Telescope Reviews: Best dslr

What you said technically is absolutely correct. That is absolutely true that increasing ISO past the point you referred to as “unity gain” will decrease dynamic range and increase noise excessively. However, the stacking process in the GH3 reduces the noise significantly.

In addition that mode can compress the dynamic range of the scene by up to 6 stops. Now this isn’t a true 6 stop gain in dynamic range. It is a software solution that basically compresses the scenes dynamic range for up to 6 stops. It is not the ideal method. However, it is very affective when you have limitations on the shutter durations you can use.

And that is where you neglected to factor in every parameter that matters. In a perfect world cost is no issue so you can say that everyone should guide, and buy a rock solid mount, and have a fully corrected large scope.

In reality we have budgets and in order to stay in those budgets we have to make compromises. In this situation shutter duration is going to be his biggest limitation. He simply isn’t going to be able to track for very long without buying an entirely new setup.

The GH3 can give him a solution that will work with his current setup. It can do clean images at ISO 25,600 in seconds instead of minutes or stacks that take hours. Now they are not going to equal those hour long images because of the losses you mentioned. However, if he can get to 80%-90% of those images in 1/3rd the cost I would consider that a wise purchase.

The biggest issue right now is that most people in AP won’t dare to step outside the box and try something entirely different than what they are accustomed too. They stick with what they have been using for years and don’t dare to try an entirely new approach.

The solutions I recommended are not the best all-around solutions. They have many limitations. However, for his specific situation that is about the only thing in his budget that is going to give him the ability to do good solar system objects along with good DSO images without changing his mount and perhaps scope.

Although your technical explanation was correct it really isn’t helpful for his situation. If he tries to achieve the ideal parameters that you recommend with his current equipment he isn’t going to be satisfied with the results. In addition, buying new equipment may or may not fit within his budget.

All I did was recommend two solutions that could work within his budget. The GH3 could work with his current equipment and the G3 is cheap enough where he could buy a new mount and scope and still stay within his budget(Although a T2i would probably fit that scenario just as well).

I didn’t see any recommendations from you that would help him at all.

Edited by mpgxsvcd (01/22/13 09:16 AM)

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