1. Using a DSLR to Study Variable Stars

2. Canon 450D - linear over a magnitude using RAW images with a specific setting

3. Canon 85 mm fixed lens- can be used to do precise estimates down to magnitude 8 ( undriven ).

4. Canon 200 mm fixed lens- can be used to do precise estimates down to magnitude 10 ( undriven ).

8. Precision Photometry Eye: +/- 0.1 m Standard DSLR Photometry: +/- 0.03m Precise DSLR Photometry: +/- 0.01m

9. Precision Photometry The right settings for the right signal to noise ratio (SNR -100)

10. Precision Photometry Epsilon Aurigae & 85 mm lens: Exposure 5 secs,ISO 200, f5 Exposure 5 secs, ISO 200, f4.5 Exposure 5 secs:ISO 200. f4.

11. Precision Photometry Centered target stars The effect of wind Remote Switch Careful Focus Long Exposure Dark Frames

12. Standard DSLR Photometry +/- 0.03m ten images analysed

13. 200 mm lens - exposure 3.2 secs, f2.8, ISO 800 images every ten/fifteen minutes

14. 85 mm lens, exp 5 secs, f3.5, ISO 800

15. 200 mm lens - exposure 2.5 secs, f2.8, ISO 800

17. Variations of 0.2/0.3 magnitude - a new world of variables

18. Precision DSLR Photometry +/- 0.01m thirty/ fifty images analysed

21. Estimates of the 20/2/10 JD: 2455248.367 Camera Settings with an 85 mm lens: Exposure-5 seconds, ISO 200, f4. 5 sets of ten images: Analysed with AIP4WIN v2.1.10 (1) 3.776V (2) 3.777V (3) 3.774V (4) 3.769V (5) 3.781V Average = 3.775V Standard Deviation = 0.004

22. AIP4WIN - analysis of RAW images

23. Dark frames Flat Fields

24. Multi-image deep sky stacking procedure - 30 minutes to analyse 50 images

25. V Photometry Green Channel Images Transformation Co-efficient

26. Estimates of the 10/3/10 JD: 2455266.327 Camera Settings with an 85 mm lens: Exposure-5 seconds, ISO 200, f4. 5 sets of ten images: Analysed with AIP4WIN v2.1.10 (1) 3.769V (2) 3.760V (3) 3.776V (4) 3.764V (5) 3.758V Average = 3.765V Standard Deviation = 0.007

27. Deciphering Epsilon Aurigae

28. Presentation of estimates

29. DSLR Cameras - not as sensitive as CCD cameras because they are not cooled - but yield just as good results down to mag 10.5 desloughney@blueyonder.co.uk