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Bob, honestly I do not know the 125mm Pentax (although I read some good things about it especially for wide field medium format shooting: this is another scope few people own anyway.), but I seriously hope that the performance is better than the other Pentax I've seen... They are just horrible in the blue! I don't know why so few people notice that. Even if you can of course eliminate it, makes one think about using the word APO for them.

What about a flattener for the 130? What did you use?
What are the differences you mention in the lens cells? Are they both collimatable?

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Some of the Pentax scopes will show a hint of flase color from what I have also seen. The older ones seem to be a bit worse than the new ones. The trade off is the ability to completely cover a 4X6 format camera with an almost perfectly flat field. Most imagers would rather fight with a bit of spurious color than to have to deal with a badly curved field.

I didn't test any flatteners with the 130 as the 2 cameras I used with it (Modified 20D and a MONO ST2000) showed almost no curvature with that size chip If you hunt around you'll also find that a high quality flattener for scopes of the 130 size and up can get VERY expensive. Some of them can cost as much as 1/4 the price of a 130 itself. I have heard of one gentleman using the flattener for the TMB 152 with success but thats a $1000 flattener. Another has tried the TAK 130 unit also. You may be able to use the TV piece for 800-1000mm scopes but this will seriously vignette a full frame camera. Unless your using a large chip CCD or full frame DSLR there is really no need for it based on the images I have seen and taken.

Now back to the 111.

CS's

CS's