A few UV/IR Pics

[Thalestris24]

Have taken a few subs using a full-spectrum 1100d and Takumar f4/200mm fitted with a B+W 403 filter, over the last month or so. Although the filter is sold as a uv pass photographic filter it also passes some near ir. Baader do a better, almost narrowband, uv pass filter but it costs way too much! One of these days I might get a filter that blocks the ir but it looks like they have to be shipped from the States. They aren't too expensive but I dislike having to pay $18 shipping just for a filter...

M45 - 7 x 300s cropped and resized to 40pc The main stars must radiate a lot of uv...

 

6Gem/M35 4x600s resized to 30pc of the original Clearly no Monkey Head or Jellyfish visible!

 

 

Aldeberan 26x120s cropped

 

 

M44 13x300s cropped and resized to 30pc

 

Only Aldeberan includes darks along with the flats and bias frames. I used old flats (not taken with the filter) which is probably why they all seem uneven - I should probably take some fresh! Still, I was quite pleased with what I managed to get, and the filter reduces lp better than even a Baader 7nm Ha. Of course, zero nebulousity with this setup but you can't have everything!

Louise

 

 

[Herra Kuulapaa]

CMOS sensor is generally more sensitive to NIR (~750nm) than UVA (~350nm) and it may be that most of the signal in your images is in fact NIR.

[Thalestris24]

3 hours ago, Herra Kuulapaa said:

CMOS sensor is generally more sensitive to NIR (~750nm) than UVA (~350nm) and it may be that most of the signal in your images is in fact NIR.

Yeah, I'll probably have get an ir-blocking and/or uv-blocking filter in order to distinguish  I could try a standard uv-blocking photo filter but I don't know how much near-ir it passes. So far this year the weather here has been awful  No chance of trying anything for the next week, at least.

Louise

[Herra Kuulapaa]

I've noticed it takes quite strong IR suppression to dig that UV signal visible.

I'm using the UG1, which is a di band filter:

 

But when combined with the 2mm S8612 it cuts all the NIR away.

 

[Thalestris24]

5 hours ago, Herra Kuulapaa said:

I've noticed it takes quite strong IR suppression to dig that UV signal visible.

I'm using the UG1, which is a di band filter:

But when combined with the 2mm S8612 it cuts all the NIR away.

 

Hi

Yeah, I was thinking of getting the S8612 (mentioned above) but they are quite pricey and only seem to be available from the usa...