Hi
Shot the Rosette with Berts 300mm f2.8 flourite lens last night.
3x10 mins iso400, Idas uv/ir and Baader uhc-s filters. Modded 350D, processed in Iris and Photoshop. Noiseware used. Hand guided on the same "Sampson" mount as used for my 10 inch scope. Larger version here.
Its a joy using this lens, even under light polluted skies, the red nebulosity readily appears even on the original images with the help of the uhcs filter, the fast lens works great with the filter.
Scott
Really nice bright detailed image of the Rosette Scott. It would be interesting to see what you could do with a cooled camera and the 300mm lens. I bet you could get some really faint stuff without noise masking it.
hOughy I am sure if you asked Scott very nicely, he might let you put tHe lens on your new cooled camera.
If you think about it 10 mins exposure on tHe lens is the same as about 90 mins on a 100ED or SCT for extended objects such as nebulae.
hOughy I am sure if you asked Scott very nicely, he might let you put tHe lens on your new cooled camera.
If you think about it 10 mins exposure on tHe lens is the same as about 90 mins on a 100ED or SCT for extended objects such as nebulae.
Hi all
Yep no problem, Id be keen to see what result we get too, though to get the very best might need to go to a darker site, like Kulnura, on one of Houghy's portable rig
Scott
Thanks all
Jim, I got close with the viewfinder on a bright star, then took 10 second long test images @ISO 1600 set to Jpeg Large. I would zoom in, check smallest star sizes, atler focus slightly in one direction, then take another, if stars bigger fo twice as far the other way, if smaller go the same amount the same way, then take another, within 5 or so images Id get sharp pinpoint faint stars, Id then change to RAW ISO400 and take the images.
Scott
Hi Scott,
O.K. thanks for that bit of information, thats basically what DSLR Focus does, Ive aquired a couple of ED glass Nikon lenses and had a bit of a go with them but waiting for a clear sky to do more (its been overcast since 15th of Jan.) one is a 70-300mm the other a wide angle (for the milky way) 18-55mm (with an adaptor to Canon 300D) I found focus very difficult on the 18-55 lens using Sirius to focus on, so ill give DSLR Focus a go when the sky clears, do you stop down that 300mm lens from the F-2.8 setting????.
