OIII P+ has consistent uniform coatings from center to edge. Guess the difference wouldn't be worth the cost to upgrade?

Mike

#12 Starman1

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Posted 27 March 2012 - 04:29 PM

Nah. Use it till it dies.

#13 jsiska

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Posted 28 March 2012 - 03:51 PM

Here is a photo of my O-III case showing the Nebula Line Transmission. The Lumicon invoice date for this filter was 07/01/94.

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#14 David Knisely

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Posted 28 March 2012 - 04:34 PM

First, a little history. When Lumicon first started marketing filters way back in the early 1980's, they had two quality levels: regular and Premium. The premium units were sort of "the pick of the litter", as they tended to have slightly higher maximum transmission levels and a bit more consistent passband locations than the regular filters did. Eventually, the demand for the premium units and better quality control contributed to a phase out of offering the regular units, although some may still have been offered as "seconds". Lumicon went out of business in 2002, but was resurrected by Parks, and the two-tier quality system for filters never has resurfaced. I still have my old "premium" 1.25" set of Deep-sky, UHC, OIII, and H-Beta filters, and their transmission characteristics are pretty close to those that I see in my newer 2" models. The only exception is my 1986 vintage 1.25" Lumicon premium OIII filter, as it has a "red leak" secondary passband that my much newer Lumicon 2" OIII does not. Clear skies to you.

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#15 junomike

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Posted 28 March 2012 - 04:48 PM

Thanks for the history lesson - very Interesting!

Mike

#16 jsiska

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Posted 28 March 2012 - 05:32 PM

David,

Thank you.

#17 mclewis1

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Posted 28 March 2012 - 09:41 PM

2003 era Lumicon filters, Deep Sky on the left, OIII on the right.

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#18 Starman1

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Posted 29 March 2012 - 12:16 AM

2005 era Lumicon filters, Deep Sky on the left, OIII on the right.

The one on the right is a UHC filter. The O-III has no H-Beta transmission.

#19 mclewis1

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Posted 29 March 2012 - 11:07 AM

Don,

Thanks, That's what I always thought ... but take a look at the silver labels. I'm guessing this is a labeling or packaging error (putting an OIII label on a box containing a UHC filter and report).

At the time of the purchase I didn't know any better, but later on I thought that this particular OIII filter performed "strangely" (didn't seem to highlight planetaries the way I thought it should using the blinking method), but I just chalked it up to the transition era Lumicon filters. In checking my receipts I also found that the two filters shown above were actually purchased in 2003, not 2005. They were purchased directly from the Lumicon ecom website.

I also have a Lumicon 2" OIII filter purchased in 2007 around here, and one of these days I'm going to compare it with the older one. This newer filter performs as I would expect an OIII to, it's also the one I have the most experience with.

#20 MadHungarian

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Posted 05 May 2014 - 09:53 PM

Resurrecting this thread, to ask a (perhaps silly) question.

My brand-new Lumicon OIII filter just showed up, and has somewhat disappointing transmission% of 91.5% and 91.2%. This is the lowest i've seen on any of my Lumicon filters. Would you consider this to be an acceptable percentage?

#21 David Knisely

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Posted 06 May 2014 - 12:29 AM

Resurrecting this thread, to ask a (perhaps silly) question.

My brand-new Lumicon OIII filter just showed up, and has somewhat disappointing transmission% of 91.5% and 91.2%. This is the lowest i've seen on any of my Lumicon filters. Would you consider this to be an acceptable percentage?


Yes, this is *more* than acceptable transmission. The human eye has difficulty judging differences in light intensity of less than nine percent, so any transmission level above 89% at the correct wavelengths would offer reasonably good nebula filter performance. It is the rejection of the background skyglow that is most important here, and for that, the Lumicon filters are quite good. Clear skies to you.

#22 Allan Wade

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Posted 06 May 2014 - 09:22 AM

I did some research and became aware of the range of transmission levels that Lumicon filters are available.

A very helpful person here on CN hand picked some Lumicon filters for me and they are in the 96% to 97% range.

As David suggests, it is beyond the ability of the eye to detect the small difference in transmission levels. But having said that, I have now sold the OIII and narrow band filters I compared to my new Lumicon ones, because the Lumicon filters displayed a brighter image while still having similar or better contrast.

#23 MadHungarian

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Posted 06 May 2014 - 04:31 PM

Thanks all. I might try ordering another one at some point and then keep the best of the two.

#24 Gil V

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Posted 06 May 2014 - 09:26 PM

This thread reminds me of the "bench testing" forum in the Cats & Casses category, only it's more interesting and more informative.

For the record, my Lumicon has 97.0, 95.7, 95.1 transmission %, and also exhibits the circular ring around the edge that indicates failure of the coating. It is visible when looking at the filter, but not when looking through the filter (possible reflection artifact?).

It works fabulously, though, and has revolutionized my deep-sky viewing. Bought it used off E-bay, and I don't regret buying it for a second.






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