Brent, thanks for the great write-up; this is really helpful in understanding the concept. Please see if you can help clarify some terminology confusion:
One of your fellow professional DSLR modifier offers these mod options:
•Option 1 - IR Filter Removal Only
•Option 2 - IR Filter Replacement with Clear Glass
•Option 3A - IR Filter Replacement with Astrodon UV/IR block filter
•Option 3B - IR Filter Replacement with Baader UV/IR block filter
Does ‘IR Filter’ above refer to LPF-2 (WB filter)? If yes, why there is so much disparity in referring to same components among professionals? My concern being it adds more confusion than clarity for something that is really 'simple' if terminology was standard. After all we are talking two layers/filters, how complicated could it be; would you agree? Sorry, just little frustrated at terminology jargon, nothing against you or anyone else.
Wouldn't following make more sense?
•Option 1 - LPF-2 Filter Removal Only
•Option 2 - LPF-2 Filter Replacement with Clear Glass
•Option 3A - LPF-2 Filter Replacement with Astrodon UV/IR block filter
•Option 3B - LPF-2 Filter Replacement with Baader UV/IR block filter
Yep!! this is one of the reasons for a lot of the confusion!
However, Hap's pricing models there show the options for ALL models, including the older models that DO require an IR Filter replacement, mainly the 20D/30D/300D/350D/etc...so, as to not confuse his customers, I would think that this is why he words things this way...****AFAIK! I cannot speak for him/anyone else!****
There is always confusion in terminology when something is first 'discovered'/brought to attention/debated,etc..
But, with only a VERY small group of guys doing this, and having it split right down the middle(AFAIK, there are several international modification companies that share my exact opinions/ideas..Hap and Gary are the only two, AFAIK, that still hold to the OLD truths that WERE relevant to older models!)
Maybe it is an age thing...? I am "only" 30, so perhaps I am not as set in my ways and unwilling to change as "others" lol (I AM NOT laughing at anyone, or poking fun, or saying ANYthing negative about anyone! atleast not intentionally!)
If you were to ask "them" if you needed an AstroDon or Baader filter to replace LPF-2, they would undoubtedly say YES!
Again..my points are still valid. whether people, or even 'them', believe me or not.
I will not even go into the "proven test" performed by one of those guys that shows LPF-1 does not block enough IR for "proper" astro images. THat test is so flawed it really isnt even funny, and a LOT of people use that as definitive "proof" that one needs an IR replacement for LPF-2.
Things like this prove otherwise!
This is a ***REAL*** test!
REALLY look at the sets of images, particularly the top row of images. Look at the Stock 1000D image, this shows a stock camera not allowing ANY IR data through..the images next to it, the ones of a Baader filter and an LPF-1 only system, guess what? THEY ARE IDENTICAL(to each other, not compared to the stock 1000D image)!!!!
So...since BOTH the Baader AND LPF-1 only images show the exact same amount of IR data in the image, what does this mean?
It means that NO MATTER WHAT MOD you do, assuming an IR Block is LEFT INTACT and LPF-2 is removed, you will have the EXACT same performance.
My guess is that the small amount of IR data(compared to the Full Spectrum 350D image and the stock 1000D image) that still transmits through is of no consequence to our pursuits..
Also, if you look at the images below those that show the remote's IR LED, you will see that by just adding a WB filter(in this exact case the X-Nite CC1 filter from MaxMax), there is ZERO IR data passed....which means, YES, LPF-2 or any WB filter DOES block some IR, which is a result of their spectral curve modification/restrictions..the return a camera back to stock..they remove all deep red(Ha) data....But the point/my main point is, and always has been, that the "bad" filter, LPF-2 has to be removed (this is universal no matter who you ask), whether you use ONLY LPF-1 or an expensive alternative, you get the EXACT same performance!!
That is my whole point. Why waste the $ on an expensive filter if LPF-1 does the EXACT same job/amount of "work" as the expensive filters..?
All of my tests are DIRECTLY in line with this test above, and NOT Gary's!!
Though I have only tested on TRUE IR light sources, not flashlights(like Gary), or a stove burner(like the one above)..
Only with REAL IR sources can you judge a modified system's performance..
And there is very little to debate..
I need to make a write-up very soon to help squash some of this confusion..
I cannot wait til I have some time to finish my website, I would hope that it would help a lot of people see what is going on inside these cameras, and how we can manipulate things to get the desired output..
If I only had SOME spare time!
And yes, a lot of confusion would be gone if we could all agree on the same terminology..
I will be the first to admit if/when I am wrong..so all anyone has to do is prove to me that I am, I will change my opinions/advice..
But from everything I have ever seen online, and from ALL of my experience, everything I have said reads 100% true in my head..AND MANY, MANY customer's as well!